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C7 Organic Chemistry

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Last updated 25 days ago
59 questions
4.7.1.1 Crude oil, hydrocarbons and alkanes
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4.7.1.2 Fractional distillation and petrochemicals
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4.7.1.3 Properties of hydrocarbons
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4.7.1.4 Cracking and alkenes
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4.7.2.1 Structure and formulae of alkenes
4.7.2.2 Reactions of alkenes
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4.7.2.3 Alcohols
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4.7.2.4 Carboxylic acids
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4.7.3 Synthetic and naturally occurring polymers
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Question 1
1.

The prefix for 3 carbons is but-

Question 2
2.

The general formula for alkanes is:

Question 3
3.
Have a general formula of ____________
each molecule differs from the last by ________
Trends down the series:
1. Melting points and boiling points _____________
2. Volatility ______________
3. Flammability ______________
4. Viscosity ______________
5. Intermolecular forces _____________
Other Answer Choices:
decreases
CnH2n+2
increases
CH2
increase
Question 4
4.

Name the alkane

Question 5
5.

Crude oil is a mixture of hydrocarbons. Most of these hydrocarbons are alkanes.

The general formula of an alkane is CnH2n+2

Complete the structural formula for the alkane that has six carbon atoms in its molecules.

(This question will not return an answer until it is looked at by Miss Bryant)

Question 6
6.

Crude oil contains a large number of hydrocarbons.

Crude oil is a finite resource.

What is a finite resource?

Tick (✓) one box.

Question 7
7.

What is crude oil formed from?

Tick (✓) one box.

Question 8
8.

This diagram shows a reaction which takes place in an oil refinery.



X, Y and Z are all examples of which type of compound?

Question 9
9.

Suggest one use for compound Z.

Question 10
10.

Match the alkane name to its molecular formula

Draggable itemarrow_right_altCorresponding Item
Methane
arrow_right_alt
CH4
Propane
arrow_right_alt
C2H6
Pentane
arrow_right_alt
C3H8
Butane
arrow_right_alt
C4H10
Ethane
arrow_right_alt
C5H12
1
Question 11
11.

This is a hydrocarbon

1
Question 12
12.

This is a hydrocarbon

1
Question 13
13.

This is a hydrocarbon

1
Question 14
14.

This is a hydrocarbon

1
Question 15
15.

This is a hydrocarbon

Question 16
16.

The molecule in the previous question is...

Question 17
17.

A hexane molecule has 6 carbon atoms in the chain. How many hydrogen atoms are there?

Question 18
18.

The chemical formulae for ethane is...

Question 19
19.

Fossil fuels are a renewable resource

Question 20
20.

Crude oil is formed when...

Question 21
21.

Hydrocarbons are compounds made of...

Question 22
22.

What is fractional distillation?

Question 23
23.

Which of the following are examples of components that can be separated using fractional distillation?

Question 24
24.

Fractional distillation is an example of a physical separation technique.

Question 25
25.

The alkanes from crude oil are separated into fractions by fractional distillation.

Explain how this is done and why it separates the alkanes into fractions.

Question 26
26.

Fractions are mixtures of substances with similar boiling points – they are not pure substances. How can you tell that they are mixtures and not pure substances.

Question 27
27.

5.20 kg of crude oil contains 1.53 kg of LPG (Liquefied Petroleum Gas).

Calculate the percentage (%) of LPG in 5.20 kg of crude oil.

Give your answer to 3 significant figures.

Question 28
28.

Describe how a fractioning column separates crude oil.

Question 29
29.

In a fractioning column, compounds are separated by...

Question 30
30.

Where would the least flammable compounds be found?

Question 31
31.

Where would would the most volatile compounds be found?

Question 32
32.

Where would the smallest and shortest alkanes be found?

Question 33
33.

What is fractional distillation?

Question 34
34.

Fractional distillation is an example of a physical separation technique.

Question 35
35.
Describe the relationship shown by the graph and use ideas about forces between molecules to explain this relationship.

1. The more carbons the higher the ____________ point.
2. The _________ carbons the larger the molecules.
3. Larger molecules have ___________ boiling points
4. Larger molecules have larger forces ____________ them
5. The larger the forces between the molecules the more ___________ is required for them to break out of a liquid and become a ________
6. The more energy needed to _____________ the molecules, the higher the boiling point of the hydrocarbon
7. The larger / more the forces between the ______________, the higher the boiling point.
Other Answer Choices:
separate
higher
energy
boiling
between
more
molecules
gas
Question 36
36.
1. Bonds between __________ do not break ;
2. Forces between ______________ (intermolecular forces) are overcome
3. Bonds between atoms are ___________
4. Forces between molecules are _________ ;
Other Answer Choices:
strong
weak
molecules
atoms
Question 37
37.
All alkanes are:
1. _________________ (contain carbon and hydrogen _________
2. ______________ (contain all ___________ bonds)
3. ______________(can be combusted.)
4. have strong _____________ bonds between the __________
5. have weak ___________________ forces between ______________
Other Answer Choices:
hydrocarbons
covalent
flammable
intermolecular
saturated
ONLY
single
atoms
molecules
Question 38
38.

Trends for alkanes as the carbon chain gets longer

  • Flammability
  • Viscosity
  • Melting and boiling points
  • Height of point of condensation in fractional distillation column
  • Volatility
  • strength of intermolecular forces
  • Increase
  • Decreases
Question 39
39.
Alkanes burn in oxygen. Balance the equation for methane burning.

Put numbers in each box - that number could be 1.

_______ CH4 + _______ O2 ⟶ _______ CO2 + _______ H2O
Question 40
40.

Ethene is an alkene.

Which reagent is used to test for alkenes?

Question 41
41.
Here is an equation for cracking. Complete the equation

C30H62 → C10H22 + _______
Question 42
42.
Hydrocarbons can be cracked to produce more useful molecules.

 Complete the sentence.

Choose the answer from these: Alloys Fertilisers Fuels

Some products of cracking are useful as  _______ .
Question 43
43.

From the previous question, What type of chemical reaction takes place when compound X is converted into compounds Y and Z?

Question 44
44.

Compounds Y and Z are both useful substances.Compound Y is unsaturated. Compound Z is saturated.

Suggest one use for compound Y.

Question 45
45.

Question 46
46.

Question 47
47.

Question 48
48.

Question 49
49.

Question 50
50.

Question 51
51.

Question 52
52.

Question 53
53.

Question 54
54.

Question 55
55.

Question 56
56.

Question 57
57.

Question 58
58.

Question 59
59.