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Physical Science Review 6.3
Test Description: Controlling Chemical Reactions
Instructions: Answer all questions to get your test result.
1) When a catalyst is added to a system at equilibrium, a decrease occurs in the
A
energy of products
B
activation energy
C
energy of reactants
D
heat of reaction
2) Which conditions will increase the rate of chemical reaction?
A
increased temperature and decreased concentration of reactants
B
increased temperature and increased concentration of reactants
C
decreased temperature and increased concentration of reactants
D
decreased temperature and decreased concentration of reactants
3) In what type of reaction do the reactants have more energy than the products?
A
exothermic
B
endothermic
C
chemical
D
physical
4) Which statement explains why the speed of some chemical reactions is increased when the surface area of the reactant is increased?
A
This change exposes more reactant particles to a possible collision
B
This change increases the concentration of the reactant
C
This change increases the density of the reactant particles
D
This change alters the electrical conductivity of the reactant particles
5) Which condition will decrease the rate of chemical reaction?
A
increased catalyst
B
increased temperature
C
increased surface area
D
increased concentration of product
6) In what ways can temperature increase the rate of a chemical reaction?
A
particles at lower temperatures collide less often and have less energy
B
particles at lower temperatures collide more often and have more energy
C
particles at higher temperatures collide less often and have less energy
D
particles at higher temperatures collide more often and have more energy
7) Both endothermic and exothermic reactions need _________________ to get started
A
activation energy
B
catalysts
C
oxygen
D
water
8) A biological catalyst is called a
A
activator
B
inhibitor
C
active site
D
enzyme
9) A material that prevents reactants from coming together is called a
A
catalyst
B
active site
C
inhibitor
D
controller
10) Most endothermic reactions require a continuous source of
A
heat
B
catalysts
C
reactants
D
products
*select an answer for all questions
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