2 (a) A separating funnel is shown - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Question 2
2 (a) A separating funnel is shown.
The separating funnel can be used to separate two immiscible liquids, such as oil and water.
Describe how you would use a separa... show full transcript
Worked Solution & Example Answer:2 (a) A separating funnel is shown - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1
Step 1
Describe how you would use a separating funnel to separate two immiscible liquids.
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Answer
To use a separating funnel, first, allow the two immiscible liquids to form distinct layers. Then, carefully open the tap to let the lower liquid run out, while leaving the upper layer in the funnel. Repeat this process if needed to ensure complete separation.
Step 2
Use the results of the chromatography experiment to describe the colours present in the brown food colouring.
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Answer
The chromatography experiment shows that the brown food colouring contains two colours: green and red.
Step 3
Explain what happens when each solution is tested in the circuit shown.
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Answer
When the sodium chloride solution is tested, the bulb lights up because sodium chloride is an ionic compound and can conduct electricity due to the presence of ions. In contrast, when the sucrose solution is tested, the bulb does not light up since sucrose is a covalent compound and does not produce free ions in solution.
Step 4
Calculate the relative formula mass of water, H2O.
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Answer
To calculate the relative formula mass of water (H2O), we add the relative atomic masses of its components:
