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N5 Chemistry Unit 1 MC 2015-2019 & 2022-2023

Total questions: 57

Worksheet time: 2hrs 54mins

Name
Class
Date
1.

The table shows the times taken for 0·5 g of magnesium to react completely with acid under different conditions. The time for 0·5 g of magnesium to react completely with 0·2 mol l−1 acid at 25 ºC will be

a)

less than 10 s

b)

between 10 s and 20 s

c)

between 20 s and 60 s

d)

more than 80 s

2.

In a reaction, the mass lost in 30 seconds was 2 g.

What is the average rate of reaction, in g s−1, over this time?

a)

130\frac{1}{30}

b)

302\frac{30}{2}

c)

12\frac{1}{2}

d)

230\frac{2}{30}

3.

Which of the following changes would not speed up a chemical reaction?

a)

Increasing the particle size

b)

Increasing the temperature

c)

Increasing the concentration

d)

Addition of a catalyst

4.

The volume of gas collected in 2 minutes was 5 cm3. What was the average rate of reaction over this time?

a)

0.2

b)

0.4

c)

2.5

d)

5.0

5.

The volume of gas collected in 2 minutes was 5 cm3. The unit for the average rate of this reaction is

a)

cm3/min−1

b)

cm3min−1

c)

min/cm3

d)

min cm−3

6.

The average rate of a chemical reaction was calculated to be 5 cm³ s⁻¹ for the first 60 s of the reaction. What volume of gas was collected in the first 60 s of the reaction?

a)

0.08 cm³

b)

12 cm³

c)

55 cm³

d)

300 cm³

7.

An atom has 26 protons, 26 electrons and 30 neutrons.

The atom has

a)

atomic number 26, mass number 56

b)

atomic number 56, mass number 30

c)

atomic number 30, mass number 26

d)

atomic number 52, mass number 56

8.

The table shows the numbers of protons, electrons and neutrons in four particles,

W, X, Y and Z. Which pair of particles are isotopes?

a)

W and X

b)

W and Y

c)

X and Y

d)

Y and Z

9.

Which of the following particles contains a different number of electrons from the others?

You may wish to use the data booklet to help you.

a)

Cl—

b)

S2—

c)

Ar

d)

Na+

10.

Which of the following diagrams could be used to represent the structure of a covalent

network?

a)

b)

c)

d)

11.

The table contains information about calcium and calcium chloride. When molten calcium chloride is electrolysed at 800 ºC the calcium appears as a

a)

solid at the bottom of the molten calcium chloride

b)

liquid at the bottom of the molten calcium chloride

c)

solid on the surface of the molten calcium chloride

d)

liquid on the surface of the molten calcium chloride

12.

When an atom X of an element in Group 1 reacts to become X+

a)

the mass number of X decreases

b)

the atomic number of X increases

c)

the charge of the nucleus increases

d)

the number of occupied energy levels decreases

13.

Which of the following structures is never found in compounds?

a)

Ionic

b)

Monatomic

c)

Covalent network

d)

Covalent molecular

14.

Which line in the table shows the properties of an ionic substance?

a)

A

b)

B

c)

C

d)

D

15.

What is the name of the compound with the formula Ag2O?

a)

Silver(I) oxide

b)

Silver(II) oxide

c)

Silver(III) oxide

d)

Silver(IV) oxide

16.

An atom has 21 protons, 21 electrons and 24 neutrons.

The atom has

a)

atomic number 24 and mass number 42

b)

atomic number 45 and mass number 21

c)

atomic number 21 and mass number 45

d)

atomic number 24 and mass number 45

17.

Which line in the table identifies the correct location of a proton and an electron in an atom?

a)

A

b)

B

c)

C

d)

D

18.

Which of the following elements does not exist as diatomic molecules?

a)

Oxygen

b)

Helium

c)

Bromine

d)

Hydrogen

19.

The shapes of some molecules are shown below. The shape of a molecule of hydrogen bromide is likely to be

a)

tetrahedral

b)

trigonal pyramidal

c)

angular

d)

linear

20.

Which of the following elements forms an ion with a single positive charge and an electron arrangement of 2,8?

You may wish to use the data booklet to help you.

a)

Sodium

b)

Magnesium

c)

Fluorine

d)

Neon

21.

Which line in the table shows the properties of a covalent network compound?

a)

A

b)

B

c)

C

d)

D

22.

0·1 mol of sodium hydroxide was dissolved in water and the solution made up to 250 cm3.

What is the concentration, in mol l-1, of the sodium hydroxide solution?

a)

0·0004

b)

0·025

c)

0·4

d)

2·5

23.

Tennessine is a newly discovered element with a predicted electron arrangement of

2,8,18,32,32,18,7.

In which group of the periodic table should Tennessine be placed?

a)

1

b)

2

c)

7

d)

8

24.

Which of the following is a positively charged ion?

a)

A

b)

B

c)

C

d)

D

25.

A molecule of phosphorus trifluoride is shown. Which term can be used to describe the shape of a phosphorus trifluoride molecule?

a)

Linear

b)

Angular

c)

Tetrahedral

d)

Trigonal pyramidal

26.

In which of the following compounds do the ions have the same electron arrangement?

You may wish to use the data booklet to help you.

a)

Na2O

b)

LiF

c)

KBr

d)

MgCl2

27.

In which experiment would the bulb light?

a)

A

b)

B

c)

C

d)

D

28.

Which of the following is the atomic number of a metal?

a)

1

b)

33

c)

45

d)

86

29.

An atom is neutral because:

a)

the number of protons equals the number of neutrons

b)

the number of electrons equals the number of protons

c)

the number of electrons equals the number of protons plus neutrons

d)

the number of neutrons equals the number of electrons plus protons.

30.

When liquid water changes to steam:

a)

weak forces of attraction between the water molecules are broken

b)

strong forces of attraction between the water molecules are broken

c)

weak forces of attraction between the atoms in the water molecules are broken

d)

strong forces of attraction between the atoms in the water molecules are broken.

31.

Which of the following structures would be described as angular?

a)

b)

c)

Structure C

d)

Structure D

32.

Which line in the table correctly describes a proton?

a)

A

b)

B

c)

C

d)

D

33.

Which of the following compounds forms molecules with an angular structure?

a)

CCl₄

b)

NCl₃

c)

SCl₂

d)

FCl

34.

Which of the following diagrams could be used to represent the structure of lithium fluoride?

a)

b)

c)

d)

35.

What is the charge on the chromium ion in CrCl3?

a)

1+

b)

1-

c)

3+

d)

3-

36.

x Al(s) + yBr2(l) → z AlBr3(s)

This equation will be balanced when

a)

x = 1, y = 2 and z = 1

b)

x = 2, y = 3 and z = 2

c)

x = 3, y = 2 and z = 3

d)

x = 4, y = 3 and z = 4

37.

When solid sodium chloride dissolves in water, a solution containing sodium ions and

chloride ions is formed.

Which of the following equations correctly shows the state symbols for this process?

a)

b)

c)

d)

38.

What is the charge on the zinc ion in zinc dichromate, ZnCr2O7?

You may wish to use the data booklet to help you.

a)

2+

b)

2-

c)

1+

d)

1-

39.

AgNO3(aq) + KCl(aq) --> AgCl(s) + KNO3(aq)

Which of the following are the spectator ions in this reaction?

a)

Ag+ and Cl−

b)

K+ and NO3−

c)

Ag+ and NO3−

d)

K+ and Cl−

40.

x H2O2 --> y H2O + z O2

This equation will be balanced when

a)

x = 1, y = 2 and z = 2

b)

x = 1, y = 1 and z = 2

c)

x = 2, y = 2 and z = 1

d)

x = 2, y = 2 and z = 2

41.

Which of the following solutions contains the least number of moles of solute?

a)

100 cm3 of 0·4 mol l−1 solution

b)

200 cm3 of 0·3 mol l−1 solution

c)

300 cm3 of 1·0 mol l−1 solution

d)

400 cm3 of 0·5 mol l−1 solution

42.

0·25 moles of a gas has a mass of 7 g.

Which of the following could be the molecular formula for the gas?

a)

C2H6

b)

C2H4

c)

C3H8

d)

C3H6

43.

Ammonium nitrate, NH4NO3, has a gram formula mass of 80.

The percentage by mass of nitrogen in ammonium nitrate is equal to

a)

b)

c)

d)

44.

In which of the following compounds does the iron ion have a 3+ charge? You may wish to use the data booklet to help you.

a)

FeO

b)

FeP

c)

Fe(NO3)2

d)

Fe3(PO4)2

45.

Which solution contains the least number of moles of solute?

a)

100 cm³ of 1.00 mol l⁻¹

b)

150 cm³ of 0.75 mol l⁻¹

c)

200 cm³ of 0.60 mol l⁻¹

d)

250 cm³ of 0.25 mol l⁻¹

46.

Which of the following oxides, when shaken with water, would leave the pH unchanged?

You may wish to use the data booklet to help you.

a)

Carbon dioxide

b)

Copper oxide

c)

Sodium oxide

d)

Sulfur dioxide

47.

Which compound would not neutralise hydrochloric acid?

a)

Sodium carbonate

b)

Sodium chloride

c)

Sodium hydroxide

d)

Sodium oxide

48.

An element was burned in air. The product was added to water, producing a solution with a

pH less than 7. The element could be

a)

tin

b)

zinc

c)

sulfur

d)

sodium

49.

Which of the following compounds is a base?

a)

Sodium carbonate

b)

Sodium chloride

c)

Sodium nitrate

d)

Sodium sulfate

50.

An alkaline solution contains

a)

only hydroxide ions

b)

more hydroxide ions than hydrogen ions

c)

more hydrogen ions than hydroxide ions

d)

equal numbers of hydrogen ions and hydroxide ions

51.

A student made some statements about the effect of adding water to an acidic solution.

Identify the correct statement.

a)

The pH of the solution will remain the same.

b)

The pH of the solution will decrease.

c)

The hydrogen ion concentration will decrease.

d)

The hydrogen ion concentration will increase.

52.

As an alkaline solution is diluted with water

a)

the pH increases

b)

the pH stays the same

c)

the concentration of hydroxide ions increases

d)

the concentration of hydroxide ions decreases

53.

Which of the following compounds is a base?

a)

Sodium oxide

b)

Calcium chloride

c)

Potassium nitrate

d)

Ammonium sulfate

54.

Which of the following compounds is a salt?

a)

Calcium oxide

b)

Hydrogen nitrate

c)

Sodium hydroxide

d)

Potassium ethanoate

55.

Which of the following substances, when shaken with water, would cause the pH of water to increase? You may wish to use the data booklet to help you.

a)

Aluminium oxide

b)

Barium oxide

c)

Nitrogen oxide

d)

Hydrogen oxide

56.

Nickel carbonate, nickel hydroxide and nickel metal all react with dilute sulfuric acid. Which of the following statements is true for all three reactions?

a)

A gas is produced.

b)

Water is produced.

c)

Nickel sulfate is produced.

d)

A neutralisation reaction takes place.

57.

Sodium carbonate can be used to neutralise hydrochloric acid. The correct equation omitting the spectator ions is

a)

H⁺(aq) + OH⁻(aq) → H₂O(ℓ)

b)

2H⁺(aq) + CO₃²⁻(aq) → H₂O(ℓ) + CO₂(g)

c)

2H⁺(aq) + CO₃²⁻(g) → H₂O(ℓ) + CO₂(g)

d)

Na⁺(aq) + Cl⁻(aq) → NaCl⁻(aq)

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