Unit 1

Question 1

Rate of reaction

Answer 1

Change in quantity / time taken

Question 2

reactions can be measure by changes in

Answer 2

concentration, mass and volume

or volume of gas produced

Question 3

rate of reaction using time only

Answer 3

colour change eg

1/time unit:s-1

Question 4

why must dry beaker be used?

Answer 4

keep concentration constant - water will dilute

keep total volume constant

Question 5

collision theory

Answer 5

collide with each other with enough energy and correct geometry

Question 6

particle size ror

Answer 6

smaller faster as greater surface area

Question 7

temperature ror

Answer 7

heating gives them more energy - higher temp faster and more chance of collisions with enough energy

Question 8

concentration and ror

Answer 8

more crowded the greater chance of collision - more conc faster reaction

Question 9

Boltzmann energy distribution curve

Answer 9

show the number of particles in chemical reaction with increasing kinetic energy. Shows Ea

Question 10

Ea

Answer 10

Minimum energy required by reactants to make products during chemical reaction