GCSE AQA Chemistry Measurement, Mass & Equations: A student investigated the colou

Question

A student investigated the colours in three different flowers, A, B and C.

The colours are soluble in ethanol but are insoluble in water.

This is the method used.

1. Crush flower A.
2. Add ethanol to flower A.
3. Filter the mixture.
4. Put spots of the coloured filtrate on the chromatography paper.
5. Repeat steps 1-4 with flowers B and C.

Figure 4 shows the apparatus used.

1. The student made two mistakes in setting up the apparatus.
   Give one problem caused by each mistake.
   Mistake 1 ____________________________
   Problem caused _________________________
   Mistake 2 ____________________________
   Problem caused _________________________

2. Another student set up the apparatus correctly.
   Figure 5 represents the student’s results.

Give two conclusions you can make from Figure 5.
   1. ___________________________________
   2. ___________________________________

3. Colour A has an Rf value of 0.65.
   Colour A moves 3.2 cm.
   Calculate the distance moved by the solvent.
   Distance moved by solvent = __________ cm

A student investigated the colours in three different flowers, A, B and C - AQA - GCSE Chemistry - Question 4 - 2018 - Paper 2

Worked Solution & Example Answer:A student investigated the colours in three different flowers, A, B and C - AQA - GCSE Chemistry - Question 4 - 2018 - Paper 2

Mistake 1

Mistake 2

Give two conclusions you can make from Figure 5.

Calculate the distance moved by the solvent.

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