Chemical equations

Question 1

Metal + oxygen

Answer 1

Metal + oxygen –> Metal oxide

Question 2

Metal + water

Answer 2

Metal + water –> Metal hydroxide + hydrogen

Question 3

Thermal decomposition of carbonates

Answer 3

Metal carbonate –> Metal oxide + Carbon dioxide

Question 4

Metal + Acid

Answer 4

Metal + Acid –> Salt + Hydrogen

Question 5

Metal oxide + Acid

Answer 5

Metal oxide + Acid —> Salt + Water

Question 6

Test for positive ions

Answer 6

Salt (aq) + Sodium hydroxide(aq) –> Metal hydroxide(s) + Sodium non-metal

Ionic:
Metal+ (aq) + Hydroxide- (aq) –> Metal hydroxide (s)

Question 7

Test for halides

Answer 7

Metal halide(aq) + Silver nitrate(aq) –> Silver halide(s) + Metal nitrate(aq)

Ionic:
Halide- (aq) + Silver+ (aq) –> Silver halide (s)

Question 8

Hydrocarbon Complete combustion

Answer 8

Hydrocarbon + oxygen –> Carbon dioxide + Water

Question 9

Hydrocarbon Incomplete combustion

Answer 9

Hydrocarbon + oxygen –> Carbon monoxide + Water

Question 10

Alkene Addition

Answer 10

Example:
C2H4 + Br2 –>C2H4Br2

Question 11

Aklane Substitution

Answer 11

Example:
CH4 + Br2 –> CH3Br + HBr

Question 12

Test for sulphates

Answer 12

Barium Chloride(aq) + Metal sulphate(aq) –> Barium Sulphate(s) + Chloride Salt(aq)

BaCl2 + Metal SO4(aq) –> BaSO4(s) + Metal Cl (aq)

Ba+2(aq) + SO4-2(aq) –> BaSO4(s)

Question 13

Test for carbonates

Answer 13

Hydrochloric acid (aq) + Metal Carbonate(aq) –> Metal Chloride (aq) + Water (l) + CO2(g)

HCl(aq) + Metal CO3(aq) –> Metal Cl(aq) + H2O(l) + CO2(g)

2H+ (aq) + CO3 -2 (aq) –> H2O (l) + CO2(g)

Question 14

Test for water

Answer 14

Copper(II) Sulphate (s) + Water (l) –> Hydrated Copper(II) Sulphate (s)

CuSO4(s) + 5H2O(l) –> CuSO4·5H2O(s)

Question 15

Regular combustion

Answer 15

Element + Oxygen —> Element oxide