Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
81–90 of 317 · Easy
Question 81
2 marks · Easy
Answer and see the solution →A power station burns fuel oil that contains sulfur, forming 40 kg of sulfur dioxide in one day. Acid rain forms when sulfur dioxide reacts with rainwater. Calculate the mass of sulfur dioxide released if 300 kg of fuel oil is burned the next day, assuming the same rate of production. Show your working.
(a)[2 marks]Calculate your answer. Show working.
Question 82
2 marks · Easy
Answer and see the solution →Crude oil is a mixture containing many different hydrocarbons. A crude oil sample has molecules with an average of 10 carbon atoms for every hydrocarbon molecule. If another sample has 50 such molecules, calculate the total number of carbon atoms in this sample.
(a)[2 marks]Show your working.
Question 83
1 mark · Easy
Answer and see the solution →State one physical property that changes as the number of carbon atoms in a hydrocarbon increases.
Question 84
3 marks · Easy
Answer and see the solution →The table shows two hydrocarbon fractions obtained from crude oil.
(a)[1 mark]Hydrocarbon fractions Fraction Approx. number of carbon atoms Fuel gas 3 Lubricating oil 20 Which fraction is more viscous?
(b)[2 marks]Explain your answer to part (a).
Question 85
2 marks · Easy
Answer and see the solution →A scientist finds that a sample of kerosene starts to boil at 170 C, while a sample of diesel from the same crude oil boils at 280 C. Calculate the difference in boiling points between these two fractions.
Question 86
2 marks · Easy
Answer and see the solution →Explain why smaller hydrocarbons are used as fuels more often than larger hydrocarbons.
Question 87
3 marks · Easy
Answer and see the solution →The table shows information about three fractions from crude oil.
(a)[1 mark]Hydrocarbon fractions from crude oil Fraction Approx. number of carbon atoms Boiling point (°C) Petroleum gas 4 −1 Diesel 16 260 Bitumen 70 over 350 Which fraction is most volatile?
(b)[2 marks]Describe the relationship between the number of carbon atoms and boiling point for these fractions.
Question 88
1 mark · Easy
Answer and see the solution →State the colour of hydrocarbon fractions with the largest molecules.
Question 89
3 marks · Easy
Answer and see the solution →Fuel oil and gasoline (petrol) are both hydrocarbon fractions collected from crude oil.
(a)[1 mark]State which of the two fractions is expected to evaporate more quickly at room temperature.
(b)[2 marks]Give a reason for your answer to part (a).
Question 90
2 marks · Easy
Answer and see the solution →A sample of gasoline contains hydrocarbons with 8 carbon atoms per molecule. A sample of wax contains hydrocarbons with 30 carbon atoms per molecule. Calculate how many more carbon atoms per molecule are in wax than in gasoline.