SC18b Factors Affecting Rate

Question 1

what has to happen for chemical reactions to occur?

Answer 1

the reactant particles must collide or ‘bump’ together with enough energy to react

Question 2

activation energy?

Answer 2

minimum amount of energy needed for a reaction to occur

Question 3

what is a successful collision?

Answer 3

particles collide with more energy than the activation energy

Question 4

what happens during successful collisions?

Answer 4

bonds in the reactants break and bonds in the products form

Question 5

exothermic reactions?

Answer 5

reactions that give out energy to the surroundings meaning the products will have less energy then the reactants

Question 6

endothermic reaction?

Answer 6

reactions that take in energy from the surroundings meaning the products will have more energy then the reactants

Question 7

when does the rate of reaction increase? 2

Answer 7

~when the particles collide with more energy
~when the particles collide more frequently

Question 8

increasing temperature on reaction rate

Answer 8

~reactant particles speed up and have more energy. There are more frequent collisions
~more particles have enough energy to react when they collide so more successful collisions

Question 9

smaller pieces (increase surface area) on reaction rate

Answer 9

~more surface for collisions to occur on, so there are more frequent collisions

Question 10

increasing pressure on reaction rate

Answer 10

~reactant particles are squeezed closer together so there are more frequent collisions.​