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 diagram... 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 X.
Step 2
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 make ink W are Y and Z.
Step 3
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
The correct answer is 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?
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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 2HCl $$
Step 6
Draw a dot and cross diagram to show the arrangement of electrons in a molecule of hydrogen chloride, HCl.
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Answer
For hydrogen chloride (HCl), the arrangement is as follows:
Hydrogen (H) has 1 electron, represented by a dot.
Chlorine (Cl) has 7 outer electrons, represented by crosses.
The diagram consists of one dot (H) shared with one of the crosses (Cl) to show the covalent bond.
