Page 26 - Science Course 3 (Book 2)

Mo8-L2: Lesson Review Quiz (Matching)

Direction: On the line before each def nition, write the letter of the term that matches it correctly. Each
term is used only once

1. a starting substance in a chemical reaction A. chemical reaction
B. product
2. a substance produced in a chemical reaction
C. reactant
3. a number placed in front of an element symbol or chemical D. coef cient
formula in an equation

4. a process in which atoms of one or more substances rearrange
to form one or more new substances

Mo8-L2: Lesson Review Quiz (Multiple Choice)

Direction: On the line before each question, write the letter of the correct answer.

5. Which statement is correct?
A. Physical changes produce new substances; chemical changes do not.
B. Chemical changes produce new substances; physical changes do not.

C. Both physical changes and chemical changes produce new substances.
D. Neither physical changes nor chemical changes produce new substances.

6. All chemical reactions result in the formation of

A. bubbles in liquids.
B. precipitates in liquids.
C. substances with different colors.
D. substances with new chemical properties.

7. Which equation is balanced?
A. H2 + O2 ͢ H2O
B. 2Na + Cl2 ͢ 2NaCl

C. KClO3 ͢ KCl2 + 3O2
D. CH4 + 2O2 ͢ CO2 + H2O

8. Which situation does NOT occur during chemical reactions?

A. Bonds are broken.
B. Bonds are formed.
C. Mass is conserved.
D. Atoms are destroyed.

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