Content Mastery
and Energy
Section 4 Reaction Rates
and Equilibrium
Directions: Read the following passage. Then answer the questions on the lines provided.
Carlos was camping and getting cold as the sun went down. He wanted to light a fire
for warmth and light. However, he discovered that the nearby wood was wet, and would
not light. He had to look under some leaves and debris to find dry wood. He piled the
wood and surrounded it with a circle of stones to keep the fire contained. Then he put
some dry leaves around the logs to help the fire get started. He lit the leaves. Soon the
leaves had burned away, his fire was burning nicely, and Carlos was getting warmer.
1. Is the chemical reaction produced by Carlos's fire exergonic or endergonic?
How do you know?
2. Is the reaction in Carlos's fire endothermic or exothermic? Explain.
Column I
Re eactions
3. Do you think the leaves were a catalyst for the fire? Why or why not?
Directions: Match the terms in Column Il with the descriptions in Column I. Write the letter of the correct term
in the blank at the left.
unts
4. Substance that speeds up a chemical
reaction without being a part of it
5. States that atoms, ions, and molecules
must collide to react
6. Forward and reverse reactions proceed
at equal rates
7. Food preservative is an example
8. Stress applied to the products shifts the
reaction to the left
9. The rate at which reactants change into
products
Column II
a. Le Chatelier's principle
b. equilibrium
c. catalyst
d. reaction rate
e. collision model
f. inhibitor