Beatty 7.1_Fuels WS1_2023_Answers

1 Beatty Secondary School Science Department (Chemistry Unit) Chemistry 6092 Name: ___________________________________ ( ) Date: _______________ Class: 4E1 TOPIC: FUELS AND CRUDE OIL (WORKSHEET 1) Learning Objectives: (a) Name natural gas, mainly methane, and petroleum as sources of energy. (b) Describe petroleum as a mixture of hydrocarbons and its separation into useful fractions by fractional distillation. (c) Name the following fractions and state their uses. (i) petrol (gasoline) as a fuel in cars (ii) naphtha as the feedstock and main source of hydrocarbons used for the production of a wide range of organic compounds in the petrochemical industry (iii) paraffin (kerosene) as a fuel for heating and cooking and for aircraft engines (iv) diesel as a fuel for diesel engines (v) lubricating oils as lubricants and as a source of polishes and waxes (vi) bitumen for making road surfaces (d) Describe the issues relating to the competing uses of oil as an energy source and as a chemical feedstock. Multiple-Choice Questions 1 Petroleum can be separated by fractional distillation because its constituents A are immiscible B have different densities C are highly flammable D have different boiling points ( D ) 2 Which of the following fractions of petroleum has the highest boiling point? A diesel B kerosene C bitumen D petroleum gas ( C ) 3 Which fuel, on combustion, does not form a pollutant? A petrol B natural gas C hydrogen D diesel ( C ) 4 Which of the following are arranged in order of increasing boiling points? A kerosene, petrol, diesel, bitumen B bitumen, diesel, kerosene, petrol C petrol, diesel, kerosene, bitumen D petrol, kerosene, diesel, bitumen ( D )

2 5 Which of these fractions has the most number of carbon atoms per molecule? A naphtha B diesel C petrol D lubricating oil ( D ) 6 The main constituent of natural gas is _____________. A butane B ethane C methane D petroleum gas ( C ) 7 The fractions obtained by fractional distillation of petroleum have different uses. Which fraction and use are correct? fraction use A bitumen fuel for lorries and buses B kerosene aircraft fuel C petrol making waxes D lubricating oil surfaces of roads ( B ) 8 At which outlet of the fractionati ng column below is the fuel used in gas cookers collected? ( A ) 9 Which statement about petroleum is true? A Petroleum can be separated by simple distillation. B Natural gas is a renewable source of energy. C Biodiesel is an alternative fuel to petroleum. D Biogas is produced when organic matter decays in air. ( C ) 10 Petroleum can be s eparated into f ractions using f ractional distillation. Which statements about petr