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Hydrogen fuel environmental drawbacks
In the future, gas central heating boilers may burn hydrogen rather than natural gas. Table 2 shows information about these fuels when 1 dm³ of the fuel is burned in a central heating boiler.
| Hydrogen | Natural gas | |
|---|---|---|
| Energy released in kJ | 11.9 | 37.1 |
| Mass of carbon dioxide produced in grams | 0.00 | 1.83 |
| Mass of water vapour produced in grams | 0.75 | 1.50 |
| Mass of oxides of nitrogen produced in grams | 6.6 × 10⁻⁴ | 4.9 × 10⁻⁴ |
Explain one negative impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2.
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Marking points
- 1 Uses Table 2 to identify that hydrogen produces more oxides of nitrogen.
- 2 Links the additional oxides of nitrogen to more acid rain or respiratory problems.
Full-mark answer
Hydrogen produces more oxides of nitrogen than natural gas. These pollutants can cause more acid rain or respiratory problems.
Why this answer loses marks
Hydrogen is worse because it releases more pollution.
This neither names oxides of nitrogen nor links them to acid rain or respiratory harm.