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 i... 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 at the bottom of the funnel to allow the lower layer (water) to run off into a container.
Stop the flow before the oil layer starts to exit the funnel.
Pour the remaining mixture of oil through the top of the funnel into another container.
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 melt when heated because:
It has a giant molecular (covalent) structure, which involves strong covalent bonds that require a significant amount of energy to break.
The high melting point of sand (1610 °C) means that the temperature of the Bunsen burner is not sufficient to reach this melting point.
Therefore, there is no visible change when the sand is heated.
Step 5
What type of structure does wax have?
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Answer
Wax has a simple molecular (covalent) structure, characterized by weak intermolecular forces.
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 distinct single spots on the chromatography paper, indicating that they are pure substances.
Step 7
Explain what you can deduce about the ink Z used on the note.
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Answer
Ink Z shows multiple spots on the chromatography paper, indicating that it is a mixture of different dyes rather than a pure substance.
