A Level Chemistry B (Salters) H433/01 Fundamentals of Chemistry - Question Paper Tuesday 5 October 2021 Preview

A Level Chemistry B (Salters) H433/01 Fundamentals of Chemistry - Question Paper Tuesday 5 October 2021 Preview

SECTION A

You should spend a maximum of 40 minutes on this section.

Write your answer to each question in the box provided.

Answer all the questions.

1 Chlorine-35 is an isotope of chlorine.

What is correct about an atom of chlorine-35?

A It has 35 electrons.

B It has 35 neutrons.

C It has 35 protons.

D It has 35 protons plus neutrons.

Your answer [1]

2 What is meant by ‘heating to constant mass’?

A Heating a sample for a long time.

B Heating a sample, then weighing, then heating and weighing again several times.

C Weighing a sample several times after heating it.

D Weighing a sample several times before heating it.

Your answer [1]

3 Which of these provides evidence that electrons are arranged in shells within atoms?

A atomic spectra

B electrolysis

C the discovery of the neutron

D the Geiger-Marsden experiment

Your answer [1]

3

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4 Which equation represents the enthalpy change of formation of CO2?

A C(s) + 2O(g) CO2(g)

B C(s) + O2(g) CO2(g)

C CO(g) + 0.5O2(g) CO2(g)

D C(g) + O2(g) CO2(g)

Your answer [1]

5 What is correct about the polluting gases formed by a petrol engine?

A CO is formed by incomplete combustion of hydrocarbons and is toxic.

B CO2 is formed by combustion of hydrocarbons and can be removed by a catalytic converter.

C NOx is formed mainly when nitrogen compounds in petrol burn.

D SOx is formed by the combustion of dissolved sulfur in petrol.

Your answer [1]

6 What is correct about the greenhouse effect?

A Greenhouse gases are found in a thin layer in the Earth’s atmosphere.

B Infrared radiation causes bonds in greenhouse gases to break.

C The Earth absorbs more infrared radiation than it emits.

D Ultraviolet radiation is the main radiation absorbed by the Earth.

Your answer [1]

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7 Fe2+(aq) reacts with a mixture of S2O8

2– ions and I– ions in the following way:

S2O8

2–(aq) + 2Fe2+(aq) 2Fe3+(aq) + 2SO4

2–(aq)

then 2Fe3+(aq) + 2I–(aq) 2Fe2+(aq) + I2(aq)

What is correct?

A Fe2+(aq) is acting as a homogeneous catalyst.

B Fe2+(aq) is acting as an oxidising agent.

C I–(aq) ions are being reduced.

D S2O8

2–(aq) is acting as a reducing agent.

Your answer [1]

8 Which of these electron distributions is correct for an oxygen atom?

 1s 2s 2p

A

B

C

D

Your answer [1]

9 Element W is in Group 17 of the Periodic Table and element X is in Group 2.

What is correct?

A The outer sub-shell electron configuration of W is p5.

B The outer sub-shell electron configuration of X is p2.

C W and X react to form the compound WX2.

D X has 5 more electrons than W.

Your answer [1]

5

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10 Organic compound Y can be described as aliphatic, cyclic and unsaturated.

Which substance could be Y?

A benzene

B cyclohexane

C cyclohexene

D hexene

Your answer [1]

11 What is correct about catalysis?

A A catalyst poison slows a reaction without affecting the catalyst.

B A catalyst remains unchanged chemically at the end of the reaction.

C A catalyst speeds up a reaction but does not take part in the reaction.

D A heterogeneous catalyst is in the same state as the reactants.

Your answer [1]

12 What is correct about DNA?

A The backbone consists of a phosphate – base – phosphate sequence.

B The bases cytosine and guanine join by condensation reactions.

C The bases guanine and thymine pair by three hydrogen bonds.

D The monomers are nucleotides.

Your answer