set chemistry

7/29/2019 Set Chemistry

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

A. sulphur B. airC.

magnesiumD. 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 neutronsdoes the nucleus contain?

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

4) All elements in Group I have the sameA.

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.

magnesiumC. 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


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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) methaneA. B. C. D. E.

13) sodiumA. B. C. D. E.

14) potassium bromideA. 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 resultingsolution is greater than seven. Which one of the following could the element be?


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A. sulphurB.

phosphorus

C.

magnesiumD. 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 (atomicmass 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 ofthe 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 ofA.

dehydration

B.

hydrolysis

C. oxidation D. reduction E. addition

23) In the formation of ammonia from its elements in the gas phaseN2(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 ofcarbon 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


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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 29Compound 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

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

A. B. C. D. E.

27) ...for which two moles have a mass of 240 gA. B. C. D. E.

28) ...which has the greatest relative molecular massA. B. C. D. E.

29) ...which, if 80 g of the compound were dissolved in 1 dm3 water, would form a solution ofconcentration 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 sothat it is electrolysed.

A.

sodium is produced at the

cathode and chlorine at theanode

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


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