UCL CENTRE FOR LANGUAGES
& INTERNATIONAL EDUCATION (CLIE)

UPC Placement Tests

Test: Chemistry 2



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1.

Which of the following is not a chemical element?

sulfur

air

magnesium

carbon

calcium

2.

Which of the following is a pure compound?

air

petrol

steel

glucose

sea water

3.

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

4.

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

5.

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

zinc

magnesium

iron

copper

aluminium

6.

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

7.

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

ethene

propane

methane

butane

octane

8.

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

9.

What is the chemical formula of sodium carbonate?

NaCO3

Na2CO3

Na(CO3)2

NaHCO3

NaNO3

10.

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?


11.

Water

12.

Methane

13.

Sodium

14.

Potassium bromide

15.

Which one of the following does not contain ions?

molten sodium chloride

lime water

glucose

hydrochloric acid

solid sodium chloride

16.

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

17.

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

18.

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

50 g

100 g

25 g

200 g

64 g

19.

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

4 g

8 g

12 g

16 g

20 g

20.

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

CH3

CH4

C2H6

C2H8

C6H24

21.

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

22.

The conversion of ethanol to ethanoic acid is an example of

dehydration

hydrolysis

oxidation

reduction

addition

23.

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


N2(g) + 3 H2(g) → 2 NH3(g)


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

14

40

120

360

30

24.

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.

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 cmof hydrochloric acid solution of concentration 0.025 mol dm-3

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

20 cmof 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:

26.

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

A

B

C

D

E

27.

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

A

B

C

D

E

28.

Which has the greatest relative molecular mass?

A

B

C

D

E

29.

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

30.

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