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2 (a) A separating funnel is shown - Edexcel - GCSE Chemistry - Question 2 - 2013 - Paper 1

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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 for separating two immiscible liquids, follow these steps:

  1. Allow the liquids to settle into two distinct layers based on their densities.
  2. Open the tap of the separating funnel to let the lower layer (the denser liquid) flow out into a suitable container.
  3. Close the tap once the lower layer has been drained, leaving the upper layer in the funnel.

Step 2

Use the results of the chromatography experiment to describe the colours present in the brown food colouring.

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Answer

From the chromatography results, the brown food colouring contains both green and red colours, demonstrating a combination of these two distinct hues.

Step 3

Explain what happens when each solution is tested in the circuit shown.

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Answer

When sodium chloride solution is tested, it conducts electricity, allowing the light bulb to light up because it contains ions that facilitate electrical flow. In contrast, when sucrose solution is tested, the bulb does not light up because sucrose does not dissociate into ions in solution, thus failing to conduct electricity.

Step 4

Calculate the relative formula mass of water, H₂O.

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Answer

To calculate the relative formula mass of water (H₂O):

  • The relative atomic mass of Hydrogen (H) = 1.0
  • The relative atomic mass of Oxygen (O) = 16

The formula mass of water is calculated as follows:

extRelativeformulamassofH2O=2(H)+1(O)=2(1.0)+16=18 ext{Relative formula mass of H₂O} = 2(H) + 1(O) = 2(1.0) + 16 = 18

Thus, the relative formula mass of water is 18.

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