Changes of Matter – Chapter 2 – Quiz Questions #3
pp. 59 - 69

1. Define the term PHYSICAL CHANGE and give three examples.

2. Define the term CHEMICAL CHANGE and give three examples.

3. Name a substance that is NOT flammable. Name a substance that is NOT reactive.

4. Explain why changes of state are physical changes.

5. Explain why physical changes can easily be reversed but chemical changes cannot.

6. List three clues that indicate a chemical change has occurred.
      a)                                              b)                                          c)

7. Classify each of the following as a chemical change or a physical change:
          a) sugar being added to lemonade
          b) plants using carbon dioxide and water to form oxygen and sugar
          c) water boiling
          d) an egg frying
          e) rust forming on metal
          f) fruit rotting
          g) salt being removed from water by evaporation

8. A light green powder is heated in a test tube. A gas is given off while the solid becomes black.
      What type of change is occurring?  Explain your reasoning.

9. Use this table to answer the questions (NOTE: circle “element” or “compound” + count atoms):

a) Ethanol                  C₂H₆O – element or compound? number of atoms? ______
b) Baking Soda          NaHCO₃            – element or compound? number of atoms? ______
c) Hydrogen               H₂                          – element or compound? number of atoms? ______
d) Oxygen                  O₂                          – element or compound? number of atoms? ______
e) Ozone                    O₃                          – element or compound? number of atoms? ______
f) Table Salt               NaCl               – element or compound? number of atoms? ______

g) Sulfur                     S                     – element or compound? number of atoms? ______

h) Water                     H₂O                – element or compound? number of atoms? ______