Rates Of Reaction U1

Question 1

What 4 ways can affect the rate of reaction

Answer 1

Temperature
Concentration
Particle size
Catalyst

Question 2

How does temperature affect the rate of reaction

Answer 2

When the temperature increases the particles gain energy causing the particles to bounce off each-other which speeds up the reaction

Question 3

How does concentration affect the rate of reaction

Answer 3

Increasing the concentration means there will be more particles which will speed up the reaction

Question 4

How does particle size affect the rate of reaction

Answer 4

Decreasing the particle size increases surface area which speeds up the reaction

Question 5

How does a catalyst affect rates of reaction

Answer 5

When a catalyst is used it increases reaction rate, which leads to a faster reaction

Question 6

What is a catalyst

Answer 6

A catalyst helps speed up chemical reactions and remains unchanged/can be used again

Question 7

Larger particle=smaller surface area meaning

Answer 7

A slower reaction

Question 8

Smaller particle=larger surface area meaning

Answer 8

Faster reaction

Question 9

What are the four different states

Answer 9

Solid (s)
Liquid (L)
Gas (g)
Aquias (aq)

Question 10

What does aquias (aq) mean

Answer 10

Dissolves in water solution

Question 11

What does homogeneous mean

Answer 11

A catalyst in the same state as a reactant

Question 12

What does heterogenous mean

Answer 12

A catalyst in a different state as a reactant

Question 13

What must happen for a reaction to occur

Answer 13

The particles that are reacting must collide with each other

Question 14

What is an enzyme

Answer 14

Enzymes are biological catalysts

Question 15

What is the equation for calculating rate of reaction

Answer 15

Average rate=
change in measurable quantity
\Change in time

Question 16

A pupil places 10g of potato into 1 mol/l hydrogen peroxide solution.
The potato has a biological catalyst inside it that breaks the hydrogen peroxide down to water and oxygen gas.
What term is used to describe a biological catalyst such as catalase?

Answer 16

Enzyme

Question 17

Which of the following factors will not speed up a chemical reaction?
o Increasing the temperature of the reaction
o Increasing the particle size of reactants
o Increasing the concentration of reactants

Answer 17

Increasing the particle size of reactants

Question 18

how do you calculate the relative rate

Answer 18

1/t

Question 19

what are spectator ions

Answer 19

they don’t take part in the actual reaction
they are there simply as part of other needed ions
- They appear unchanged and in the same state on each side of the reaction
- They can be removed to show the actual chemical reaction