IB Chemistry SL 1.3 Energy from Fuels Question Bank

Practise IB Chemistry SL 1.3 with questions that balance combustion equations, compare fuel impacts and explain how fuel cells convert chemical energy into electricity.

Covered syllabus points

1.3.1—Combustion reactions 1.3.2—Incomplete combustion 1.3.3—Fossil fuels 1.3.4—Biofuels 1.3.5—Fuel cells

[Maximum number: 1]

Ethyne, $\mathrm{C}_{2} \mathrm{H}_{2}$ , reacts with oxygen in welding torches.

Write an equation for the complete combustion of ethyne.

$\mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g})+2.5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

OR
$2 \mathrm{C}_{2} \mathrm{H}_{2}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 4 \mathrm{CO}_{2}(\mathrm{~g})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

[Maximum number: 1]

Which products may be formed during incomplete combustion of octane?

$\mathrm{CO}_{2}$ and $\mathrm{H}_{2}$

CO and $\mathrm{H}_{2}$

CO and $\mathrm{H}_{2} \mathrm{O}$

C, CO and $\mathrm{H}_{2}$

[Maximum number: 1]

The chart shows how sunlight changes as it passes through the earth's atmosphere. The light grey area shows the intensity at different wavelengths of sunlight entering the atmosphere. The dark grey area shows how much reaches sea level. Various molecules which interact with sunlight and the wavelengths they absorb are indicated on the following chart.

Spectrum of solar radiation (Earth)

Identify a major greenhouse gas not given in the diagram.

methane/ $\mathrm{CH}_{4}$

Marking guidance:

Accept " $\mathrm{N}_{2} \mathrm{O}$ ".

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Covered syllabus points

1.3 Energy from fuels question 1

1.3 Energy from fuels question 2

1.3 Energy from fuels question 3