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Try Old O-Level Questions

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Published at 6:03am 21st June 2012 (Updated 5:36am 22nd June 2012)

Here are some old O-Level questions:

 

Question One: 10dm3 of nitrous  oxide (dinitrogen monoxide) are passed over heated copper and the gas formed is collected. If the reaction goes to completion and all volumes are measured at r.t.p. (room temperature and pressure) what is the volume of the gas collected and the mass of the copper (II) oxide former? (Relative atomic mass Cu – 64). One mole of any ideal gas occupies 24dm3 at r.t.p.

 

Question Two: 1.0dm3 of ammonia was passed over heated copper (II) oxide (Cu0). The nitrogen formed (measured at the same temperature and pressure as the ammonia) would have a volume of:

a) 250cm3

b) 500cm3

c) 750cm3

d) 1,000cm3

e) 2,000cm3

 

Question Three: Rewrite two of the following sentences in order to remove any errors.

(i) Uncle Tom has agreed to share his money between you and I.
(ii) The dog had hurt it's paw.
(iii) The number of accidents on the road are increasing.
 

And GCSE question from now:

Question Four: The formula of magnesium chloride is MgCl2. Calculate the relative formula mass of magnesium chloride. (Relative atomic masses: Cl = 35.5; Mg – 24)

 

Question Five: Here is a list of numbers - 3 - 7 - 8 - 10 - 16 - 24 - 26

a) Write a multiple of six

b) Write a square number

c) Write a factor of 12

d) Write a cube number.

 

Question Six: Solve the equation

2x + 3 - 2x - 8 = 1

x - 4 2x + 1

Question Seven:

What happens to a liquid during its separation from a mixture by distillation?

a) Condensing followed by evaporating
b) Evaporating followed by condensing
c) Evaporating followed by freezing

 

(Answers: Question 1. Volume = 10dm3, Mass = 33.3g. Question 2: b). Question 3: you and me; its; is increasing. Question 4: (2 x 35.5) = 24 = 95g. Question 5: a) 24 b) 16 c) 3 d)8. Question 6: 0.81 Question 7: Evaporating followed by condensing.)

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