CHEMISTRY

Created by: rachelbell
Created on: 29-04-14 17:41

most reactive calcium magnesium aluminium zinc iron copper least reactive gold (a) Which of these metals can be found as the uncombined metal in the Earth’s crust?

gold

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State the meaning of the term reduction.

{loss of / remove} oxygen

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Explain why the aluminium alloy is stronger than pure aluminium.

• (magnesium and aluminium) {atoms / ions / particles} are different sizes (1) • this prevents the layers (of atoms / ions / particles) sliding over each other

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When aluminium corrodes, it reacts with oxygen to form aluminium oxide, Al2O3. Complete the balancing of this equation by putting numbers in the spaces provided. (2) ................ Al + ................ O2

4 (Al) + 3 (O2 ) → (2Al2O3)

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Explain why it is difficult to be precise about the composition of the Earth’s early atmosphere.

nobody was there / OWTTE (1) • there are no (written) records / measurements (1)

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whats the percentage of carbon dioxide in the Earths atmosphere?

0.04

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Some hydrocarbon fuels can contain sulfur impurities. Explain how the product of combustion of these sulfur impurities affects the environment.

• sulfur dioxide formed (during combustion of fuel) (1) • sulfur dioxide {dissolves in rain / forms acid (rain)} (1) • an effect of acid rain e.g. harms {fish / plants / statues / buildings} / lowers pH of lakes (1)

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Both calcium carbonate and calcium oxide are white solids. Suggest how you could show that, when calcium carbonate is heated, a reaction takes place.

• {bubble / pass} the gas produced through limewater(1) • limewater turns {cloudy / milky} (1)

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