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Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 3 - 2013 - Paper 1

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Complete the sentence by putting a cross (X) in the box next to your answer. A mixture of two immiscible liquids can be separated by using ☐ A fractional distillati... show full transcript

Worked Solution & Example Answer:Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 3 - 2013 - Paper 1

Step 1

Complete the sentence by putting a cross (X) in the box next to your answer.

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Answer

The correct option is B a separating funnel. This method is specifically designed for separating two immiscible liquids due to the difference in their densities.

Step 2

(ii) Draw a dot and cross diagram for a molecule of oxygen, O₂.

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Answer

The dot and cross diagram for O₂ can be illustrated as follows:

  • Oxygen has an atomic number of 8, meaning each atom has 6 valence electrons (configuration is 2.6).
  • Each oxygen atom shares 2 electrons to form a double bond:
  O: :O
  • The dots (•) represent the outer electrons of one oxygen atom, and the crosses (×) represent the outer electrons of the other oxygen atom.
  • This diagram shows the shared pairs of electrons that create the double bond between the two oxygen atoms.

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