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CHEMISTRY PAPER 1 (NO. 2)

By Mumba / March 10, 2023

CHEMISTRY (Topical notes with Questions & Answers) CHEMISTRY FULL EXAM PAPERS WITH ANSWERS CHEMISTRY PAPER 1 (NO. 2)

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Question 1 of 40

1. Question
Which process is used in the preparation of soluble salts?
- electrolysis
- evaporation
- melting
- precipitation
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Question 2 of 40

2. Question
Which positive ions are present in aqueous copper(II) sulfate?
- copper ions only
- copper ions and hydrogen ions
- sulfate ions only
- sulfate ions and hydroxide ions
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Question 3 of 40

3. Question
In a titration between an acid (in the burette) and an alkali, you may need to re-use the same
titration flask.
Which is the best procedure for rinsing the flask?
- Rinse with distilled water and then with the alkali.
- Rinse with tap water and then with distilled water.
- Rinse with tap water and then with the acid.
- Rinse with the alkali.
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Question 4 of 40

4. Question
Two containers, one of methane and one of butane, are placed at the same distance from a
naked flame.
Both gases are released at the same time. The methane gas reaches the flame and catches fire
before the butane gas reaches the flame.
Which statement explains this?
- Each methane molecule has a higher proportion of hydrogen than each butane molecule.
- Methane does not have isomers, butane does have isomers.
- Methane has a higher boiling point than butane.
- Methane molecules have a smaller mass than butane molecules.
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Question 5 of 40

5. Question
Metal X oxidises in air. The formula of the oxide is XO.
X displaces zinc from aqueous zinc nitrate.
Which could be X?
- aluminium
- lead
- magnesium
- sodium
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Question 6 of 40

6. Question
Which is a compound?
- air
- carbon
- oxygen
- steam
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Question 7 of 40

7. Question
How is a calcium ion, Ca2+, formed from a calcium atom?
- by gaining two electrons
- by gaining two protons
- by losing two electrons
- by losing two protons
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Question 8 of 40

8. Question
An oxygen atom contains 8 electrons, 8 protons and 10 neutrons.
What is the nucleon number of this atom?
- 8
- 10
- 16
- 18
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Question 9 of 40

9. Question
A molecule of sulfuric acid has the structural formula shown.

How many electrons are involved in forming all the covalent bonds in one molecule?
- 6
- 8
- 12
- 16
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Question 10 of 40

10. Question
A metal consists of a lattice of positive ions in a ‘sea of electrons’.
What happens to the electrons and positive ions in a metal wire when an electric current is
passed through it?
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Question 11 of 40

11. Question
The equation shown represents the neutralisation of aqueous sodium hydroxide with dilute
sulfuric acid.

How much sulfuric acid is required to neutralise 100 cm3 of 1.0 mol / dm3 NaOH?
- 50 cm3 of 2.0 mol / dm3 sulfuric acid
- 100 cm3 of 1.0 mol / dm3 sulfuric acid
- 25 cm3 of 0.5 mol / dm3 sulfuric acid
- 50 cm3 of 1.0 mol / dm3 sulfuric acid
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Question 12 of 40

12. Question
Which change in conditions increases the energy of particles in a reaction?
- increase in concentration
- increase in pressure
- increase in temperature
- presence of a catalyst
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Question 13 of 40

13. Question
Which change is endothermic?
- CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)
- H(g) + Cl (g) → HCl (g)
- H2O(g) → 2H(g) + O(g)
- H2O(l) → H2O(s)
Correct

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Question 14 of 40

14. Question
The enthalpy changes when methane, butane and octane are burned completely in oxygen are
shown below.

Which are the enthalpy changes when propane and pentane are burned completely in oxygen?
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Question 15 of 40

15. Question
In the ionic solid zinc phosphide, Zn3P2, what is the formula of the phosphide ion?
- P3–
- P3+
- P4–
- P2+
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Question 16 of 40

16. Question
Iron is produced in the blast furnace.

Which statement about this process is correct?
- Carbon is oxidised to carbon dioxide.
- Carbon monoxide is produced by the thermal decomposition of calcium carbonate.
- Haematite is reduced by calcium carbonate.
- Impurities are removed by the hot air blast.
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Question 17 of 40

17. Question
The energy profile diagram for a reaction is shown.
products

energy
progress of reaction
reactants
Which statement is correct?
- The activation energy of the reaction is (H3 − H1).
- The activation energy of the reaction is (H3 − H2).
- ∆H is (H1 − H2).
- ∆H is (H1 − H3).
Correct

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Question 18 of 40

18. Question
In which reaction is nitric acid acting as an oxidising agent?
- Cu + 4HNO3 → Cu(NO3)2 + 2H2O + 2NO2
- CuO + 2HNO3 → Cu(NO3)2 + H2O
- Na2CO3 + 2HNO3 → 2NaNO3 + H2O + CO2
- NaOH + HNO3 → NaNO3 + H2O
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Question 19 of 40

19. Question
Which occurs during the electrolysis of dilute sulfuric acid?
- Hydrogen and oxygen are formed in the ratio two volumes of oxygen to one volume of hydrogen.
- Hydrogen is formed at the positive electrode.
- Oxide ions are oxidised to oxygen.
- The dilute sulfuric acid becomes more concentrated
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Question 20 of 40

20. Question
Methanol is made in industry by a reaction between carbon monoxide and hydrogen.

The process is usually carried out at a temperature of 400 °C.
Which row correctly shows the effect on both the position of the equilibrium and on the rate of the
reaction of increasing the temperature to above 400 °C?
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Question 21 of 40

21. Question
Which statement about graphite is not correct?
- It burns to form carbon dioxide.
- It is a carbon compound.
- It is a giant molecular substance.
- It is used as a lubricant.
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Question 22 of 40

22. Question
Ammonium nitrate, NH4NO3, is an artificial fertiliser produced from ammonia.
What is an advantage of using ammonium nitrate as a fertiliser?
- It contains a large percentage by mass of nitrogen.
- It gives off ammonia gas.
- Nitrates are insoluble.
- Nitrates can cause eutrophication.
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Question 23 of 40

23. Question
Four metals and hydrogen are arranged in order of decreasing reactivity.

Which statement about these elements is correct?
- Aluminium is formed when aluminium oxide is heated with hydrogen.
- Copper displaces zinc from zinc sulfate solution.
- Copper is formed when copper(II) oxide is heated with hydrogen.
- When added to water, aluminium forms positive ions more readily than potassium
Correct

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Question 24 of 40

24. Question
Which pair of substances reacts to form a salt and water only?
- aqueous sodium chloride and aqueous silver nitrate
- aqueous sodium hydroxide and dilute ethanoic acid
- aqueous sodium carbonate and dilute sulfuric acid
- zinc and dilute hydrochloric acid
Correct

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Question 25 of 40

25. Question
An element is burned in an excess of oxygen.
Which statement about the oxide formed is always correct?
- The mass of oxide formed is greater than the mass of element burned.
- The oxide formed is a crystalline solid.
- The oxide formed is soluble in water.
- The oxide formed is white in colour.
Correct

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Question 26 of 40

26. Question
Which reaction does not involve neutralisation?
- H2SO4(aq) + 2NH3(aq) → (NH4)2SO4(aq)
- H2SO4(aq) + BaCl 2(aq) → BaSO4(s) + 2HCl (aq)
- H2SO4(aq) + CuO(s) → CuSO4(aq) + H2O(l)
- H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)
Correct

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Question 27 of 40

27. Question
Which element described in the table is a transition metal?
Correct

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Question 28 of 40

28. Question
Three different elements react by losing electrons. The ions formed all have the electronic
configuration 2,8.
Which statement about these elements is correct?
- They are in the same group.
- They are in the same period.
- They are noble gases.
- They are transition elements
Correct

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Question 29 of 40

29. Question
An alloy of aluminium is used in the construction of aircraft.
Why is pure aluminium never used?
- Pure aluminium cannot be manufactured.
- Pure aluminium conducts electricity.
- Pure aluminium is less dense than its alloys.
- Pure aluminium is too malleable.
Correct

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Question 30 of 40

30. Question
What happens when a strip of silver is immersed in an aqueous solution of copper(II) sulfate?
- Bubbles of gas will appear.
- No reaction occurs.
- Pink copper will be deposited on the silver strip.
- The silver strip will start to dissolve.
Correct

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Question 31 of 40

31. Question
The flow chart shows how impure water can be treated to produce drinkable water.

What is not removed from the water by this process?
- clay particles
- microbes
- nitrates
- odours
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Question 32 of 40

32. Question
Which property of a liquid ester can be used to check its purity before use as a food flavouring?
- boiling point
- colour
- smell
- solubility in water
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Question 33 of 40

33. Question
Which alcohol will, on oxidation, produce CH3CH2CO2H?
- CH3OH
- CH3CH2OH
- CH3CH2CH2OH
- HOCH2CH2CH2OH
Correct

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Question 34 of 40

34. Question
The diagram shows the structure of an organic acid.

Which row is correct?
Correct

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Question 35 of 40

35. Question
A carbohydrate such as starch can be represented as shown.

What is X?
- carbon
- hydrogen
- nitrogen
- oxygen
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Question 36 of 40

36. Question
P is a polymer that
●
has six carbon atoms in each of the monomers from which it was formed,
●
is not a polyester,
●
was formed using condensation polymerisation.
What is the partial structure of P?
Correct

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Question 37 of 40

37. Question
What are the products of photosynthesis?
- carbon dioxide and oxygen
- carbon dioxide and water
- glucose and water
- glucose and oxygen
Correct

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Question 38 of 40

38. Question
Which diagram shows the structure of an alloy?
Correct

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Question 39 of 40

39. Question
Hydrogen and nitrogen react to form ammonia.

Which statement is correct?
- Ammonia is made in industry by the Contact process.
- Ammonia is used in industry to make hydrogen and nitrogen.
- Hydrogen, for the forward reaction, is obtained from cracking oil.
- Weed killers are manufactured from ammonia.
Correct

Incorrect
Question 40 of 40

40. Question
Which statement about the hydrocarbon C2H4 is not correct?
- It contains a double bond.
- It decolourises bromine water.
- It forms a condensation polymer.
- It forms an alcohol when reacted with steam.
Correct

Incorrect

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