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3 (a) Complete the sentence by putting a cross (X) in the box next to your answer - Edexcel - GCSE Chemistry - Question 3 - 2013 - Paper 1
Question 3
3 (a) 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 dist... show full transcript
Worked Solution & Example Answer:3 (a) 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.
Answer
The appropriate method to separate a mixture of two immiscible liquids is:
B a separating funnel.
A separating funnel is used specifically for this purpose because it allows the different liquid phases to layer based on their densities.
Step 2
The electronic configuration of oxygen is 2.6.
Answer
The dot and cross diagram for a molecule of oxygen (O₂) can be represented as follows:
- Each oxygen atom has six electrons in its outer shell.
- The two oxygen atoms share two pairs of electrons, forming a double bond.
Here's the representation:
O: :O
In this diagram, the dots represent the outer electrons from one oxygen atom, and the crosses represent the outer electrons from the other oxygen atom.