First of all this is not a troll, second of all I'm generous enough to give you all the chemical equations in the HSC Course CAUSE I CAN.

Moving on:

How to write chemical equations:

  • An important part of the Preliminary course, that you must continue with throughout the HSC course, is learning how to:
    • construct word equations, e.g: methane + oxygen -> carbon dioxide + water
    • balance formulae equations, e.g: CH4 + 2O2 -> CO2 + 2H2O

You must be able to do this for the reactions you encounter in every module that you study, core and option.

There are three important steps involved:

  • Show all reactants and all products in the word equation.
  • Write the correct formula for each reactant and each product.
  • Balance the formula equation by placing coefficients (numbers) in front of formulas so that you have the same total number of each kind of atom on both the reactant side and the product side.
  • Remember that in chemical reactions atoms are just rearranged, not created or destroyed.

Summary of Chemical Equations Encountered in the Course (Useful List :P)

Production of Materials

Dissolving Bromine:

Br2 (aq) + H2O(l) <equil> HOBr(aq) + HBr(aq)

Bromine Decolourisation:


cyclohexene(aq) + 2HOBr(aq) -> dibromocyclohexane(aq)


Thermal Cracking

Cracking of Decane

Chemical Equations

C10H22-> 2C5H11 (radicals)

C5H11 (radical) -> C3H7 (radical) + C2H4

2C3H7 (radical) -> C6H14

Word Equations

Decane -> Pentyl radicals

Pentyl radicals -> Propyl radical + Ethene

Propyl radical -> Hexane

(HSC) Cracking of ethane

Chemical Equations

C2H6 (g) -> C2H4 (g) + H2 (g)

$\Delta$ H = +138 kJ/mol

Word Equations

Ethane -> Ethene + Hydrogen + 138 kJ/mol Energy

Catalytic cracking

(HSC) Catalytic cracking of Decane

Chemical Equations

C10H22 (l) -(zeolite)1> C2H4 (g) + C8H18 (l)

Word Equations

Decane -(zeolite)> Ethene + Octane

(HSC) Addition Reactions2

Chemical Equations

C2H4 (g) + H2 (g) -(nickel)> C2H6 (g)

Word Equations

Ethene + Hydrogen -(nickel)> Ethane

Chemical Equations

CH2CH2 (aq) + HCl(aq) -> CH3CH2Cl(aq)

Word Equations

Ethene + Hydrochloric Acid -> Chloroethane

Production of Ethanol (also hydration reaction)
Chemical Equations

CH2CH2 (aq) +H2O(l) -(H2SO4)> CH3CH2OH(aq)

Word Equations

Ethene + Water -> Ethanol


Vinyl Chloride
Chemical Equation

4CH2CH2 (g) + 2Cl2 (g) + O2 (g) -> 4CH2CHCl(g) + 2H2O(g)

Word Equation

Ethene + Chlorine + Oxygen -> Vinyl chloride + Water


Production of Styrene
Chemical Equations

C6H6 + CH2CH2 -> C6H5(C2H5)

C6H5(C2H5) + S _> C6H5(CHCH2) + H2S

Word Equations



** Initiation **

Ra(radical) + CH2=CH2 -> RaCH2CH2 (radical)

** Propagation **

RaCH2CH2 (radical) + nCH2=CH2 -> Ra(CH2=CH2)n(radical)

** Termination **

Ra(CH2=CH2)n(radical) + Ra(CH2=CH2)n(radical) -> Ra(CH2-CH2)nRa