True/False
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1.
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In a chemical reaction, the total mass of the reactants is greater than the total mass of the products.
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2.
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The modern periodic table is organized according to atomic mass.
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3.
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The elements in each family of the periodic table generally have the same number of valence electrons.
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4.
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The most chemically reactive metals are in Group 1 of the periodic table, known as Alkali Metals.
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5.
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The bubbling that occurs when alka-seltzer tablets are dropped into water is due to a chemical reaction between aspirin (the medication) and baking soda (a base) contained in the tablets.
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6.
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Elements in the halogen family -- fluorine (9), chlorine (17), bromine (35), etc. -- gain 2 electrons when they react.
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7.
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The materials present at the beginning of a chemical reaction (the left-hand side) are called the products.
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8.
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In several of our chemistry demonstrations universal indicator was used to reveal a pH change in chemical reactions. The universal indicator is a catalyst for these reactions.
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9.
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Elements in Group 18 of the periodic table, known as Noble Gases, have a full outer shell of electrons.
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10.
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A color change when red dye is added to water is an indication that a chemical reaction has taken place.
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11.
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Bubbling in Sprite is an indication that a chemical reaction has taken place.
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12.
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The color change that occurred when vinegar was added to milk of magnesia and universal indicator is an indication that a chemical change was taking place.
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Multiple Choice
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13.
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Which term describes a liquid changing into a solid?
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a.
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freezing
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b.
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melting
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c.
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vaporizing
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d.
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condensing
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14.
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Elements such as Li (3), Na (11), & K (19) in column #1 are called Alkali Metals and have.....
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a.
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1 valence electron.
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b.
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2 valence electrons.
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c.
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7 valence electrons.
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d.
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a full outer shell.
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15.
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Elements such as Be (4), Mg (12), & Ca (20) in column #2 are called Alkali Earth Metals and have.....
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a.
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1 valence electron.
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b.
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2 valence electrons.
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c.
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7 valence electrons.
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d.
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a full outer shell.
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16.
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Elements such as F (9), Cl (17), & Br (35) in column #17 are called Halogens and have.....
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a.
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1 valence electron.
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b.
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2 valence electrons.
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c.
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7 valence electrons.
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d.
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a full outer shell.
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17.
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Elements such as He (2), Ne (10), & Ar (18) in column #18 are called Noble Gases and have.....
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a.
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1 valence electron.
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b.
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2 valence electrons.
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c.
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7 valence electrons.
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d.
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a full outer shell.
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18.
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Which process involves a gas changing into a liquid?
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a.
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melting
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b.
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freezing
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c.
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vaporization
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d.
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condensation
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19.
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Which of these particles has a positive charge?
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a.
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atom
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b.
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proton
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c.
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neutron
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d.
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electron
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20.
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Which of these particles has a negative charge?
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a.
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atom
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b.
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proton
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c.
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neutron
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d.
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electron
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21.
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Electrons involved in bonding between atoms are
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a.
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valence electrons.
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b.
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inside the nucleus.
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c.
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closest to the nucleus.
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d.
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positively charged.
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22.
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What is the greatest number of valence electrons an atom can have in its outer most shell?
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23.
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What information in the periodic table indicates the number of protons in an atom?
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a.
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the position of the element in its column
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c.
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the elements atomic number
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b.
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the elements chemical symbol
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d.
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the elements atomic mass
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24.
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From an elements location in the periodic table, you can predict its .....
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a.
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properties.
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b.
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chemical name.
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c.
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chemical symbol.
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d.
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discovery date.
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25.
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Sodium can react with chlorine to form
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a.
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a diatomic molecule.
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b.
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a halogen.
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c.
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a noble gas.
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d.
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table salt.
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26.
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Fluorine, Chlorine, Bromine, and Iodine are part of a family called
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a.
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noble gases.
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b.
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metalloids.
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c.
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halogens.
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d.
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alkali metals.
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27.
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Hydrogen, Lithium, Sodium, & Potassium are part of a family called
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a.
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noble gases.
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b.
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alkali earth metals.
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c.
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halogens.
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d.
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alkali metals.
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28.
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Helium, Neon, Argon, & Krypton are part of a family called
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a.
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noble gases.
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b.
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alkali earth metals.
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c.
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halogens.
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d.
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alkali metals.
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29.
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Beryllium, Magnesium, Calcium, & Strontium are part of a family called
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a.
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noble gases.
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b.
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alkali earth metals.
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c.
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halogens.
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d.
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transition metals.
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30.
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Copper, Silver, and Gold are part of a family called
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a.
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noble gases.
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b.
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alkali earth metals.
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c.
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transition metals.
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d.
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alkali metals.
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31.
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What is the chemical name for the compound with the formula Na2S?
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a.
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sodium fluoride
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b.
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magnesium sulfide
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c.
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lithium oxide
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d.
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sodium sulfide
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32.
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In a chemical reaction
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a.
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there is no change in energy.
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c.
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energy is always released.
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b.
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energy is always absorbed.
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d.
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energy is either absorbed or released.
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33.
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Water vapor in the air turns to liquid water in the form of rain. This is an example of a
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a.
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physical change.
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b.
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chemical change.
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c.
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chemical equation.
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d.
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chemical formula.
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34.
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The only sure evidence of a chemical reaction is
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a.
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bubbling or fizzing.
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c.
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the creation of a new material.
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b.
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a color change.
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d.
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a pH change
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35.
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A shorter, easier way to show chemical reactions, using symbols instead of words, is called a
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a.
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chemical equation.
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b.
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chemical formula.
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c.
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symbol.
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d.
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subscript.
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36.
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The substances listed on the left side of a chemical equation are the
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a.
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products.
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b.
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coefficients.
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c.
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precipitates.
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d.
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reactants.
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37.
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In chemical reactions, what does the principle of conservation of mass mean?
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a.
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Matter is not created or destroyed.
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b.
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The total mass of the reactants is greater than the total mass of the products.
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c.
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The total mass of the reactants is less than the total mass of the products.
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d.
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Matter is not changed.
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38.
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Look at each of the following reactions. (Three of them are balanced incorrrectly.) Which of the following shows a correctly balanced chemical equation?
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a.
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H2O2 ® H2O + O2
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c.
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SO2 + O2 + 2 H2O ® 4 H2SO4
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b.
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2 Fe2O3 + 3 C ® 4 Fe + 3 CO2
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d.
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2 Mg + HCl ® MgCl2 + H2
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39.
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Which of the following does NOT illustrate a chemical change?
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a.
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a candle burning
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b.
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alka-seltzer in water
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c.
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baking soda+vinegar
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d.
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red dye in water
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40.
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A bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a _____________ reaction.
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a.
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synthesis
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b.
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decomposition
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c.
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replacement
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d.
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precipitate
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41.
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The chemical reaction between copper oxide and carbon that produces copper and carbon dioxide (CuO + C ® Cu + CO2) is an example of
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a.
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synthesis.
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b.
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decomposition.
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c.
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precipitation.
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d.
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replacement.
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42.
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The minimum amount of energy that has to be added to start a reaction is known as the
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a.
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exothermic energy.
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b.
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endothermic energy.
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c.
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activation energy.
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d.
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chemical energy.
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43.
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Chemicals that act as biological catalysts by speeding up reactions in living things are called
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a.
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inhibitors.
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b.
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enzymes.
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c.
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fuels.
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d.
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reactants.
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44.
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A material used to decrease the rate of a chemical reaction is called a(n)
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a.
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inhibitor.
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b.
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catalyst.
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c.
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enzyme.
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d.
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fuel.
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45.
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Which of these is NOT one of the three (3) things necessary to start and maintain a fire?
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a.
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fuel
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b.
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oxygen
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c.
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carbon dioxide
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d.
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heat
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46.
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A rapid reaction between oxygen and a fuel is known as
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a.
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combustion.
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b.
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heat.
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c.
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activation.
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d.
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decomposition.
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47.
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In what way can a fire be brought under control?
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a.
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Add fuel.
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b.
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Add O2.
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c.
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Remove O2.
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d.
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Remove CO2.
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48.
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The small numbers to the lower right of chemical symbols (as in O2) are called
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a.
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exponents
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b.
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subscripts
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c.
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coefficients
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d.
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none of these
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49.
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The large numbers in front of chemical formulas (as in 2 NaCl) are called
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a.
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exponents
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b.
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subscripts
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c.
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coefficients
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d.
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none of these
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50.
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A single coefficient of 2 will balance which of the following equations?
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a.
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Fe + O2 --> Fe2O3
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c.
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NaCl --> Na + Cl2
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b.
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N2 + H2 --> NH3
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d.
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Cu2 O + C --> Cu + O2
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51.
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A single coefficient of 5 will balance which of the following equations?
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a.
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NaOH --> Na2O + H2O
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c.
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2N2 + O2 --> 2N2O5
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b.
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Fe + HCl --> FeCl2 + H2
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d.
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NaCl --> 2Na + Cl2
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52.
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The reaction between sulfur trioxide and water (SO3 + H2 O ---> H2 SO4 ) is classified as
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a.
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replacement
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c.
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decomposition
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b.
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synthesis
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d.
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none of these
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53.
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What is the number of chlorine atoms represented by 2FeCl2 ?
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a.
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two
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b.
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three
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c.
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four
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d.
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none of these
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Completion
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54.
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Balance this chemical equation: (Note: Answer format is x,x---x with NO SPACES!)
Al + Cl2 -----> AlCl3
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55.
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Balance this chemical equation: (Note: Answer format is x,x---x,x with NO SPACES!)
CH4 + O2 -----> CO2 + H2O
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56.
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Balance this chemical equation: (Note: Answer format is x,x---x,x with NO SPACES!)
Cu2O + C -----> Cu + CO2
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57.
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Balance this chemical equation: (Note: Answer format is x,x---x with NO SPACES!)
Fe + O2 -----> Fe2O3
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58.
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The property of an element that indicates the number of electrons in its atoms is the ______ _______.
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59.
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By adding Borax to Elmers glue in the Slime Lab we created a cross-linked _____________.
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60.
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A molecule of table sugar, C12H22O11, has a total of ____________________ atoms.
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61.
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When CO2 is exhaled into lime water a new substance, limestone (CaCO3), is formed. Chemists call this substance a _______.
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62.
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In the baking soda / vinegar lab the plastic bag became cold. Chemists classify this reaction as ________.
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63.
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The process of dry ice changing from a solid directly to a gas is called ____________.
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64.
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Rust forms when iron atoms combine with oxygen in the air to create iron oxide (Fe + O2 ® Fe2O3). This chemical reaction would be classified as a ___________ reaction..
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65.
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In a burning candle heat from the flame melts wax below the wick. Wax is carried up the wick through a process called ________ _________. The liquid wax on the wick is heated, vaporized, and then ignited as fuel for the candle.
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66.
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Give the electron shell configuration for OXYGEN (atomic # of 8).
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67.
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Give the electron shell configuration for SODIUM (atomic # of 11).
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68.
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Give the electron shell configuration for SULFUR (atomic # of 16).
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69.
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Give the electron shell configuration for POTASSIUM (atomic # of 19).
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70.
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Give the electron shell configuration for CARBON (atomic # of 6).
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71.
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Give the electron shell configuration for KRYPTON (atomic # of 36).
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72.
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Give the chemical formula for the compound called WATER.
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73.
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Give the chemical formula for the compound called METHANE.
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74.
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Give the chemical formula for the compound called AMMONIA.
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75.
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Give the chemical formula for the compound called SALT.
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76.
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Give the chemical formula for the compound called CARBON DIOXIDE.
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Matching
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Valence Diagrams for Chemical Elements
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<> *
a. (1 electron)
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<> *
*
b. (2 electrons)
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* <> *
*
c. (3 electrons)
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*
* <> *
*
d. (4 electrons)
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*
* <> **
*
e. (5 electrons)
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*
* <> **
**
f. (6 electrons)
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*
** <> **
**
g. (7 electrons)
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**
** <> **
**
h. (8 electrons)
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77.
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SILICON -- atomic # of 14; mass = 26.982 amu
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78.
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FLUORINE -- atomic # of 9; mass = 18.998 amu
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79.
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BERYLLIUM -- atomic # of 4; mass = 9.012 amu
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80.
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ARGON -- atomic # of 18; mass = 39.948 amu
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81.
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BORON -- atomic # of 5; mass = 10.811 amu
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82.
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SODIUM -- atomic # of 11; mass = 22.990 amu
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