Water and oil do not mix - Edexcel - GCSE Chemistry - Question 3 - 2012 - Paper 1
Question 3
Water and oil do not mix.
(i) What term is used to describe two liquids that do not mix?
Put a cross (✗) in the box next to your answer.
A ionic
B inflammable
C... show full transcript
Worked Solution & Example Answer:Water and oil do not mix - Edexcel - GCSE Chemistry - Question 3 - 2012 - Paper 1
Step 1
What term is used to describe two liquids that do not mix?
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Answer
The correct term to describe two liquids that do not mix is immiscible.
Step 2
Describe how the separating funnel is used to separate samples of water and oil from the mixture.
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Answer
The separating funnel is used in the following way:
Open the tap to allow the lower layer (water) to flow out into a container, ensuring that the oil remains in the funnel.
Once the water has been separated, the tap can be closed before any of the oil escapes.
Pour out the remainder of the mixture (oil) through the top of the funnel, effectively separating both liquids.
Step 3
State what will happen to the wax when it is heated using a Bunsen burner.
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Answer
When the wax is heated using a Bunsen burner, it melts, turning it into a liquid.
Step 4
Explain why there is no visible change when the sand is heated using a Bunsen burner.
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Answer
The sand does not undergo a visible change when heated because it has a high melting point of 1610 °C. The temperature of the Bunsen burner is not sufficient to reach this melting point, thus the sand remains solid and unchanged.
Step 5
What type of structure does wax have?
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Answer
Wax has a simple molecular, covalent structure due to the weak intermolecular forces between the molecules, resulting in a low melting point.
Step 6
State how you can tell that dyes W, X and Y are pure.
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Answer
Dyes W, X, and Y appear as single spots on the chromatography paper, indicating they are pure substances without any impurities.
Step 7
Explain what you can deduce about the ink Z used on the note.
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Answer
The ink Z appears as multiple spots on the chromatography paper, which indicates that it is a mixture of different dyes rather than a pure substance.
