Collision theory

Question 1

For a reaction to take place, two things are necessary:

Answer 1

. The molecules of the reactant must collide.
. The molecules must collide with a certain minimum energy called
the activation energy

Question 2

The molecules have a range of speeds, so only collisions between fast/slow molecules result in a reaction.

Answer 2

fast

Question 3

The energy of the collision is determined by the speed of the _________.

Answer 3

molecules.

Question 4

The rate of the reaction depends on the rate at which effective collisions occur.

Answer 4

temperature and concentration

Question 5

why Temperature relevant for the effective collision to occur.

Answer 5

Increasing the temperature increases the speed of the molecules, so the collisions happen more often and with more energy and so the reaction rate increases.

Question 6

why Concentration relevant for the effective collision to occur.

Answer 6

Increasing concentration (or pressure in the case of a gas) increases the number of collisions and so the reaction rate increases