Question

Balance the word equation. ​

Answer 1

Answer:

A chemical equation shows the overall change of reactants to products in a chemical reaction.

Sometimes, state symbols are required to indicate the physical states of the substances in a chemical reaction.

The following table gives the physical states and the state symbols used in chemical equations: solid, liquid, gas, aqueous.

Chemical State Symbols

The following table gives the valency of some common ions. This table can be used to help you work out the chemical formula of the reactants and products.

Valency of Ions

Here are some simple covalent formulas that you will find useful to remember:

Water H2O,

Carbon Dioxide CO2,

Ammonia NH3,

Hydrogen H2,

Oxygen O2,

Nitrogen N2,

Sulfur Dioxide or Sulphur Dioxide SO2,

Methane CH4

Here are some simple ionic formulas that you will find useful to remember:

Sodium Chloride NaCl,

Calcium Chloride CaCl2,

Magnesium Oxide MgO,

Hydrochloric Acid HCl,

Sulfuric Acid or Sulphuric Acid H2SO4,

Nitric Acid HNO3,

Sodium Hydroxide NaOH,

Potassium Hydroxide KOH,

Calcium Hydroxide Ca(OH)2,

Calcium Carbonate CaCO3,

Aluminum Oxide Al2O3,

Iron Oxide Fe2O3