O Level | IP Chemistry Tuition – Are you able to answer this Secondary Chemistry Tuition Question?

05 May O Level | IP Chemistry Tuition – Are you able to answer this Secondary Chemistry Tuition Question?

29        The molar heat of combustion, i.e. the heat given out when one mole of the alcohol is completely burned in oxygen, of a number of alcohols is given below.

alcohol formula heat of combustion
kJ/mol
methanol
ethanol
propanol
butanol
CH3OH
C2H5OH
C3H7OH
C4H9OH
750
1380
2010
2640

How many carbon and hydrogen atoms would there be in an alcohol that has a molar heat of combustion of 3900 kJ / mol?

number of carbon atoms number of hydrogen atoms
A
B
C
D
5
5
6
6
11
12
13
14

 

30        A student adds marble chips to hydrochloric acid.

chemistry_tuition_q

 

The mass of flask and contents is measured at regular time intervals.

Which graph shows the result?

chemistry_tuition_q

 

31        Which salt can be prepared by an acid-alkali titration method?

 

A          ammonium sulphate

B          copper(II) sulphate

C          iron(II) sulphate

D          zinc sulphate

 

32        Which pair of substances produces a precipitate when their aqueous solutions are mixed?

 

A          barium nitrate, silver nitrate

B          sodium chloride, barium nitrate

C          sodium nitrate, barium chloride

D          sodium sulphate, barium chloride

 

 

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Did you answer the Secondary Chemistry Tuition Question correctly?

 

29.D

30.A

31.A

32.D

 

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