Chemical equations

Question 1

Salt + Water

Example: HNO3 +NaOH > NaNO3 + H20

Answer 1

Acid + Metal hydroxide reaction

Question 2

Salt + Water

Example: SO3 + 2NaOH > Na2SO4 + H2O

Answer 2

Non-Metal oxide + Metal hydroxide reaction

Question 3

Salt + Water

2HCl + Na2O > 2NaCL +H2O

Answer 3

Acid + Metal oxide reaction

Question 4

Salt + Water + Carbonate

Example: 6HNO3 + Fe2(CO3)3 > 2Fe(NO3)3 + 3H2O +3CO

Answer 4

Acid + Carbonate

Question 5

Salt + Water
also known as neutralisation
Example: 2Hcl + Mg(OH)2 > MgCl2 + 2H2O

Answer 5

Acid + Base reaction

Question 6

This occurs when a chemical compound is broken down into different compounds using thermal energy (Heat)
Example:
Calcium carbonate powder > Calcium oxide powder + Carbon dioxide gas
CaCO3 (Strong heat)> CaO + CO2

Answer 6

Thermal Decomposition

Question 7

Example
Nitrogen gas + Hydrogen gas > Ammonia gas
N2 +3H2 > 2NH3

Answer 7

Combination Reaction

Question 8

This reaction occurs usually in an aqueous solution
Example:
Sodium Chloride solution + Silver Nitrate > Silver Chloride ppt + Sodium Nitrate
NaCl (aq) + AgNO3 (aq) > AgCl (s) + NaNO3 (aq)

Answer 8

Precipitation Reactions

Question 9

A reaction of an element or compound with oxygen to form an oxide and produce heat.
Example: C4H10 + O2 > CO2 (g) + H20 (g)

Answer 9

Combustion reaction

Question 10

reactive metal + Metal ion solution > Another metal displaced + Ions of reactive metal
Example: Cu (s) + 2AgNO3 > 2Ag + Cu(NO3)2

Answer 10

Single replacement reaction

Question 11

When a metal is less reactive than another metal in an ion solution
Example
Mg (s) + Na2SO4 (aq)
Mg is less reactive than Na

Answer 11

No Reaction