Practice R1.3 Energy from fuels with authentic IB Chemistry exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like atomic structure, chemical reactions, and organic chemistry. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
A candle is burned in a closed jar with limited oxygen. Over time, black soot forms on the glass, and the flame goes out.
Define incomplete combustion.
Write a balanced chemical equation for the incomplete combustion of methane forming carbon monoxide.
State another possible product of incomplete combustion besides carbon monoxide.
Suggest why incomplete combustion is dangerous in enclosed spaces.
Compare the energy released in complete and incomplete combustion of the same fuel.
Methanol is an alternative fuel used in direct methanol fuel cells (DMFCs). Unlike hydrogen, it is a liquid at room temperature and can be stored more easily.
Write the balanced overall equation for the methanol fuel cell.
Deduce the half-equation for the oxidation of methanol at the anode.
State the product formed at the cathode of a methanol fuel cell.
Suggest one disadvantage of methanol compared to hydrogen in fuel cell applications.
Coal and natural gas are widely used fossil fuels for electricity generation and heating. Their combustion releases energy, but their environmental impacts differ significantly.
Write a balanced chemical equation for the complete combustion of propane (), a component of natural gas.
The energy released per gram of fuel is: Coal = Methane = Compare the energy output of these fuels and suggest an advantage of methane based on this data.
Describe two environmental advantages of using natural gas instead of coal.
Suggest one disadvantage of relying heavily on natural gas as an energy source.
Write the balanced equation for the incomplete combustion of propane forming carbon monoxide.
Which expression gives the mass, in g , of ethanol required to produce 683.5 kJ of heat upon complete combustion?
Which of the following statements about the combustion of fuels is correct?
Which of these energy sources is considered renewable?
Which is a renewable energy source?
Which of the following is a non-renewable energy source?
Which of the following statements best explains why hydrogen fuel cells are more efficient than internal combustion engines?
What is the primary chemical process involved when a fuel is used to release energy?