DP Chemistry (first assessment 2025)

Test builder »

Question 23M.2.SL.TZ1.6b

Select a Test
Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.SL.TZ1.6b
Level SL Paper 2 Time zone TZ1
Command term Predict, Write Question number b Adapted from N/A
b.
[Maximum mark: 3]
23M.2.SL.TZ1.6b
(b)

Lipids and carbohydrates both release energy in the body.

(b.i)

Write balanced equations for the complete oxidation of fructose, C6H12O6, and the triglyceride tristearin, C57H110O6.


C6H12O6: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

C57H110O6: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

 

 

[2]

Markscheme

C6H12O6 + 6O2 → 6CO2 + 6H2O ✓

C57H110O6 + 81.5O2 → 57CO2 + 55H2O
OR
2C57H110O6 + 163O2 →114CO2 + 110H2O ✓

(b.ii)

Predict, giving one reason, whether 10.5 g of the triglyceride tristearin would release more or less energy than 10.5 g of fructose when completely oxidized.

[1]

Markscheme

more AND contains less oxygen/contains more carbon/more reduced ✓