Physical Science Review 6.3 Question Preview (ID: 15653)
Controlling Chemical Reactions.
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When a catalyst is added to a system at equilibrium, a decrease occurs in the
a) activation energy
b) energy of reactants
c) energy of products
d) heat of reaction
Which conditions will increase the rate of chemical reaction?
a) increased temperature and increased concentration of reactants
b) increased temperature and decreased concentration of reactants
c) decreased temperature and increased concentration of reactants
d) decreased temperature and decreased concentration of reactants
In what type of reaction do the reactants have more energy than the products?
a) exothermic
b) endothermic
c) chemical
d) physical
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 alters the electrical conductivity of the reactant particles
c) This change increases the concentration of the reactant
d) This change increases the density of the reactant particles
Which condition will decrease the rate of chemical reaction?
a) increased concentration of product
b) increased catalyst
c) increased temperature
d) increased surface area
In what ways can temperature increase the rate of a chemical reaction?
a) particles at higher temperatures collide more often and have more energy
b) particles at higher temperatures collide less often and have less energy
c) particles at lower temperatures collide more often and have more energy
d) particles at lower temperatures collide less often and have less energy
Both endothermic and exothermic reactions need _________________ to get started
a) activation energy
b) water
c) oxygen
d) catalysts
A biological catalyst is called a
a) enzyme
b) inhibitor
c) activator
d) active site
A material that prevents reactants from coming together is called a
a) inhibitor
b) catalyst
c) active site
d) controller
Most endothermic reactions require a continuous source of
a) heat
b) catalysts
c) reactants
d) products
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