AQA CHEMISTRY PAPER 2
Rate of reaction
The speed at which a chemical reaction happens.
Reactant
The substances that are present before a chemical change takes place.
Product
A substance produced by a chemical reaction
,Collision theory
states that atoms, ions, and molecules must collide in order to react.
Entropy
a measure of the degree of disorder in a system
Pressure
, a measure of force exerted per unit area; in chemistry, most commonly the force
exerted by gas molecules as they strike the surfaces around them
Catalyst
A substance that speeds a chemical reaction by lowering the activation energy of the
reaction.
Climate change
recent changes in the Earth's climate; evidence suggests that this is primarily due to
human influence, including the increased release of greenhouse gases
Red litmus
Turns blue in alkaline solution
Blue litmus
Turns red in acidic solution
Hydrated
A crystalline compound containing water molecules
Rate of reaction
The speed at which a chemical reaction happens.
Reactant
The substances that are present before a chemical change takes place.
Product
A substance produced by a chemical reaction
,Collision theory
states that atoms, ions, and molecules must collide in order to react.
Entropy
a measure of the degree of disorder in a system
Pressure
, a measure of force exerted per unit area; in chemistry, most commonly the force
exerted by gas molecules as they strike the surfaces around them
Catalyst
A substance that speeds a chemical reaction by lowering the activation energy of the
reaction.
Climate change
recent changes in the Earth's climate; evidence suggests that this is primarily due to
human influence, including the increased release of greenhouse gases
Red litmus
Turns blue in alkaline solution
Blue litmus
Turns red in acidic solution
Hydrated
A crystalline compound containing water molecules
