A student used food tests on three drinks sold at a sports centre. Fig. 1 shows the test tubes after Benedict's solution had been added and heated. Table 1 ...
Question 1 Report
A student used food tests on three drinks sold at a sports centre. Fig. 1 shows the test tubes after Benedict's solution had been added and heated. Table 1 gives information from the labels on the drinks.
| Drink | Carbohydrate / g per 100 cm3 | Benedict's test result |
|---|---|---|
| Water | 0.0 | blue |
| Fruit drink | 8.6 | orange precipitate |
| Milk drink | 4.8 | green precipitate |
(a) Complete the conclusion for the fruit drink: it contains a large amount of __________ sugar. [2]
(b) Use Table 1 to describe the evidence that the Benedict's test results are linked to the amount of carbohydrate in the drinks. [2]
(c) Explain why the student used water as part of this test. [3]
Answer Details
(a) The fruit drink contains a large amount of reducing sugar. [2 marks]
(b) Water contains \(0.0\ \text{g}\) carbohydrate per \(100\ \text{cm}^3\) and remains blue. [1 mark] The fruit drink has the greatest carbohydrate content, \(8.6\ \text{g per }100\ \text{cm}^3\), and gives the strongest orange result. [1 mark] This supports a link between more carbohydrate and a stronger Benedict's result.
(c) Water contains no reducing sugar. [1 mark] It is therefore a control or comparison. [1 mark] If water stays blue, a colour change in a drink can be attributed to reducing sugar in that drink, rather than to Benedict's solution or heating. [1 mark]
Download The App On Google Playstore
Everything you need to excel in your exams
