Which of the following is not a chemical element?

sulfur

air

magnesium

carbon

calcium

Which of the following is a pure compound?

air

petrol

steel

glucose

sea water

The nucleus of an atom with atomic number 17 has a mass number of 37. How many neutrons does the nucleus contain?

17

37

74

19

20

All elements in Group I have the same

atomic mass

atomic number

mass number

number of electron shells

number of electrons in the outer energy level of the atom

Which one of the following metals does not react with hydrochloric acid?

zinc

magnesium

iron

copper

aluminium

Which one of the following will displace bromine from a solution of potassium bromide?

iodine

potassium chloride solution

chlorine

potassium iodide solution

potassium fluoride solution

Which compound is not in the same homologous series as ethane?

ethene

propane

methane

butane

octane

Which of the following pairs of substances are isomers?

³⁵Cl and ³⁷Cl

carbon monoxide and carbon dioxide

hexane and cyclohexane

butane and methylpropane

diamond and graphite

What is the chemical formula of sodium carbonate?

NaCO₃

Na₂CO₃

Na(CO₃)₂

NaHCO₃

NaNO₃

Which of the following is the balanced equation for the reaction of sodium with water?

Na(s) + H₂O(l) → NaoH(aq) + H₂(g)

2 Na(s) + H₂O(l) → NaOH(aq) + H₂(g)

2 Na(s) + H₂O(l) → 2 NaOH(aq) + H₂(g)

2 Na(s) + 2 H₂O(l) → 2 NaOH(g) + H₂(g)

2 Na(s) + 2 H₂O(l) → 2 NaOH(aq) + H₂(g)

Questions 11 - 14

Substances can exist in each of the following forms:

            A. freely moving molecules

            B. molecules held together by weak intermolecular forces

            C. a giant lattice of covalently bonded atoms

            D. positively charged ions surrounded by a "sea" of delocalised electrons

            E. a giant lattice of oppositely charged ions

Which one of the following attractions listed  from A to E,  are present at room temperature in/between the molecules given below?

Water

A

B

C

D

E

Methane

A

B

C

D

E

Sodium

A

B

C

D

E

Potassium bromide

A

B

C

D

E

Which one of the following does not contain ions?

molten sodium chloride

lime water

glucose

hydrochloric acid

solid sodium chloride

An element burns in oxygen to form a solid oxide which dissolves in water. The pH of the resulting solution is greater than seven.

Which one of the following could the element be?

sulphur

phosphorus

magnesium

sodium

carbon

Which of the following solutions, all of the same concentration, would have the highest pH value?

ethanoic acid

ammonium chloride solution

water

sodium hydroxide solution

hydrochloric acid

What is the mass of 0.5 moles of calcium carbonate, CaCO₃?

50 g

100 g

25 g

200 g

64 g

What mass of sulfur contains the same number of atoms as 3 g carbon?

4 g

8 g

12 g

16 g

20 g

An alkane contains 75% carbon by mass. Which one of the following is its empirical formula?

CH₃

CH₄

C₂H₆

C₂H₈

C₆H₂₄

An element M forms an oxide that contains 6.4 g of M and 0.8 g of oxygen. What is the formula of the oxide?

MO

MO₂

M₂O

M₂O₃

M₂O₄

The conversion of ethanol to ethanoic acid is an example of

dehydration

hydrolysis

oxidation

reduction

addition

In the formation of ammonia from its elements in the gas phase:

N₂(g) + 3 H₂(g) → 2 NH₃(g)

What volume in dm³ of hydrogen would be required to react exactly with 120 dm³ nitrogen?

14

40

120

360

30

If 25 cm³ of ethane were burned in an excess of oxygen, which one of the following volumes of carbon dioxide would be formed?

(All volumes measured at the same temperature and pressure.)

2 C₂H₆(g)  +  7 O₂(g) →  4 CO₂(g)  +  6 H₂O(l)

4 cm³

20 cm³

25 cm³

40 cm³

50 cm³

25 cm³ of sodium hydroxide solution of concentration 1.0 mol dm^-3 is exactly neutralised by:

25 cm³ of hydrochloric acid solution of concentration 0.5 mol dm^-3

50 cm³ of hydrochloric acid solution of concentration 1.0 mol dm^-3

100 cm³ of hydrochloric acid solution of concentration 0.025 mol dm^-3

25 cm³ of hydrochloric acid solution of concentration 1.5 mol dm^-3

20 cm³ of hydrochloric acid solution of concentration 1.25 mol dm^-3

Questions 26 – 29

Compound                        Mass (g)                        Number of moles

        A                                     40                                        0.2
                      
        B                                     40                                        0.25

        C                                     60                                        0.5

        D                                     80                                        0.2
                      
        E                                     80                                        2.0


Select from the above list of compounds:

Which has a relative molecular mass of 160 g mol^-1?

A

B

C

D

E

For which compound two moles have a mass of 240 g?

A

B

C

D

E

Which has the greatest relative molecular mass?

A

B

C

D

E

Which, if 80 g of the compound were dissolved in 1 dm³ water, would form a solution of concentration 0.5 mol dm^-3?

A

B

C

D

E

When a low voltage electric current is passed through an aqueous solution of sodium chloride so that it is electrolysed.

Which statement does correctly describe a process on one of the electrodes?

sodium is produced at the cathode and chlorine at the anode

sodium is produced at the anode and sodium at the cathode

hydrogen is produced at the cathode and chlorine at the anode

chlorine is produced at the cathode and hydrogen at the anode

sodium is produced at the cathode and hydrogen at the anode