Multiple Choice
Identify the choice that best completes the statement or answers the question.
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1.
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The chemical element that is most abundant in the human body is
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a.
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nitrogen. |
c.
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carbon. |
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b.
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iron. |
d.
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oxygen. |
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2.
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A molecule of water (H2O) is made from _____ combining two hydrogen atoms and one oxygen atom.
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a.
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physically |
c.
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thermally |
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b.
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ionically |
d.
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chemically |
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3.
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You put 1 spoonful of salt into 1 liter of water and stir. The resulting liquid is an example of a(n)
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a.
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pure substance. |
c.
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heterogeneous mixture. |
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b.
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homogeneous mixture. |
d.
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immiscible mixture. |
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4.
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A material that can be represented by a chemical formula is
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a.
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an element. |
c.
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a homogeneous solution. |
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b.
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a mixture. |
d.
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a pure substance. |
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5.
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The chemical formula for water, H2O, means that each water molecule contains
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a.
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two hydrogen atoms and two oxygen atoms. |
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b.
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two hydrogen atoms and one oxygen atom. |
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c.
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two hydrogen atoms and zero oxygen atoms. |
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d.
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one hydrogen atom and two oxygen atoms. |
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6.
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Lead has a density of 11.3 g/cm3 and a mass of 282.5 g. What is its volume?
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a.
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2.5 cm3 |
c.
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250 cm3 |
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b.
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25 cm3 |
d.
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2500 cm3 |
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7.
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Which of the following is not a potential sign of chemical change?
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a.
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release of gas |
c.
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change of color |
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b.
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evaporation of water |
d.
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production of gas |
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8.
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The smallest unit of an element that maintains the properties of that element is a(n)
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a.
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molecule. |
c.
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substance. |
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b.
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atom. |
d.
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compound. |
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9.
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Solids, liquids, and gases are three forms of matter that
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a.
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take up space. |
c.
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are made of atoms. |
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b.
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have mass. |
d.
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All of the above |
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10.
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How many atoms are in a single molecule of Fe2O3?
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11.
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Which of the following is not a pure substance?
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a.
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element |
c.
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compound |
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b.
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molecule |
d.
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mixture |
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12.
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Which of the following is an element?
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a.
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salt |
c.
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nylon |
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b.
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iron |
d.
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sand |
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13.
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A group of atoms that acts as a unit is called a(n)
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a.
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mixture. |
c.
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element. |
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b.
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molecule. |
d.
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compound. |
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14.
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Diamond is known for its
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a.
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hardness. |
c.
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reactivity. |
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b.
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flammability. |
d.
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All of the above |
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15.
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What is the density of a sample of liquid that has a volume of 125 mL and a mass of 200 g?
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a.
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75 g/mL |
c.
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1.6 g/mL |
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b.
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16 g/mL |
d.
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0.625 g/mL |
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16.
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Helium is used in balloons because it is
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a.
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reactive with rubber. |
c.
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flammable. |
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b.
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lighter than air. |
d.
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a colored gas. |
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17.
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A chemical property of copper is its
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a.
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density. |
c.
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color. |
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b.
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reactivity. |
d.
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melting point. |
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18.
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A physical property of gold is its
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a.
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density. |
c.
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nonflammability. |
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b.
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reactivity with powerful acids. |
d.
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None of the above |
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19.
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Aluminum is used in kitchen foil because it is
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a.
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very heavy. |
c.
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shiny. |
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b.
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hard to bend. |
d.
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None of the above |
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20.
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An object’s volume can be found by dividing its mass by its
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a.
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pressure. |
c.
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density. |
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b.
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temperature. |
d.
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weight. |
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21.
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Which of the following is not a physical property of iron?
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a.
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melting point |
c.
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color |
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b.
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ability to rust |
d.
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conductivity |
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22.
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Which property of a substance is not affected by physical changes?
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a.
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reactivity |
c.
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shape |
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b.
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size |
d.
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position |
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23.
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The different substances in a mixture
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a.
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keep their properties. |
c.
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form new molecules. |
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b.
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combine chemically. |
d.
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cannot be separated. |
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24.
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Which of the following is not a potential sign of chemical change?
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a.
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change in odor |
c.
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change in color |
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b.
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fizzing |
d.
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boiling |
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25.
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How can a chemical change be reversed?
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a.
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by chemical changes |
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b.
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by physical changes |
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c.
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by both chemical and physical changes. |
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d.
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None of the above |
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26.
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Which of the following causes a chemical change?
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a.
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moving |
c.
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burning |
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b.
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shattering |
d.
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melting |
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27.
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Which of the following results in a mixture?
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a.
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baking a cake |
c.
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dissolving salt |
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b.
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burning a log |
d.
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digesting food |
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28.
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A chemical change occurs whenever
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a.
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substances are mixed. |
c.
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hot objects melt. |
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b.
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objects change shape. |
d.
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new substances form. |
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29.
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Which tool is best for separating a mixture of sand and water?
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a.
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tweezers |
c.
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centrifuge |
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b.
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magnet |
d.
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filter |
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30.
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Which of the following is a physical change?
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a.
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dissolving |
c.
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bending |
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b.
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evaporating |
d.
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All of the above |
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31.
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Chemical changes can affect physical and chemical properties whereas physical changes can affect
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a.
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chemical properties. |
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b.
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physical properties. |
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c.
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both chemical and physical properties. |
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d.
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None of the above |
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32.
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Matter is defined as anything that
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a.
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can be seen and touched. |
c.
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can be weighed. |
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b.
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has mass and takes up space. |
d.
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contains kinetic energy. |
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33.
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The smallest unit of a substance that behaves like the substance is a(n)
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a.
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element |
c.
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atom |
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b.
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molecule |
d.
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compound |
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34.
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The chemical symbol for sulfuric acid is H2SO4. How many atoms are contained in each molecule of sulfuric acid?
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35.
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Which of the following is an example of a gas-liquid mixture?
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a.
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the air we breathe |
c.
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a carbonated drink |
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b.
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a helium balloon |
d.
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ice cubes |
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36.
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Which of the following is an element?
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a.
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steel |
c.
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iron |
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b.
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bronze |
d.
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brass |
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37.
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Which of the following is made of at least two different types of atoms?
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a.
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element |
c.
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compound |
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b.
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molecule |
d.
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matter |
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38.
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Unlike a mixture, a pure substance has
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a.
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atoms |
c.
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a specific size. |
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b.
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molecules |
d.
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a fixed composition. |
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39.
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Which of the following is not an example of a physical property?
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a.
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freezing point |
c.
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boiling point |
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b.
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reactivity |
d.
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density |
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40.
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A substance has a mass of 360 g and a volume of 7.5 mL. What is its density?
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a.
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2,700 g/mL |
c.
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270 g/mL |
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b.
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480 g/mL |
d.
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48 g/mL |
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41.
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Stainless steel has chemical properties such as
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a.
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hardness. |
c.
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high melting point. |
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b.
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resistance to rust. |
d.
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electrical conductivity. |
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42.
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Which of the following is an example of a chemical change?
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a.
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ice melting |
c.
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paint fading |
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b.
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pounding gold into a coin |
d.
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a puddle of water evaporating |
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43.
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Digesting food is an example of
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a.
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physical change. |
c.
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change of state. |
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b.
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chemical change. |
d.
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buoyancy. |
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44.
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The science of what matter is made of and how it changes is called
|
a.
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chemistry. |
c.
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kinetics. |
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b.
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physics. |
d.
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engineering. |
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45.
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A substance that cannot be broken down into simpler substances is a(n)
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a.
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compound. |
c.
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element. |
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b.
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mixture. |
d.
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atom. |
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46.
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The chemical formula for table sugar is C12H22O11. How many oxygen atoms are in each sugar molecule?
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47.
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You put a spoonful of salt into 1 liter of water and stir. The resulting liquid is an example of a(n)
|
a.
|
pure substance. |
c.
|
heterogeneous mixture. |
|
b.
|
homogeneous mixture. |
d.
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immiscible mixture. |
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48.
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Which of the following is an example of a chemical property?
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a.
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reactivity with oxygen |
c.
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density |
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b.
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solubility in water |
d.
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color |
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49.
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Which of the following is not an example of a physical property?
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a.
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freezing point |
c.
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boiling point |
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b.
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reactivity |
d.
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density |
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50.
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Knowing the chemical properties of a substance will tell you how the substance
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a.
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looks. |
c.
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smells. |
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b.
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can be broken down into atoms. |
d.
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reacts with other substances. |
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51.
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Which of the following is an example of a physical change?
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a.
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dissolving salt in water |
c.
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burning wood into charcoal |
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b.
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cooking an egg |
d.
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rusting iron |
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Matching
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Match each item to the correct term below.
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a.
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table sugar |
c.
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rust |
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b.
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water |
d.
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copper |
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52.
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H2O
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53.
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Cu
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54.
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C12H22O11
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55.
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Fe2O3
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