PHS Edexcel Triple Chemistry Paper 2 HIGHER (sample 1)

Which of the following is a correct statement about the relative amounts of carbon dioxide and oxygen in the Earth’s early atmosphere?

• large amount of carbon dioxide and large amount of oxygen

• large amount of carbon dioxide and small amount of oxygen

• small amount of carbon dioxide and large amount of oxygen

• small amount of carbon dioxide and small amount of oxygen

Describe how the composition of the atmosphere is affected by burning fossil fuels. (multiple answers)

• adds carbon dioxide

• removes oxygen

• adds nitrogen

• removes carbon dioxide

Which of these pairs of gases are both greenhouse gases?

• nitrogen and methane

• nitrogen and oxygen

• oxygen and water vapour

• water vapour and methane

Calcium reacts with water to form calcium hydroxide, Ca(OH)₂, and hydrogen, H₂.

Describe what would be seen when a piece of calcium is dropped into a container of water. (multiple answers)

• effervescence / fizzing

• cloudy / precipitate

• temperature change

• colour change

Magnesium reacts quickly with steam, H₂O, and forms magnesium oxide, MgO, and hydrogen

Which is the correct balanced equation for the reaction between magnesium and steam.

• Mg + H₂O → MgO + 2H

• 2Mg + H₂O → 2MgO + H₂

• Mg₂ + 2H₂O → 2MgO + 2H₂

• Mg + H₂O → MgO + H₂

The electronic configurations of magnesium and calcium are

magnesium 2.8.2

calcium 2.8.8.2

When magnesium and calcium react with water they form positive ions.

Suggest an explanation, in terms of their electronic configurations, why calcium is more reactive than magnesium.

• In calcium, the outermost electrons are further away from the nucleus, so are easier to remove

• In magnesium, the outermost electrons are further away from the nucleus, so are easier to remove

• In calcium, the outermost electrons are closer to the nucleus, so are harder to remove

• In magnesium, the innermost electrons are closer to the nucleus, so are easier to remove

A sample of calcium bromide contains 0.2g calcium and 0.8g bromine by mass.

Calculate the empirical formula of calcium bromide.

(relative atomic masses: Ca = 40, Br = 80)

• CaBr₂

• CaBr

• Ca₂Br

• Ca₂Br₂

Crude oil is a mixture of hydrocarbons. It can be separated into fractions.

Which of these mixtures shows formulae of substances that could be in the gaseous fraction of crude oil?

• C₂H₄, C₃H₈, C₄H₁₀O

• C₂H₄, C₃H₇Br, C₄H₁₀

• C₂H₆, C₃H₈, C₄H₁₀

• C₂H₆, C₃H₇Br, C₄H₁₀O

State which oil well contains the greatest combined total of diesel oil and fuel oil.

• Oil well A

• Oil well B

• Oil well C

State which oil well produces a crude oil containing the highest percentage of the high boiling point fractions.

• Oil well A

• Oil well B

• Oil well C