Question

A)
According to collision theory, which of these is NOT required for particles to do to react?
(1 point)
The particles must react with sufficient energy.
The particles must collide.
The particles must collide with the correct orientation.
The particles must be in gas form.
B)
How does decreasing the concentration of a substance affect its reaction rate?
(1 point)
The reaction rate increases.
The reaction rate decreases.
The reaction rate is unchanged.
C)
How does decreasing the temperature of a substance affect the reaction rate?
(1 point)
The reaction rate increases.
The reaction rate decreases.
The reaction rate is unchanged.

Answer 1

A) The particles must be in gas form.
- Collision theory requires sufficient energy, collisions, and correct orientation, but not that reactants be gases (reactions can occur in liquids or solids).

B) The reaction rate decreases.
- Lower concentration means fewer collisions per time.

C) The reaction rate decreases.
- Lower temperature means fewer particles have the activation energy, so fewer effective collisions.