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 liquids to settle into two distinct layers. Then, open the tap to let the lower layer drain out while the top layer remains in the funnel. Once the first layer is completely removed, close the tap and pour out the remaining upper layer.
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 brown food colouring contains green and red colours, indicating a combination of these two colours in its composition.
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 circuit will complete and the bulb will light up because it contains ions that can conduct electricity. In contrast, the sucrose solution will not light the bulb, as it is a covalent compound and does not produce 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 need to sum the relative atomic masses of hydrogen and oxygen:
