Ks3 Chemical Reactions Key Words

Date : 28/02/2021

Uploaded by : Tamzin
Uploaded on : 28/02/2021
Subject : Chemistry

Chemical Reactions

Acid

Corrosive substance which has a pH lower than 7. Acidity is caused by a high concentration of hydrogen ions.

Alkali

A base which is soluble in water.

Base
&

A substance that neutralises an acid those that dissolve in water are called alkalis.

Chemical Formula

Shows the elements present in a compound and their relative proportions.

Chemical Reaction

A change in which a new substance is formed.

Concentration

A measure of the number of particles in a given volume.

Conserved
&

When the quantity of something does not change after a process takes place.

Corrosive

Able to damage metal, stonework, clothes and skin. Strong acids and alkalis are corrosive.

Dilute

A substance which contains very little of the dissolved substance.

Indicators

Substances used to identify whether unknown solutions are acidic or alkaline.

Irritant

A substance that can cause irritation to the skin.

Metals

Shiny, good conductors of electricity and heat, malleable and ductile, and usually solid at room temperature.

Neutral

A substance which is neither an acid nor an alkali.

Neutralisation

A reaction between an acid and an alkali.

Non-metals

Dull, poor conductors of electricity and heat, brittle and usually solid or gaseous at room temperature.

Scale of acidity and alkalinity from 0 to 14.

Physical Change

One that changes the physical properties of a substance, but no new substance is formed.

Products

Substances formed in a chemical reaction, shown after the reaction arrow in an equation.

Reactants

Substances that react together, shown before the arrow in an equation.
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