IB Chemistry HL R1.3 Energy from fuels questions

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Type
Multiple choiceWritten
Difficulty
EasyMediumHard

Question 1

Paper 2Easy8 marks

A student compares the air supply to two identical burners, each supplied with methane, CH₄, at the same rate. Figure 1 is a schematic diagram; the side arrows indicate the relative air supply to each burner.

ABCH4CH4
(a)

Using Figure 1, identify which burner is more likely to undergo incomplete combustion. Give one reason based on the figure.

[2]
(b)

For burner B, write a balanced equation for incomplete combustion of methane in which carbon monoxide and water are the products. State symbols are not required.

[2]
(c)

Ethanol, C₂H₅OH, burns with a restricted oxygen supply to form solid carbon and water. Write a balanced equation for this reaction. State symbols are not required.

[2]
(d)

State one health risk of carbon monoxide and suggest one change that would reduce the likelihood of carbon monoxide forming or accumulating.

[2]

Question 2

Paper 2Medium7 marks

A pilot plant produces bioethanol from glucose in crop biomass. Figure 1 shows a simplified carbon pathway for one batch. The fermentation equation is:

\ceC6H12O6−>2C2H5OH+2CO2\ce{C6H12O6 -> 2C2H5OH + 2CO2}

Use relative atomic masses from the data booklet where needed.

Atmospheric CO2Crop biomass:glucoseFermentationBioethanolphotosynthesis;carbon fixed duringone growing season90.0 kg glucose38.6 kg ethanol collectedCO2 releasedcombustion releasesCO2
(a)

Write a balanced equation for photosynthesis in plants.

[1]
(b)

Use the fermentation equation and Figure 1 to calculate the theoretical mass of ethanol and the percentage yield for this batch. Give the mass in kg and the percentage yield to three significant figures.

[3]
(c)

Using Figure 1, explain why the ethanol can be considered a renewable fuel.

[2]
(d)

State one reason why Figure 1 alone does not establish that using this bioethanol is carbon neutral.

[1]

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