Chemical Changes and Structure: Controlling the Rate

Question 1

Relative rate can be calculated using what equations?

Answer 1

Rate = 1/time 
Rate = Δquatity/Δt

Question 2

What does collision theory state?

Answer 2

That reactants must collide with the correct collision geometry and possess a minimum energy before a successful reaction occurs

Question 3

What is temperature a measure of?

Answer 3

The average kinetic energy of the particles in a substance

Question 4

What is activation energy?

Answer 4

The minimum kinetic energy required by required by colliding particles before a reaction may occur

Question 5

Energy distribution diagrams help explain what?

Answer 5

Why increasing the temperature significantly increases the reaction rate

Question 6

Reaction profiles show what?

Answer 6

The enthalpy change that occurs in a reaction and the activation energy

Question 7

Exothermic reactions have what?

Answer 7

A -ΔH

Question 8

Endothermic reactions have what?

Answer 8

A +ΔH

Question 9

What is the activated complex and where is it formed?

Answer 9

A high-energy, unstable arrangement of atoms.

It is formed at the top of the activation energy barrier.

Question 10

What do catalysts do?

Answer 10

Speed up a reaction by lowering the activation energy