CHEMISTRY

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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
1 of 8
State the meaning of the term reduction.
{loss of / remove} oxygen
2 of 8
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
3 of 8
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)
4 of 8
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)
5 of 8
whats the percentage of carbon dioxide in the Earths atmosphere?
0.04
6 of 8
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)
7 of 8
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)
8 of 8

Other cards in this set

Card 2

Front

State the meaning of the term reduction.

Back

{loss of / remove} oxygen

Card 3

Front

Explain why the aluminium alloy is stronger than pure aluminium.

Back

Preview of the front of card 3

Card 4

Front

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

Back

Preview of the front of card 4

Card 5

Front

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

Back

Preview of the front of card 5
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