What are chemical reactions?

1 Answer

Chemical reactions are when new substances are formed. Substances that react together are called reactants, and the substances formed are called products. The products will have different properties to the reactants. A chemical reaction can be identified by, for example, by bubbles appearing (gas being produced), cloudiness of a solution, a change of colour, an explosion, heat given out, or a change of smell.

Chemical Equations are a basic mathematical statement showing the molecules involved as reactants and the outcomes known as products.

There are 6 basic forms of chemical equations.

Synthesis is a reaction of two atoms or molecules combining to form one product.

A+BAB
2H2+O22H2O

Decomposition is the breakdown of one molecule into component parts.

ABA+B
2KClO32KCl+3O2

Single Displacement reactions exchange one element with a molecule.

AB+CCB+A
CaCl2+MgMgCl2+Ca

Double Displacement reactions exchange two molecules.

AB+CDAD+CB
NaCl+KNO3NaNO3+KCl

Combustion reactions burn a hydrocarbon in oxygen to produce water and carbon dioxide.

CH+OCO2+H2O
C3H8+5O23CO2+4H2O

and

Neutralization reaction combine an acid and a base to neutralize into salt and water.

HA+BOHBA+H2O
HCl+NaOHNaCl+H2O

I hope this was helpful.
SMARTERTEACHER