C2.4 Rates and Energy

Question 1

What methods can be used to measure the rate of a reaction?

Answer 1

Measuring the decreasing mass, measuring the volume of gas given off, measuring the decreasing light passing through a solution

Question 2

rate of reaction=

Answer 2

amount of reactant used or amount of product formed/time

Question 3

What are the factors affecting the rate of a chemical reaction?

Answer 3

temperature, surface area, concentration/pressure and presence of a catalyst

Question 4

what is the collision theory?

Answer 4

an explanation of chemical reactions in terms of reacting particles colliding with sufficient energy for a reaction to take place

Question 5

What is the activation energy?

Answer 5

the smallest amount of energy that particles must have before they can react

Question 6

What can you increase to increase the chance of particles reacting?

Answer 6

the chance of the reacting particles to collide, increase the energy that they have when they collide

Question 7

Why does raising the temperature increase the rate of reaction?

Answer 7

particles collide more often and particles collide with more energy

Question 8

Advantages to using catalysts

Answer 8

save the environment and money

Question 9

Examples of endothermic reaction

Answer 9

thermal decomposition

Question 10

Examples of exothermic reaction

Answer 10

neutralisation, respiration

Question 11

If a reversible reaction is exothermic, does it move to A+B or C+D?

Answer 11

C+D