CH4​ + 2 O2 methane + oxygen

→ CO2 + H2O + energy heat → carbon dioxide + water + energy

NaOH + HCl sodium hydroxide + hydrochloric acid

→ NaCl + H2O → sodium chloride + dihydrogen monoxide

N2 + 3 H2 nitrogen + hydrogen { with pressure, catalyst, and promoter}

Fe → 2 NH3 Mo iron [catalyst] → ammonia molybdenum

Zn + H2SO4 zinc + sulphuric acid

→ ZnSO4 + H2 → zinc sulphate + hydrogen gas [evolved by effervescence]

NaSO3 + 2 HCl sodium sulphite + hydrochloric acid

→ 2 NaCl + H2O + SO2 → sodium chloride + water + sulphur dioxide [smells like burning sulphur; suffocating odour]

Fe + CuSO4 iron + copper sulphate [blue aqueous solution]

→ FeSO4 +Cu → iron sulphate [pale green solution] + copper [reddish brown solid]

CuSO4 + H2S copper sulphate [blue solution] + hydrogen sulphide

C2S + H2SO4 →copper sulphide [black solid] + sulphuric acid

2 Pb(NO3)2 lead nitrate

→ 2 PbO + O2 + NO2 heat → lead monoxide [yellow] + oxygen + nitrogen dioxide [brown vapours]

AgNO3 + NaCl silver nitrate [aq] + sodium chloride [aq]

→ AgCl [PPT] + NaNO3 → silver chloride [white ppt] + sodium nitrate [aq]

FeSO4 + 2 NaOH ferrous sulphate + sodium hydroxide

→ Fe(OH)2 [PPT] + Na2SO4 → ferrous hydroxide [dirty green ppt] + sodium sulphate

H2S + Cl2 hydrogen sulphide +chlorine

→ HCl + S →hydrochloric acid + sulphur [yellow solid]

NH3 + HCl ammonia + hydrochloric acid

NH4Cl → ammonium chloride

2 Na + 2 H2O sodium + dihydrogen monoxide

→ 2 NaOH + 2 H2 → sodium hydroxide + hydrogen

BaCl + H2SO4 barium chloride + sulphuric acid

→ BaSO4 + 2HCl →barium sulphate [white ppt] + hydrochloric acid

6 CO2 + 6 H2O carbon dioxide+ water {with light energy}

→ C6H12O6 + 6 O2 → glucose + oxygen

2 H2O Water {with electricity}

→ 2 H2 + O2 → hydrogen + oxygen

Fe + S iron + sulphur {with heat energy}

→ FeS → iron sulphide

2 KClO3 potassium chlorate {with catalyst}

→ 2 KCl + 3 O2 → potassium chloride + oxygen

C + O2 carbon + oxygen

CO2 → carbon dioxide

H2 + Cl2 hydrogen + chlorine

→ 2HCL → hydrochloric acid

PCl3 + Cl2 phosphorus trichloride + chlorine

→ PCl5 → phosphorus pentachloride

SO2 + H2O sulphur dioxide + water

H2SO3 → sulphurous acid

NO5 + H2O nitrogen pentoxide + water

→ 2 HNO3 → nitric acid

CaO + H2O calcium oxide + water

→ Ca(OH)2 → calcium hydroxide

MgO mercuric oxide

→ Mg + O2 → mercury + oxgen

2KNO3 Potassium nitrate

→ 2KNO2 + O2 → potassium nitrite + oxygen

CaCO3 calcium carbonate

→ CaO + CO2 → calcium oxide + carbon dioxide

yellow solid

sulphur

black solid

copper sulphide

gas with rotten egg odour

hydrogen sulphide

gas with suffocating odour

sulphur dioxide

blue solution

copper sulphate

light green solution

iron sulphate

dirty green ppt

iron hydroxide [Fe(OH)2]

white ppt formed when barium chloride reacts with sulphuric acid

barium sulphate

white ppt formed when sodium chloride reacts with AgNO3

silver chloride

yellow solid formed after decomposition of lead nitrate

lead monoxide

brown gas formed after decomposition of lead nitrate

nitrogen dioxide

glows white on heating

magnesium

acts as a negative catalyst on the decomposition of hydrogen sulphide

phosphoric acid [P3H4]

what is a catalyst

a chemical that either speeds up or slows down the reaction without actually taking part in the reaction

positive catalyst example

1. iron, in the formation of ammonia 2. manganese dioxide in the formation of potassium chloride and oxygen

what are catalysts in the human body

enzymes like amylase, trypsin, pepsin, and maltase act as catalysts in the human body

combination / synthesis reaction

when 2 or more substances combine to form a new substance.

decomposition reaction

when a substance breaks down into 2 or more simpler substances

sulphurous acid

H2SO3

sulphuric acid

H2SO4

hydrochloric acid

HCl

carbonic acid

H2CO3

nitric acid

HNO3

acetic acid

CH3COOH