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The following table contains the percentage composition by mass of the nutritional value of some common foods - VCE - SSCE Chemistry - Question 15 - 2018 - Paper 1
Question 15
The following table contains the percentage composition by mass of the nutritional value of some common foods. | Food | % Carbohydrates | % Fats and oils | % Prot... show full transcript
Worked Solution & Example Answer:The following table contains the percentage composition by mass of the nutritional value of some common foods - VCE - SSCE Chemistry - Question 15 - 2018 - Paper 1
Step 1
100 g of fish
Answer
The energy content from fish can be calculated using the protein value. Fish has 0g carbs, 8g fats, and 29g protein. The energy from protein is calculated as follows:
- Energy from protein per gram = 4 kcal (approximate).
- Protein in 100 g fish = 29 g.
- Total energy = 29 g x 4 kcal/g = 116 kcal.
Step 2
100 g of bread
Answer
For bread:
- Carbohydrates = 50 g, which provides 4 kcal/g.
- Fats = 4 g, which provides 9 kcal/g.
- Protein = 8 g, which provides 4 kcal/g.
Calculating total energy:
- Energy from carbohydrates = 50 g x 4 kcal/g = 200 kcal.
- Energy from fats = 4 g x 9 kcal/g = 36 kcal.
- Energy from protein = 8 g x 4 kcal/g = 32 kcal.
- Total energy = 200 + 36 + 32 = 268 kcal.
Step 3
40 g of cheese
Answer
For cheese:
- Carbohydrates = 1 g, % energy negligible.
- Fats = 34 g, providing 9 kcal/g.
- Protein = 25 g, providing 4 kcal/g.
Calculating total energy:
- Energy from fats = 34 g x 9 kcal/g = 306 kcal.
- Energy from protein = 25 g x 4 kcal/g = 100 kcal.
- Total energy from 40 g cheese (considering 1 g of carbs negligible) = (306 + 100)/100 * 40 = 164.4 kcal (approx).
Step 4
258 g (250 mL) of milk
Answer
For milk: Milk has 5 g carbohydrates, 4 g fats, and 3 g protein per 100 g.
Calculating total energy for 258 g:
- Carbohydrates = 5 g, providing 4 kcal/g.
- Fats = 4 g, providing 9 kcal/g.
- Protein = 3 g, providing 4 kcal/g.
- Total:
- Energy from carbohydrates = 5 g x 4 kcal/g = 20 kcal.
- Energy from fats = 4 g x 9 kcal/g = 36 kcal.
- Energy from protein = 3 g x 4 kcal/g = 12 kcal.
- For 258 g: Total energy from 100 g = 20 + 36 + 12 = 68 kcal. Total energy from 258 g = (258/100) * 68 = 175.44 kcal.