Chemical Reactions - Kinetics

If the concentrations of the reactants decrease, what will happen to the rate of the reaction?

• the rate will decrease

• the rate will increase

• more information is needed

• the rate will not change

If two reactant particles collide, but bounce away unaffected, this is called a(n) ____.

• effective collision

• rearrangement of atoms

• ineffective collision

• successful collision

Enough kinetic _________ and proper orientation are the two requirements for a collision of reactants to form a product.

• action

• motion

• velocity

• energy

under the collision theory, the particles must collide with _____ and _____ for a reaction to occur.

• sufficient energy; correct orientation

• rate; sufficient energy

• catalyst; sufficient energy

• surface area; correct orientation

The minimum energy required to start a chemical reaction is known as:

• potential energy

• kinetic energy

• activation energy

• thermal energy

As a reactant mixture is heated, the ______ energy of the reacting molecules increases.

• ionization

• free

• activation

• kinetic

As ______ increases, the proportion of collisions which can overcome the activation energy for the reaction increases.

• pressure

• humidity

• size

• temperature

Which is true for an endothermic reaction?

• heat will be absorbed in a reaction

• heat will be released in a reaction

• the energy of the products is lower than the energy of the reactants

• the energy of the reactants and products will be the same

An energy diagram for a reaction is shown. Which letter represents the activation energy of the reaction?

• E

• D

• C

• A

• B

The reaction shown in the image is:

• endothermic

• exothermic

• static

• at equilibrium