F311 - Chemistry

Question 1

How was the original periodic table ordered

Answer 1

Relative atomic mass

Question 2

Does thermal stability increase or decrease down group 2?

Answer 2

Increase

Question 3

What are the ways to increase a systems entropy?

Answer 3

Increasing the number of particles

Having a mixture of particles

Add gas

Question 4

What is reforming?

And what catalyst is required?

Answer 4

Alkanes&raquo_space;> Cycloalkanes / Arenes

Platinum on aluminium oxide

Question 5

The shape of a molecule that consists of

3 areas of electron density ( no lone pairs )

And what is the angle?

Answer 5

Trigonal Planar

120 degrees

Question 6

What is the general formula for Cycloalkanes?

Answer 6

C(n)H(2n)

Question 7

State the equation relating energy to frequency

Answer 7

Energy = hv

h = planks constant

Question 7

The shape of a molecule that consists of

4 areas of electron density ( 1 lone pair )

And what angle is it?

Answer 7

Trigonal Pyramidal

107 degrees

Question 8

What are the 3 different types of structural isomers?

Answer 8

Different carbon arrangement

Functional group in a different place

Different functional group

Question 9

What is the bond angle around a doubles bond?

Eg around Ethene

Answer 9

120 degrees ( Planar )

Question 10

A high octane number means what?

Answer 10

The fuel is unlikely to auto ignite

Question 11

What contributes to photochemical smog?

Answer 11

Unburnt hydrocarbons

Nitrogen oxides (NOx)

Question 12

What are the catalysts needed for isomerisation?

Answer 12

Platinum ( on aluminium oxide ) and zeolite

Question 13

What can be done to increase the octane number of a fuel

Answer 13

Introduce branched isomers

Question 14

-890 kJ Mol -1 is a what type of reaction

Answer 14

Exothermic

Question 15

Sulfur dioxide leads to what?

Answer 15

Acid rain

Question 16

A low octane numbers means what?

Answer 16

The fuel is likely to auto ignite

Question 17

Name the features of the atomic Absorption spectra

Answer 17

Coloured background

Black lines

Question 18

State the solubility trends of Hydroxides and Carbonates

Answer 18

Hydroxides - solubility increases as you go down the group

Carbonates - solubility decreases as you go down the group

Question 19

CH3 - CH2 - O - CH2 - CH3

What functional group does this alkane contain?

Answer 19

Ether

Question 20

+890 kJ Mol-1 is a what type of reaction?

Answer 20

Endothermic

Question 21

State what the standard enthalpy change of formation is

Answer 21

The enthalpy change when 1 mole of a compound is formed from its elements under standard conditions

Question 22

What is the benefit of of using hydrogen as a fuel in cars?

Answer 22

Only water is produced

Question 23

What products are created as a result of cracking?

Answer 23

A shorter alkane

A smaller alkene

Question 24

Why are high temperatures and pressure needed for nuclear fusion?

Answer 24

So the nuclei can overcome repulsion So the nuclei can collide and fuse

Question 25

Describe Hess's law

Answer 25

Enthalpy change independent of route As long as conditions are the same