A student did an experiment to prove that methane gas, CH4, produces carbon dioxide and water when it burns.
Look at the diagram of her experiment.
The limewater turned milky showing that carbon dioxide had been formed.
A small amount of a colourless liquid condensed in boiling tube X. The student said that this proved that burning methane produced water.
The teacher said that the experiment had been set up incorrectly.
The teacher said that the student’s conclusion about water was not valid.
Describe and explain how the student could change how the experiment is set up to prove that water is produced by burning methane.
Higher Only
Look at the monomers shown in the table.
Two of the monomers from the table react to form a polymer which is a polyester.
Explain, using the appropriate monomers from the table, how the polyester is formed.
Include the type of polymerisation and an equation for the reaction in your answer.
DNA and proteins are biological polymers.
An alcohol, X, has the formula C3H7OH.
Alcohol X can be oxidised to a compound, Y, with the molecular formula C3H6O2.
Write down the name of this homologous series.
[1]
Show all the covalent bonds.
Alcohol X
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