Write in soft pencil.
Do not use staples, paper clips, glue or correction fluid.
Write your name, Centre number and candidate number on the Answer Sheet in the spaces provided unless
this has been done for you.
DO NOT WRITE IN ANY BARCODES.
There are forty questions on this paper. Answer all questions. For each question there are four possible
answers A, B, C and D.
Choose the one you consider correct and record your choice in soft pencil on the separate Answer Sheet.
Read the instructions on the Answer Sheet very carefully.
Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Any rough working should be done in this booklet.
Electronic calculators may be used.
This document consists of 15 printed pages and 1 blank page.
A 1, 2, 3 and 4 B 1, 2 and 3 only C 1 and 3 only D 2 and 4 only
6 In order to estimate the quantity of glucose in a solution, equal volumes of a range of known
concentrations were mixed with equal excess volumes of Benedict’s solution and placed in a
thermostatically controlled water-bath at 90 °C for the same length of time.
The unknown solution was then treated in the same way and the colours of the known and
unknown solutions compared.
What is the independent variable in this procedure?
A concentration of glucose
B final colour of solutions
C temperature of water-bath
D volumes of glucose solutions
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