C5.2 Controlling reactions

Question 1

catalyse

Answer 1

to speed up a reaction using a catalyst

Question 2

collide

Answer 2

to come into contact with something in reactions, a collision between two particles with enough energy for a reaction to happen

Question 3

directly proportional

Answer 3

when the rate of increase of one variable is the same as that of another variable

Question 4

enzyme

Answer 4

protein that acts as a catalyst in biological systems

Question 5

gas syringe

Answer 5

apparatus for measuring gas volumes

Question 6

inversely proportional

Answer 6

when the rate of increase of one variable is the same at the rate of decrease of another variable

Question 7

pressure

Answer 7

force per unit area. Air pressure increases when you pump air into a tyre

Question 8

reaction rate

Answer 8

the reaction rate for a given chemical reaction is the measure of the change in concentration of the reactants or the change in the concentration of the products per unit time

Question 9

reaction time

Answer 9

duration of a reaction from the start to the end

Question 10

successful collision

Answer 10

in reactions, a collision between two particles with enough energy for a reaction to happen