CIE iGCSE Co-Ordinated Science C11.3 Fuels Exam Style Questions Paper 4
Question
Petroleum is a mixture of hydrocarbons.
(a) State what is meant by a hydrocarbon.
(b) Petroleum can be separated into useful fractions by fractional distillation.
Fig. 2.1 shows a fractionating column.
(i) On Fig. 2.1, write the letter X in the coolest part of the fractionating column.
(ii) Fractional distillation separates petroleum into fractions containing substances with similar properties.
State the names of two of these properties.
……………………………….and …………………. .
(c) Methane, CH4, is obtained from fractional distillation of petroleum.
In the complete combustion of methane, methane reacts with oxygen, O2.
Carbon dioxide and water are made.
Construct the balanced symbol equation for the complete combustion of methane.
(d) The reaction between methane and oxygen is exothermic.
State what is meant by the term exothermic.
▶️Answer/Explanation
Ans :
2(a) (compound containing) carbon and hydrogen (atoms) ;
only ;
2(b)(i) X inside the column, either inside the pipe or anywhere above the top dotted line ;
e.g.
2(b)(ii) Any two from:
boiling point / volatility / viscosity / flammability / density ;;
2(c) CH4 + 2O2 → CO2 + 2H2O ;;
2(d) Idea of thermal energy given out ;