Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
481–490 of 785
Question 481
3 marks · Easy
Answer and see the solution →A student carries out fermentation at different temperatures. The table shows the volume of ethanol made after 3 days.
Ethanol production vs temperature Temperature (°C) Ethanol produced (cm³) 15 12 25 30 35 33 45 10 (a)[1 mark]At which temperature was the highest volume of ethanol produced?
(b)[1 mark]Suggest why the volume of ethanol is lower at 45°C.
(c)[1 mark]How does temperature affect the rate of fermentation based on this data?
Question 482
1 mark · Easy
Answer and see the solution →Name the chemical that is added to ethene for the direct industrial manufacture of ethanol.
Question 483
3 marks · Easy
Answer and see the solution →Ethanol can be made by adding steam to ethene.
(a)[1 mark]Write the word equation for this reaction.
(b)[1 mark]State one condition needed for this reaction to occur.
(c)[1 mark]Name the type of compound to which ethene belongs.
Question 484
2 marks · Easy
Answer and see the solution →Glucose can be converted to ethanol and carbon dioxide by fermentation.
Calculate the maximum volume of ethanol that can be produced by fermentation of 10 g of glucose at room temperature, if the yield is 100%. Use the following information:
Relative molecular mass (M_r) Molar volume of gas at room temperature Glucose (C_6H_{12}O_6) = 180 Ethanol (C_2H_5OH) = 46 1 mol = 24 dm³ (for gases) Give your answer in grams. (You may assume the density of ethanol is not needed for this calculation.)
Question 485
2 marks · Normal
Answer and see the solution →State two conditions required for the fermentation of glucose to produce ethanol.
Question 486
4 marks · Normal
Answer and see the solution →(a)[2 marks]Describe how ethanol can be made by fermentation of glucose.
(b)[1 mark]State the main product formed if the fermentation is carried out in the presence of air.
(c)[1 mark]Explain why the fermentation reaction is slow if the temperature is below 30°C.
Question 487
3 marks · Normal
Answer and see the solution →In a fermentation process, 180 g of glucose is completely converted to ethanol and carbon dioxide.
Calculate the mass of ethanol produced.
The equation for fermentation is:
M_r values: glucose (C6H12O6) = 180, ethanol (C2H5OH) = 46
Question 488
3 marks · Normal
Answer and see the solution →Ethanol can be produced by fermentation or by the hydration of ethene.
Explain two advantages and one disadvantage of making ethanol by fermentation instead of from ethene.
Question 489
4 marks · Normal
Answer and see the solution →(a)[2 marks]Data: Rate of ethanol production at different temperatures Temperature (°C) Ethanol produced after 2 days (cm³) 10 3 20 15 30 28 40 10 50 0 Describe the effect of temperature on the amount of ethanol produced after 2 days.
(b)[1 mark]Suggest a temperature range suitable for the fermentation process to produce the most ethanol.
(c)[1 mark]Explain why no ethanol is produced at 50°C.
Question 490
1 mark · Normal
Answer and check →Which statement about fermentation in ethanol production is correct?
- A.Yeast converts glucose to ethanol only at temperatures above 50°C.
- B.Fermentation must be carried out in the presence of air.
- C.Ethanol is produced by yeast enzymes acting on sugars.
- D.Water and carbon dioxide are the only products.