Regents Chemistry Unit 9: Question Preview (ID: 19396)


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Increasing the temperature has what influence on reaction rate?
a) Decrease
b) Increase
c) Remain the same
d) Uh, I like tacos

What type of reactions occur very quickly?
a) Covalent
b) Metallic
c) Ionic
d) Violent

What type of reactions occur very slowly and usually require a catalyst to proceed in biological systems?
a) Covalent
b) Metallic
c) Ionic
d) Violent

Increasing the number of effective collisions will have what influence on chemical reaction rate
a) Increase
b) Decrease
c) Remain the same
d) Uh, I like tacos

What type of substance can be added to a reaction to slow down the reaction by adding additional steps to the mechanism?
a) Catalyst
b) Product
c) Inhibitor
d) Reactant

What type of substance can be added to a reaction to speed up the reaction by providing an alternate pathway?
a) Inhibitor
b) Reactant
c) Catalyst
d) Product

A chemical reaction can only proceed as fast as the
a) Electronegativities allow
b) Rate determining step
c) Speed of light
d) Speed of sound

In a diatomic molecule, what must occur to break the bonds that exist between the two molecules?
a) Energy must be absorbed
b) Energy must be released
c) The hokey pokey
d) An increase in electronegativity of each atom

Particles that collide with the correct amount of energy and in the proper orientation can lead to
a) Effective collisions
b) Ineffective collisions
c) Reciprocal transmutations
d) Altered Hemizygosity

Increasing the concentration of reactants has what influence on reaction rate?
a) Increase
b) Decrease
c) Remain the same
d) Uh, I like tacos

Increasing the surface area has what influence on reaction rate?
a) Decrease
b) Increase
c) Remain the same
d) Uh, I like tacos

In a written chemical equation, energy on the left side of the arrow indicates which type of reaction?
a) Endothermic
b) Exothermic
c) Covalent
d) Ionic

In a written chemical equation, energy on the right side of the arrow indicates which type of reaction?
a) Endothermic
b) Ionic
c) Covalent
d) Exothermic

What term is used to describe the amount of energy that is needed to start a chemical reaction?
a) Heat of the reaction
b) Enthalpy
c) Activation energy
d) Entropy

The difference between the energy of the reactants and the energy of the products in a chemical reaction is referred to as the
a) Activation energy
b) Heat of the reaction
c) Encephalopathy
d) Entropy

What must be true if a system is at equilibrium?
a) The rate of the forward reaction is the same as the rate of the reverse reaction
b) The amount of reactants is the same as the rate of the products
c) The temperature is 273 K
d) All reactants are gases

Reactions that have an increase in entropy tend to be favored. Which answer choice indicates an increase in entropy, the disorder of a system?
a) Liquid to Solid
b) Gas to Solid
c) Gas to Liquid
d) Solid to Liquid

What effect would increasing the concentration of a reactant have on a system at equilibrium?
a) Shift to the left
b) Shift to the right
c) No effect
d) Uh, I like tacos

What effect would decreasing the concentration of a product have on a system at equilibrium?
a) Shift to the right
b) Shift to the left
c) No effect
d) Uh, I like tacos

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