Name ______________________________________ Date _________
Unit 4 Lesson 1
Lesson worksheet
Chemical Reactions
Choose the letter of the best answer.
1. Which takes place when a chemical change
occurs? P214
4. Why does increasing temperature generally
increase the rate of a chemical reaction?
P220
A. Bonds connecting atoms in products and
reactants form.
A. It increases the amount of reactant.
B. Bonds connecting atoms in products and
reactants break.
B. It decreases the size of the reactant
particles.
C. Bonds connecting atoms in reactants
break, and bonds connecting atoms in
products form.
C. It causes the particles of the reactants to
move faster and collide more often.
D. It increases the space between reactant
particles so they have more room to move
apart.
D. Bonds connecting atoms in reactants
form, and bonds connecting atoms in
products break.
5. When coal is burned, sulfur is released into
the air, where it reacts with oxygen to
produce sulfur dioxide and sulfur trioxide.
Which of the following is true of this
process? P214
2. In photosynthesis, water (H2O) and carbon
dioxide (CO2) react to form oxygen (O2) and
glucose (C6H12O6). The following table
shows the reactants and products of
photosynthesis.
Reactants
6 H2O + 6 CO2
A. The identity of each reactant remains the
same.
Products
6 O2 + ? C6H12O6
B. Sulfur dioxide and sulfur trioxide are the
reactants in this change.
What number should replace the question
mark to show the number of C6H12O6
(glucose) molecules in a balanced chemical
equation? P216
C. The products have different chemical
properties than those of the reactants.
D. The products contain more sulfur atoms
and fewer oxygen atoms than the
reactants.
A. 1
B. 2
C. 6
D. 12
3. Which of the following is an example of an
endothermic reaction? P218
A. a cake baking
B. a candle burning
C. a firework exploding
D. a piece of wood smoldering
Lesson Quiz
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Module H • Assessment Guide