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AQA GCSE Chemistry Equations

Equations

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Equations are used to describe chemical reactions in terms of their reactants and products. They can be written as either a word equation or by using the correct formulae.

Chemical reactions

For equations to be chemically correct, they have to be balanced. This requires both sides of the equation to have the same charge and the same number of atoms of each element.

Balancing equations

Half equations are a type of ionic equation that represent either an oxidation (loss of electrons) or a reduction (gain of electrons). Like all equations, they need to be balanced. First you balance the atoms, adding water if you're missing oxygen or H+ if you're missing hydrogen. Then you balance the charges by adding electrons.

Half equations

Ionic equations show which ions interact directly in a chemical reaction and which are spectator ions. All aqueous, ionic compounds are split into their respective ions to form the full ionic equation. Then the spectator ions are cancelled out to create the net ionic equation. Half equations can be combined to create redox equations for a chemical reaction, but the number of electrons in each half equation must be the same. This can be achieved by multiplying the entire half equation.

Ionic equations

1

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Sodium metal reacts with chlorine gas to form the salt, sodium chloride. Write the word equation and corresponding chemical formula equation for this reaction.

AQA GCSE Chemistry Equations Sodium metal reacts with chlorine gas to form the salt, sodium chloride. Write the word equation and corresponding chemical formula equation for this reaction.
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2

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Solid copper and sulphur react together to form copper (II) sulphide. Write the word equation and corresponding chemical formula equation for this reaction.

AQA GCSE Chemistry Equations Solid copper and sulphur react together to form copper (II) sulphide. Write the word equation and corresponding chemical formula equation for this reaction.
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3

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Balance this equation for the combustion of ethane:

Cβ‚‚H₆ + Oβ‚‚ β†’ COβ‚‚ + Hβ‚‚O.

AQA GCSE Chemistry Equations Balance this equation for the combustion of ethane: 

Cβ‚‚H₆ + Oβ‚‚ β†’ COβ‚‚ + Hβ‚‚O.
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4

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Balance this equation for the neutralisation of phosphoric acid by sodium hydroxide:

H₃POβ‚„ + NaOH β†’ HNaβ‚‚POβ‚„ + Hβ‚‚O.

AQA GCSE Chemistry Equations Balance this equation for the neutralisation of phosphoric acid by sodium hydroxide:

H₃POβ‚„ + NaOH β†’ HNaβ‚‚POβ‚„ + Hβ‚‚O.
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5

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Rewrite the following word equation using the correct chemical formulae and then balance the equation:

aluminium + iron(III) oxide β†’ aluminium oxide + iron.

AQA GCSE Chemistry Equations Rewrite the following word equation using the correct chemical formulae and then balance the equation: 

aluminium + iron(III) oxide β†’ aluminium oxide + iron.
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6

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Is the silver metal being reduced or oxidised in the half equation provided below?

Ag β†’ Ag⁺ + e⁻

AQA GCSE Chemistry Equations Is the silver metal being reduced or oxidised in the half equation provided below?

Ag β†’ Ag⁺ + e⁻
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7

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Balance the half equation shown below.

Crβ‚‚O₇²⁻ β†’ Cr³⁺

AQA GCSE Chemistry Equations Balance the half equation shown below. 

Crβ‚‚O₇²⁻ β†’ Cr³⁺
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8

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Balance this half equation and state if it is an oxidation or reduction:

VO²⁻ β†’ VO₂⁻.

AQA GCSE Chemistry Equations Balance this half equation and state if it is an oxidation or reduction: 

VO²⁻ β†’ VO₂⁻.
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9

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Write a balanced net ionic equation for the reaction of ammonium chloride and sodium hydroxide.

AQA GCSE Chemistry Equations Write a balanced net ionic equation for the reaction of ammonium chloride and sodium hydroxide.
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10

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Balance and combine the two half-equations to determine the redox equation.

Hβ‚‚Oβ‚‚ β†’ Oβ‚‚
MnO₄⁻ β†’ Mn²⁺

AQA GCSE Chemistry Equations Balance and combine the two half-equations to determine the redox equation.

Hβ‚‚Oβ‚‚ β†’ Oβ‚‚ 
MnO₄⁻ β†’ Mn²⁺
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