2. Paper chromatography can be used to separate the coloured dyes in inks - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1
Question 2
2. Paper chromatography can be used to separate the coloured dyes in inks.
A student carried out a chromatography experiment on four inks, W, X, Y and Z.
The diagr... show full transcript
Worked Solution & Example Answer:2. Paper chromatography can be used to separate the coloured dyes in inks - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1
Step 1
State the letter of the ink that contained only one coloured dye.
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Answer
The letter of the ink that contained only one coloured dye is Y.
Step 2
Ink W has been made by mixing two of the other inks together. State the two inks that could have been mixed to make ink W.
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Answer
The two inks that could have been mixed to create ink W are X and Z.
Step 3
Complete the sentence by putting a cross (✗) in the box next to your answer. Oil and water are immiscible liquids. A mixture of oil and water is best separated by using:
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Answer
D a separating funnel.
Step 4
Which row of the table correctly shows the boiling point and ability to conduct electricity of a simple molecular, covalent liquid? Put a cross (✗) in the box next to your answer.
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Answer
The correct answer is A (low boiling point and good ability to conduct electricity).
Step 5
Write the balanced equation for this reaction.
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Answer
The balanced equation for the reaction is:
ightarrow ext{2HCl}$$
Step 6
Draw a dot and cross diagram to show the arrangement of electrons in a molecule of hydrogen chloride, HCl. Show outer electrons only.
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Answer
In the dot and cross diagram of HCl, hydrogen has one outer electron, and chlorine has seven outer electrons. The diagram should show one dot representing hydrogen's electron and seven crosses representing chlorine's electrons, indicating the sharing of one pair of electrons to form a covalent bond.
