C8 - Rates and equilibrium

Question 1

Rate of reaction

Answer 1

The speed at which a reaction happens

Question 2

Collision theory

Answer 2

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

Question 3

Activation energy

Answer 3

The minimum amount of energy needed to start a reaction.

Question 4

Concentration

Answer 4

A measure of how much solute is dissolved in a solvent such as water

Question 5

Catalyst

Answer 5

A substance that speeds up a chemical reaction but remains chemically unchanged itself at the end of the reaction.

Question 6

Reversible reaction

Answer 6

A reaction in which the products can re-form the reactants

Question 7

Hydrated

Answer 7

Describes a substance which contains water in its crystals

Question 8

Anhydrous

Answer 8

Describes a substance that does not contain water

Question 9

Equilibrium

Answer 9

The point in a reversible reaction at which the forward and backward rates of reaction are the same. Therefore, the amounts of substance present in the reaction mixture remain constanT.

Question 10

Le Chateliers principle

Answer 10

When a change in conditions is introduced to a system at equilibrium, the position of equilibrium shifts so as to cancel out that change.

Question 11

Pressure

Answer 11

The force exerted divided by the are on which the force is exerted. (Pa)