State which listed nutrient does not supply energy.

Deduce, with a reason, which listed nutrient provides the most energy per 25 g serving.

Outline the differences in molecular structure between the types of fat found in  the peanuts.

fibre

monounsaturated fat;
fats contain more energy than carbohydrates or proteins;
fats contain 4000 kJ per 100 g/9 kcal per 100 g;
more monounsaturated fat present than other fats;

saturated and unsaturated fats differ in number of single and double carboncarbon bonds/ratio of hydrogen to carbon atoms in fatty acid chains;
saturated fat – carbon atoms all joined by single bonds / have no double bonds / have no increase in number of hydrogen atoms possible;
monounsaturated fat – one double bond in carbon chain / could add two hydrogens in the carbon chain;
polyunsaturated fat – two/more double bonds in the carbon chain;
saturated fatty acid chains tend to be straight while mono/polyunsaturated have kinks/bends;

Many candidates were able to gain the mark for indicating that fibre does not provide energy.

Many were able not able to read the nutrient label correctly and see that monounsaturated fats provided the most energy. They incorrectly indicated that proteins did as there were more grams of protein. They did not consider that fats contain more energy than proteins.

There were often vague descriptions of the differences between saturated and unsaturated fats. Many indicated that there were double bonds but did not indicate that these were between carbon atoms. Some were confusing double and single bonds with hydrogen bonds.