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UCL Undergraduate Preparatory Certificate for Science & Engineering

Chemistry - Sample Test



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1) Which of the following is not a chemical element?

A. sulphur
B. air
C. magnesium
D. carbon
E. calcium


2) Which of the following is a pure compound?

A. air
B. petrol
C. steel
D. glucose
E. 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?

A. 17
B. 37
C. 74
D. 19
E. 20


4) All elements in Group I have the same

A.
atomic mass
B.
atomic number
C.
mass number
D.
number of electron shells
E.
number of electrons in the outer energy level of the atom


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

A. zinc
B. magnesium
C. iron
D. copper
E. aluminium


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

A. iodine
B. potassium chloride solution
C. chlorine
D. potassium iodide solution
E. potassium fluoride solution


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

A. ethene
B. propane
C. methane
D. butane
E. octane


8) Which of the following pairs of substances are isomers?

A.
35Cl and 37Cl
B.
carbon monoxide and carbon dioxide
C.
hexane and cyclohexane
D.
butane and methylpropane
E.
diamond and graphite


9) What is the chemical formula of sodium carbonate?

A. NaCO3
B. Na2CO3
C. Na(CO3)2
D. NaHCO3
E. NaNO3


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

A.
Na(s) + H2O(l) =
NaoH(aq) + H2(g)
B.
2Na(s) + H2O(l) =
NaOH(aq) + H2(g)
C.
2Na(s) + H2O(l) =
2NaOH(aq) + H2(g)
D.
2Na(s) + 2H2O(l) =
2NaOH(g) + H2(g)
E.
2Na(s) + 2H2O(l) =
2NaOH(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, listed A to E,  are present at room temperature in?

11) water

A.
B.
C.
D.
E.


12) methane

A.
B.
C.
D.
E.


13) sodium

A.
B.
C.
D.
E.


14) potassium bromide

A.
B.
C.
D.
E.


15) Which one of the following does not contain ions?

A.
molten sodium chloride
B.
lime water
C.
glucose
D.
hydrochloric acid
E.
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?

A. sulphur
B. phosphorus
C. magnesium
D. sodium
E. carbon


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

A. ethanoic acid
B. ammonium chloride solution
C. water
D. ammonium hydroxide solution
E. hydrochloric acid


18) What is the mass of 0.5 moles of calcium carbonate, CaCO3 (atomic masses: Ca = 40, C = 12, O = 16 )?

A. 50g
B. 100g
C. 25g
D. 200g
E. 64g


19) What mass of sulphur (atomic mass 32) contains the same number of atoms as 3g carbon (atomic mass 12)

A. 4g
B. 8g
C. 12g
D. 16g
E. 20g


20) An alkane contains 75% carbon by mass. Which one of the following is its empirical formula? (Atomic masses C = 12, H = 1)

A. CH3
B. CH4
C. C2H6
D. C2H8
E. C6H24

21) An element M forms and oxide that contains 6.4g of M and 0.8g of oxygen. What is the formula of the oxide? (atomic masses: M= 64, O = 16)

A. MO
B. MO2
C. M2O
D. M2O3
E. M2O4


22) The conversion of ethanol to ethanoic acid is an example of

A. dehydration
B. hydrolysis
C. oxidation
D. reduction
E. addition


23) In the formation of ammonia from its elements in the gas phase

N2(g) + 3H2 (g) = 2NH3 (g)

What volume in dm3of hydrogen would be required to react exactly with 120 dm3 nitrogen?

A. 14
B. 40
C. 120
D. 360
E. 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.)

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

A. 4cm3
B. 20cm3
C. 25cm3
D. 40cm3
E. 50cm3


25) 25 cm3 of sodium hydroxide solution of concentration 1.0 mol/dm3 is exactly neutralised by

A.
25 cm3 of hydrochloric acid solution of concentration 0.5 mol/dm3
B.
50 cm3 of hydrochloric acid solution of concentration 1.0 mol/dm3
C.
100 cm3 of hydrochloric acid solution of concentration 0.025 mol/dm3
D.
25 cm3 of hydrochloric acid solution of concentration 1.5 mol/dm3
E.
20 cm3 of hydrochloric acid solution of concentration 1.25 mol/dm3


Questions 26 – 29

Compound
Mass (g)
Number of moles
A
B
C
D
E
40
40
60
80
80
0.2
0.25
0.5
0.2
2.0

Select from the list the compound...

26) ...which has a relative molecular mass of 160?

A.
B.
C.
D.
E.


27) ...for which 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/dm3

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.

A.
sodium is produced at the cathode and chlorine at the anode
B.
sodium is produced at the anode and sodium at the cathode
C.
hydrogen is produced at the cathode and chlorine at the anode
D.
chlorine is produced at the cathode and hydrogen at the anode
E.
sodium is produced at the cathode and hydrogen at the anode