Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Question 4
Complete the sentence by putting a cross (✗) in the box next to your answer.
Alkenes are
A saturated carbohydrates
B saturated hydrocarbons
C unsaturated carboh... show full transcript
Worked Solution & Example Answer:Complete the sentence by putting a cross (✗) in the box next to your answer - Edexcel - GCSE Chemistry - Question 4 - 2016 - Paper 1
Step 1
Complete the sentence by putting a cross (✗) in the box next to your answer.
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Answer
Alkenes are D: unsaturated hydrocarbons.
Step 2
Draw the structure of a propene molecule, showing all of the bonds.
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Answer
The structure of a propene molecule can be represented as:
H H
| |
H--C=C--H
| |
H H
This shows the double bond between the two carbon atoms and all hydrogen atoms bonded appropriately.
Step 3
Given a sample of each gas, describe a test, carried out on both gases, to show which gas is propane and which gas is propene.
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Answer
Add Bromine Water:
Propene: When bromine water is added to propene, it turns colorless due to the bromination reaction, indicating the presence of a double bond.
Propane: Propane does not react with bromine water, remaining brown/orange in color.
