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 term used 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
To separate water and oil using a separating funnel, follow these steps:
Open the tap of the funnel to allow the water, being the denser layer, to run off first.
Pour off the remainder of the mixture by carefully allowing the oil, which is less dense, to stay in the funnel until the water has all flowed out.
Stop before the oil comes out to ensure that you are only collecting the water.
Step 3
State what will happen to the wax when it is heated using a Bunsen burner.
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Answer
The wax will melt when heated using a Bunsen burner.
Step 4
Explain why.
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Answer
The sand does not visibly change when heated because:
Sand has a high melting point of 1610 °C, which is well above the temperature typically reached by a Bunsen burner.
The Bunsen burner does not produce enough heat to break the strong covalent bonds in the sand.
Therefore, it remains solid without any observable melting.
Step 5
What type of structure does wax have?
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Answer
Wax has a simple molecular, covalent structure.
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 are pure because they each produce a single, distinct spot on the chromatography paper, indicating that they contain only one type of substance.
Step 7
Explain what you can deduce about the ink Z used on the note.
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Answer
Ink Z can be deduced to be a mixture of dyes because it produces multiple spots on the chromatography paper, showing that it contains more than one type of dye.
