Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Crude Oil
106 practice questions
Topics covered
Practice questions
1–10 of 44 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State how long it takes for crude oil to form from the remains of sea plants and animals.
Question 2
3 marks · Easy
Answer and see the solution →Crude oil is an important natural resource. Answer all parts.
(a)[1 mark]State what crude oil is a mixture of.
(b)[1 mark]Give the names of the two elements found in all hydrocarbons in crude oil.
(c)[1 mark]Hydrocarbon molecules in crude oil have different sizes. Name one way in which large hydrocarbon molecules differ from small ones.
Question 3
2 marks · Easy
Answer and see the solution →Describe the process by which the soft parts of plants and animals in the sea are gradually converted into crude oil over time.
Question 4
3 marks · Easy
Answer and see the solution →The table shows four hydrocarbons found in crude oil. Use the data to answer the questions.
Physical properties of hydrocarbons in crude oil Hydrocarbon Number of carbon atoms Boiling point (°C) A 5 36 B 10 174 C 15 269 D 20 343 (a)[1 mark]Which hydrocarbon in the table has the highest boiling point?
(b)[1 mark]Describe the trend shown between the number of carbon atoms and boiling point.
(c)[1 mark]Predict the boiling point for a hydrocarbon with 12 carbon atoms, using the trend shown.
Question 5
1 mark · Easy
Answer and see the solution →Name one environmental problem caused by burning hydrocarbons from crude oil.
Question 6
3 marks · Easy
Answer and see the solution →Crude oil is formed over an extremely long period of time. Answer all parts.
(a)[1 mark]What happens to the remains of sea plants and animals after they die?
(b)[2 marks]State two conditions required for these remains to change into crude oil.
Question 7
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 8
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 9
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 10
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).