Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
191–200 of 785
Question 191
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 192
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 193
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 194
2 marks · Normal
Answer and see the solution →State what crude oil is and name the two elements found in all hydrocarbons in crude oil.
Question 195
4 marks · Normal
Answer and see the solution →Crude oil and its products can cause environmental harm. Answer all parts.
(a)[1 mark]State one gas released from burning hydrocarbons that causes acid rain.
(b)[1 mark]Explain how acid rain is formed from the burning of hydrocarbons.
(c)[1 mark]Describe one effect of acid rain on the environment.
(d)[1 mark]Apart from acid rain, state one other problem caused by burning hydrocarbons.
Question 196
3 marks · Normal
Answer and see the solution →Crude oil takes millions of years to form. Suppose a layer of organic material is buried under sediment for 60 million years. If the process began 350 million years ago, calculate how many years ago the crude oil finished forming. Show your working.
Question 197
3 marks · Normal
Answer and see the solution →Explain why crude oil can be separated by physical methods, and not by chemical methods.
Question 198
4 marks · Normal
Answer and see the solution →A table below shows the amount of sulfur dioxide and carbon dioxide released by burning different fuels:
Fuel Sulfur dioxide released (g) Carbon dioxide released (g) Petrol 7 115 Diesel 20 124 Natural gas 0 95 (a)[1 mark]Which fuel releases the most sulfur dioxide? State your answer.
(b)[1 mark]Which fuel produces no sulfur dioxide? State your answer.
(c)[1 mark]Suggest one environmental problem caused by the fuel that releases the most carbon dioxide.
(d)[1 mark]Explain why environmental authorities may prefer natural gas over diesel.
Question 199
1 mark · Normal
Answer and check →Which statement best describes how crude oil forms?
- A.It forms rapidly when magma cools on the Earth's surface.
- B.It develops from the soft tissue of sea plants and animals buried under sediment over millions of years.
- C.It is created by freezing natural gas in the Arctic regions.
- D.It is made in laboratories by combining carbon and hydrogen gases.
Question 200
2 marks · Normal
Answer and see the solution →Give two differences between small and large hydrocarbon molecules found in crude oil.