05 May Are you able to answer this Secondary Chemistry Tuition Question?(Part 6)
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
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|
30 A student adds marble chips to hydrochloric acid.
The mass of flask and contents is measured at regular time intervals.
Which graph shows the result?
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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