IB Biology HL 4.2.19 CO₂ release during combustion Question Bank

Practise IB Biology HL 4.2.19 by calculating percentage change and comparing historical fuel-use trends.

Exam points

Calculate percentage change in fuel use and relate combustion to carbon-dioxide release.
Compare fuel-use trends and evaluate their implications for carbon emissions.

[Maximum number: 3]

The graph shows global $\mathrm{CO}_{2}$ contributions from the use of fuels since 1825. Emissions estimates for the years since 1950 are based on energy data from the United Nations while emissions estimates for years prior to 1950 have been constructed using a variety of sources.

Figure for Question C4.2.19—CO₂ release during combustion question 1 — IB Biology HL

(a)

Calculate the percentage increase in the use of liquid fuels from 1950 to 1975.

[ 1 ]

$\text { « } \frac{(2250-300) \times 100}{300}=\text { » } 650 \text { «\%» }$

(b)

Referring to the data, compare and contrast the changes in the use of the different fuels between 1950 and 1975.

[ 2 ]

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C4.2.19—CO₂ release during combustion question 1

Question (a)

Question (b)