Physical Science

Chapter 21: Chemical Reactions

Section 4 Self-Check Quiz-Eng.

1.
Which of the following is a chemical reaction?
A)rust forming on a car body
B)water evaporating from salt water leaving salt crystals
C)water freezing into ice
D)dew forming on grass
2.
When iron combines with oxygen and water in the air to form rust, what substance in the reaction is the product?
A)rust
B)iron
C)oxygen
D)water
3.
As a result of the experiments of Lavoisier, you know that in a chemical reaction the mass of the products __________.
A)is twice as great as the mass of the reactants
B)is less than the mass of the reactants
C)always equals the mass of the reactants
D)cannot be predicted based on the mass of the reactants
4.
Which of the following symbols in a chemical equation means "produces"?
A)+
B)[p]
C)(aq)
D)→
5.
A(n) __________ is a substance that speeds up a chemical reaction without being permanently changed itself.
A)catalyst
B)inhibitor
C)exotherm
D)endotherm
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