The structure of a molecule of propene is H H \ / C=C / \ H CH3 (a) Propene is an unsaturated hydrocarbon. (i) Explain what is meant by unsaturated hydrocarbon. (ii) Complete the sentence by putting a cross (✗) in the box next to your answer. Propene can be made by using heat to decompose large alkane molecules into smaller, more useful molecules. This process is known as A combustion B cracking C fractional distillation D polymerisation (iii) Describe what is seen when a sample of propene is shaken with bromine water.

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The structure of a molecule of propene is H H \ / C=C / \ H CH3 (a) Propene is an unsaturated hydrocarbon - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1

Question 2

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The structure of a molecule of propene is H H \ / C=C / \ H CH3 (a) Propene is an unsaturated hydrocarbon. (i) Explain what is meant by... show full transcript

Worked Solution & Example Answer:The structure of a molecule of propene is H H \ / C=C / \ H CH3 (a) Propene is an unsaturated hydrocarbon - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1

Step 1

Explain what is meant by unsaturated hydrocarbon.

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Answer

An unsaturated hydrocarbon is a type of hydrocarbon that contains at least one double bond or multiple bond between carbon atoms. This implies that these compounds do not contain the maximum number of hydrogen atoms that can bond with the carbon atoms, since some bonding sites on the carbon are occupied by double bonds.

Step 2

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

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Answer

The answer is B: cracking. This process involves using heat to break down larger alkane molecules into smaller, useful molecules.

Step 3

Describe what is seen when a sample of propene is shaken with bromine water.

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Answer

When a sample of propene is shaken with bromine water, the color of the bromine water, which is reddish-brown, will disappear. This decolorization occurs due to the reaction of bromine with the double bond in propene, indicating that an addition reaction takes place.

The structure of a molecule of propene is H H \ / C=C / \ H CH3 (a) Propene is an unsaturated hydrocarbon - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1

Worked Solution & Example Answer:The structure of a molecule of propene is H H \ / C=C / \ H CH3 (a) Propene is an unsaturated hydrocarbon - Edexcel - GCSE Chemistry - Question 2 - 2015 - Paper 1

Explain what is meant by unsaturated hydrocarbon.

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

Describe what is seen when a sample of propene is shaken with bromine water.

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