Reaction Rate

Question 1

What is reaction rate?

Answer 1

How quickly the reactants form products

Question 2

What are the 2 ways to measure reaction rate?

Answer 2

1. The speed the reactant is used up
2. The speed the products are formed

Question 2

What is the reaction rate of gases measured in?

Answer 2

Volume (mL) / second

Question 2

What is the reaction rate of solids and liquids measured in?

Answer 2

Mass (grams) / second

Question 3

Formulas for the 2 ways to measure reaction rate

Answer 3

Quantity of reactant used up/time
Quantity of product formed/time

Question 4

What is the collision theory?

Answer 4

For a chemical reaction to occur, the particles (atoms, ions or molecules) must collide

Question 5

What do you need for a successful collision?

Answer 5

• The particles must have enough energy (activation energy)
• The particles must be in the correct orientation

Question 6

What is activation energy?

Answer 6

Activation energy is the minimum energy required for particles to collide and a chemical reaction to occur

Question 7

Concentration

Answer 7

By increasing the concentration of reactants:
- More particles per unit of volume
- Collisions are more likely to occur

Question 8

Pressure

Answer 8

By increasing the pressure of gases:
- More particles per unit of volume
- Collisions are more likely to occur

Question 9

Surface Area

Answer 9

By increasing the surface area:
- More space for the particles to react
- Higher likelihood for collisions

Question 10

Temperature

Answer 10

By increasing the temperature:
- Particles have more kinetic energy
- Collisions are more likely to succeed

Question 11

What is a catalyst?

Answer 11

Catalysts are chemicals that increase reaction rates by reducing activation energy without being chemically changed (catalysts don’t take part in the overall reaction)