The newest 11 of 11 written questions. Open one to see it on the real paper.
Explain why methane is described as a saturated hydrocarbon.
See it on the paper →Complete the dot-and-cross diagram in Fig. 6.1 to show the electron arrangement of methane. Show outer electrons only. H H C H H
See it on the paper →Complete the sentence about alkane molecules. The bonding between carbon atoms in alkanes is covalent and
See it on the paper →The molecular formula for propane is C 3 H 8 . Butane has four carbon atoms. Write the molecular formula for butane.
See it on the paper →Compound B, C 3 H 8 , burns in oxygen, O 2 . Carbon dioxide and water are made. Construct the balanced symbol equation for this reaction.
See it on the paper →Butane, C 4 H 10 , is an alkane. Complete the sentence about alkanes. Alkanes are hydrocarbons whose molecules contain only covalent bonds.
See it on the paper →State the relationship between the number of carbon atoms in the alkane and the energy given out.
See it on the paper →Butane is a small alkane molecule. Large alkane molecules are cracked into smaller, more useful molecules. The equation shows the cracking of C 24 H 50 to make C 10 H 22 and one other product. Complete the equation.
See it on the paper →State what is meant by a hydrocarbon.
See it on the paper →Tetradecane is an alkane with 14 carbon atoms. Write the molecular formula for tetradecane. molecular formula =
See it on the paper →Decene is not an alkane. It has the molecular formula C 10 H 20 . Use the general formula C n H 2n+2 to show that decene is not an alkane.
See it on the paper →Very occasionally the term unsaturated rather than saturated was given. More commonly seen was single bonds as one bond.
— Examiner report, February/March 2024, 0654/42 Q11(a) (Cambridge)
A minority of candidates misidentified that a higher number of carbons resulted in a larger amount of energy released.
— Examiner report, February/March 2024, 0654/42 Q11(b)(i) (Cambridge)
The majority of candidates were able to deduce the correct product.
— Examiner report, February/March 2024, 0654/42 Q11(c) (Cambridge)
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