7 Organic Trilogy and seperate 2 Flashcards Preview

10BT Chemistry Paper 2 > 7 Organic Trilogy and seperate 2 > Flashcards

Flashcards in 7 Organic Trilogy and seperate 2 Deck (18)
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1

What is cracking?

The process of breaking down a long hydrocarbon into smaller hydrocarbons

2

What are the products of cracking?

Short alkanes and alkenes

3

Why is cracking important?

Because smaller hydrocarbons are more useful than longer ones

4

What are the two types of cracking?

Catalytic and steam cracking

5

What are alkenes

A different type of hydrocarbon which is more reactive than an alkane

6

What are alkenes used for?

As a starting material to make more useful chemicals

7

How do you test for an alkene?

React it with bromine water

8

What is the colour change when an alkene reacts with bromine water?

Turns from orange to colourless

9

What is an alkene?

A hydrocarbon with a double bond

10

What is the general formula for alkenes?

CnH2n

11

What does unsaturated means?

Contains double bonds (which could become C-H bonds)

12

What are the first four alkenes?

Ethene, propene, butene, pentene

13

What are the four reactions of alkenes?

Combustion, with water, with hydrogen and with halogens

14

How is the combustion of alkenes different to combustion of alkanes?

Alkenes usually react by incomplete combustion so burn with smoky flames

15

Why are the reactions of alkenes with hydrogen, water and halogens known as "addition" reactions?

Because new atoms are being added to the molecule by breaking the double bond

16

What is the product from the reaction of an alkene with hydrogen?

An alkane

17

What conditions are necessary in the reaction of alkenes with hydrogen?

60oC, Nickel catalyst

18

How many bonds do carbon atoms make?

4