The newest 6 of 6 written questions. Open one to see it on the real paper.
Construct the balanced ionic equation for the reaction. Include state symbols.
See it on the paper →Balance the symbol equation for the complete combustion of methane. CH + O CO + H O
See it on the paper →Butane, C 4 H 10 , burns completely in air. Carbon dioxide and water are made. Construct the balanced symbol equation for this reaction.
See it on the paper →Construct the balanced symbol equation for the addition of steam to ethene to make ethanol, C 2 H 5 OH. +
See it on the paper →Write the balanced symbol equation for this reaction.
See it on the paper →Balance the equation for the combustion of hydrogen. H + O H O
See it on the paper →Almost all candidates balanced the symbol equation correctly.
— Examiner report, February/March 2024, 0654/32 Q8(b)(i) (Cambridge)
Some candidates could write the symbol equation for the combustion of butane. Some equations did not always show understanding of the involvement of oxygen in combustion. Balancing the equation also was found to be challenging but there were a considerable number of correct answers.
— Examiner report, October/November 2022, 0654/41 Q2(c) (Cambridge)
The mark for correctly identifying the formula of ethene was commonly awarded, however fewer candidates were able to complete the chemical equation to gain full marks.
— Examiner report, October/November 2022, 0654/43 Q2(c)(i) (Cambridge)
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