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The diagram shows a ball and stick model for ethene, C2H4 - OCR Gateway - GCSE Chemistry - Question 16 - 2022 - Paper 3
Question 16
The diagram shows a ball and stick model for ethene, C2H4. (a) Which statements about this ball and stick model of ethene are correct? Tick (✓) two boxes. The mode... show full transcript
Worked Solution & Example Answer:The diagram shows a ball and stick model for ethene, C2H4 - OCR Gateway - GCSE Chemistry - Question 16 - 2022 - Paper 3
Step 1
Which statements about this ball and stick model of ethene are correct?
Answer
The correct statements are:
- The model shows how many electrons the carbon atoms have.
- The model shows the difference between double bonds and single bonds.
These options accurately reflect the structural features of the ethene molecule.
Step 2
Complete the dot and cross diagram for bromine, Br2. Show the electrons in the outer shells only.
Answer
In the dot and cross diagram for Br2, each bromine atom has 7 valence electrons. Represent these by using dots for one bromine atom and crosses for the other. The shared pair of electrons that forms the bond between the bromine atoms should be indicated, while the rest of the structure should ensure that each bromine shows its outer electrons as follows:
• •
Br •• •• Br
• •
In this representation, the pairs of dots (•) represent the outer shell electrons of each bromine atom.