WorksheetsCarbohydrates and Vitamines
Total questions: 10
Worksheet time: 7mins
Which statements must be true for a compound to be classed as a monosaccharide?
I. It must possess at least one hydroxyl group.
II. It must have the general formula (CH2O)n.
III. It must contain a carbonyl group.
I, II and III
II and III only
I and III only
I and II only
Which is both an aldose and a pentose?
Carbohydrates provide a quick and convenient source of energy. The reaction can be summarized as complete combustion in oxygen to give carbon dioxide and water.
Which is the general equation for the combustion of any monosaccharide or polysaccharide?
Cx(H2O)y + (x + y/2)O2 → xCO2 + yH2O
(CH2O)n + nO2 → nCO2 + nH2O
Cx(H2O)y + xO2 → xCO2 + yH2O
(CH2O)n + (n + n/2)O2 → nCO2 + nH2O
Which two molecules are formed when one molecule of sucrose is hydrolysed in acid solution?
What name is given to the bond formed when two monosaccharides condense together to form a disaccharide and water?
coordinate bond
peptide bond
hydrogen bond
glycosidic bond
Which functional groups are present in vitamin A
I. alkenyl
II. hydroxyl
III. phenyl
I and II only
I, II and III
II and III only
I and III only
Which vitamin helps to regulate the amount of calcium and phosphate in the human body?
vitamin A
vitamin B6
vitamin C
vitamin D
In the past sailors on long sea voyages used to suffer from 'scurvy'. What was the cause of this disease?
lack of fresh fruit and vegetables
eating too much fish
drinking contaminated water
exposure to too much sunlight
Which vitamins are fat-soluble?
I and II only
I and III only
II and III only
I, II and III
The molar mass of vitamin C is 176 g mol−1. The percentage of vitamin C in a vitamin tablet can be determined by titration with iodine solution.
C6H8O6(aq) + I2(aq) → C6H6O6(aq) + 2H+(aq) + 2I−(aq)
It requires 20.0 cm3 of 0.100 mol dm−3 iodine solution to react exactly with a solution made by dissolving a vitamin tablet with a mass of 1.00 g in 100.0 cm3 of water.
What is the percentage of vitamin C in the tablet? Assume nothing else in the tablet reacts with iodine.
17.6%
1.76%
35.2%
3.52%
