CHEMISTRY, M3 EQ-Bank 29v4

Write balanced chemical equations for each of the following reactions (states of matter are not required).

The reaction between aluminium and nitric acid. (1 mark)

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The decomposition of mercury (II) oxide. (1 mark)

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The complete combustion of pentane (\(\ce{C5H12}\)) with excess oxygen. (1 mark)

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The reaction between magnesium hydroxide and acetic acid (\(\ce{CH3COOH}\)). (1 mark)

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The reaction between calcium carbonate and hydrochloric acid. (1 mark)

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Show Answers Only

a. \(\ce{2Al + 6HNO3 -> 2Al(NO3)3 + 3H2}\)

b. \(\ce{2HgO -> 2Hg + O2}\)

c. \(\ce{C5H12 + 8O2 -> 5CO2 + 6H2O}\)

d. \(\ce{Mg(OH)2 + 2CH3COOH -> Mg(CH3COO)2 + 2H2O}\)

e. \(\ce{CaCO3 + 2HCl -> CaCl2 + CO2 + H2O}\)

Show Worked Solution

a. Active metal and acid

\(\ce{2Al + 6HNO3 -> 2Al(NO3)3 + 3H2}\)

b. Decomposition

\(\ce{2HgO -> 2Hg + O2}\)

c. Combustion

\(\ce{C5H12 + 8O2 -> 5CO2 + 6H2O}\)

d. Acid-base

\(\ce{Mg(OH)2 + 2CH3COOH -> Mg(CH3COO)2 + 2H2O}\)

e. Acid-carbonate

\(\ce{CaCO3 + 2HCl -> CaCl2 + CO2 + H2O}\)