Year8_Chemistry

ionic bond

involves the reaction of two opposite positively charged ions

Endothermic

A reaction where energy is gained; temperature decreased

Exothermic

A reaction where energy is released; temperature increases

bubbles stop forming

When a reaction with a metal and acid is done

salt + hydrogen

metal + acid

water + salt

acid + alkali

water + salt + carbon dioxide

acid + carbonate

The number of protons and neutrons

Atomic mass

magnesium hydroxide, 5 atoms

Mg(OH)2

hydrochloric acid, 3 atoms

HCl

sulfuric acid, 10 atoms

H2SO4

the overall mass of the reactants stays the same during the reaction

conservation of mass

a reaction where elements switch places

displacement

an acid an alkali react together; pH 7; produces salt + water

neutralisation

burning a fuel

combustion

If there’s no more oxygen in a combustion reaction, it produces carbon monoxide.

incomplete combustion

To make sure the equation has equal atoms on both reactants and products:

balancing an equation