Chemistry Flashcards
Define Alkali:
A base that dissolves in water.
Define alkaline solution:
A solution that contains a base.
Define Indicator:
A substance that changes colour in the presence of an acid or a base.
Define Litmus Paper:
A paper containing an indicator that turns red when exposed to an acid and blue when exposed to a base.
Define Universal indicator:
A solution that is used to determine the pH (amount of acid or base) of a solution.
Define pH scale:
A scale that represents the acidity or basic it’s of a solution: pH <7 indicates an acid; pH >7 indicates a base; pH 7 indicates a neutral solution.
Define neutral:
(pH 7) neither an acid nor a base; for example water.
Define neutralisation reaction:
A reaction between an acid and a base that produces water and a salt.
Define corrosion:
The gradual destruction of materials by a chemical reaction with their environment.
Define an exothermic reaction:
A chemical reaction that releases energy in the form of heat or light.
Define endothermic reaction:
A chemical reaction that absorbs energy in the form of heat.
Example of endothermic reaction:
Photosynthesis and ice cube melting.
Example of exothermic reaction:
Burning of a candle.
Where is energy stored?
In the chemical bonds and can be released when bonds break.
Acids will make litmus paper turn to what colour?
Red
