C 2 H 4 Ethene g + H 2 g → Catalyst Heat , pressure C 2 H 6 Ethane Re-write the equation for the hydrogenation of ethene using structural formulae.

The given reaction represents the hydrogenation of ethene. It is an example of addition reaction. The equation can be written using their structural formula as,

E M B I B E

MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Data-based question: How does the composition of crude oil reserves vary?>Q 3

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IMPORTANT

Earn 100

Not all crude oil is the same. The composition varies according to the oil reserve from which it is extracted.

Refinery output for different crude oils. API stands for the American Petroleum Institute. API gravity is a measure of the density of the crude oil. A higher API gravity indicates less dense oil.

The terms sweet crude oil and sour crude oil refer to the sulphur content of the crude oil. Crude oil with less than $0.5 %$ sulphur content is classified as sweet. Which crude oils on this graph are considered sweet oil?

Important Questions on Evidence

HARD

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IMPORTANT

MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Data-based question: How does the composition of crude oil reserves vary?>Q 4

Sulphur is corrosive. Suggest reasons why sweet oil is easier to refine and is preferred by refineries? Why does sweet oil command a higher price per barrel?

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MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Exercise 17>Q 1

Determine the relationship between the number of carbons and the hydrogen in alkanes: if an alkane has

n

carbons, how many hydrogen atoms does it have? Write your answer in the form

C_{n} H_{}

.

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MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Exercise 17>Q 2

You have learnt about naming rules for chemical compounds. Where else do we use rules to govern communication in both writing and speech? Why are these rules essential for clear communication of meaning?

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MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Exercise 18>Q 1

$\underset{Ethene}{C_{2} H_{4}} (g) + H_{2} (g) \to_{Catalyst}^{Heat, pressure} \underset{Ethane}{C_{2} H_{6}}$

Re-write the equation for the hydrogenation of ethene using structural formulae.

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MYP Chemistry A concept-based approach Years 4&5>Chapter 2 - Evidence>Identifying alkenes>Q 1

If bromine water is mixed with an alkene (for example, ethene) the bromine water goes from an orange–brown colour to colourless. This reaction is used to indicate the presence of a carbon-carbon double bond.

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