Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
231–240 of 785
Question 231
2 marks · Easy
Answer and see the solution →A hydrocarbon burns in exactly 20 g of oxygen during complete combustion. Calculate the mass of carbon dioxide produced if all the oxygen is converted into carbon dioxide. (Assume all atoms from oxygen go into making carbon dioxide; ignore water formation for this calculation. Relative atomic masses: C = 12, O = 16)
Question 232
2 marks · Normal
Answer and see the solution →State the name of the process used to separate crude oil into useful fractions and give one reason why crude oil must be separated in this way.
Question 233
4 marks · Normal
Answer and see the solution →This question is about combustion of hydrocarbons.
(a)[1 mark]Write the word equation for the complete combustion of propane.
(b)[1 mark]State the two main products formed during complete combustion of a hydrocarbon.
(c)[2 marks]Explain, using your knowledge of incomplete combustion, why burning a hydrocarbon in a limited supply of air may produce a dangerous gas.
Question 234
3 marks · Normal
Answer and see the solution →Explain why burning hydrocarbons in a poorly ventilated room can lead to serious health risks. In your answer, refer to the products formed during incomplete combustion.
Question 235
4 marks · Normal
Answer and see the solution →The table below shows information about some fractions obtained from crude oil.
Fractions from crude oil Fraction Approximate Boiling Point (°C) Main Use Refinery gas < 40 Bottled gas Gasoline 40–100 Fuel for cars Diesel oil 250–350 Fuel for lorries Bitumen > 350 Road surfacing (a)[1 mark]Identify the fraction with the lowest boiling point and state its main use.
(b)[2 marks]Which fraction is most likely to contain the largest hydrocarbon molecules? Explain your answer using data from the table.
(c)[1 mark]Suggest why bitumen is not used as a fuel.
Question 236
1 mark · Normal
Answer and check →Which gas is a poisonous product of incomplete combustion of hydrocarbons?
- A.Carbon dioxide
- B.Nitrogen
- C.Carbon monoxide
- D.Oxygen
Question 237
2 marks · Normal
Answer and see the solution →Name two main fractions produced by the fractional distillation of crude oil and give one use for each.
Question 238
4 marks · Normal
Answer and see the solution →This question is about combustion of hydrocarbons and pollution.
(a)[1 mark]Name the two conditions necessary for the complete combustion of a hydrocarbon.
(b)[1 mark]Write the balanced word equation for the incomplete combustion of methane, producing carbon monoxide as one of the products.
(c)[2 marks]Explain why carbon monoxide is produced during incomplete combustion and state one environmental or health effect it can cause.
Question 239
3 marks · Normal
Answer and see the solution →A certain crude oil contains 1000 kg of hydrocarbons. When it is separated by fractional distillation at a refinery, the following fractions are collected:
Fraction Percentage by mass Refinery gas 4% Gasoline 20% Kerosene 15% Diesel oil 18% Fuel oil 23% Bitumen 20% Calculate the mass of the kerosene fraction obtained from this crude oil. Give your answer in kilograms.
(a)[3 marks]Show your working and give your final answer with the correct unit.
Question 240
2 marks · Hard
Answer and see the solution →State the trend in boiling point and position within the fractionating column for hydrocarbons with increasing chain length, giving a reason for each.