IB Biology HL C4.2.19 Co Release During Combustion Questions

Calculate percentage fuel-use changes, compare fossil-fuel trends and explain how combustion releases carbon dioxide in IB Biology HL C4.2.19.

Exam points

Calculate percentage changes in the use of named fossil fuels from supplied data.
Compare fuel-use trends and explain that combustion of biomass or fossil fuels releases CO₂ to the atmosphere.

[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 IB Biology HL C4.2.19 Co Release During Combustion Questions 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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IB Biology HL C4.2.19 Co Release During Combustion Questions question 1

Question (a)

Question (b)