Feb mock

Question 1

Can ionic compounds conduct electricity?

Answer 1

Yes - in a molten or liquid state as the ions are free to move

However, not in a solid state as the ions aren’t able to move.

Question 2

In an investigation with Carboxylic acids, why is it important to connect the gas syringe quickly?

Answer 2

To stop as little gas as possible from escaping.

Question 3

Functional group of esters

Answer 3

COO

Question 4

Three observations when Sodium reacts with water (GP 1 metal)

Answer 4

Sodium moves around the surface of water

Effervescence

Sodium eventually disappears

Question 5

Why is Potassium more reactive than Sodium

Answer 5

-Potassium has one more shell than Sodium

-Therefore the attraction between outer shell and nucleus is weaker,

-meaning it is easier to lose the outer shell and break the attraction.

Question 6

Why is aluminum malleable

Answer 6

Because the layers of ions can slide over each other.

Question 7

What are the conditions needed for cracking

Answer 7

Temperature of 600-700C

Catalyst of Silica

Question 8

How is crude oil separated into fractions?

Answer 8

-The crude oil is heated and vaporized

-The vapor is split into 6 columns based on boiling point, top is the lowest, bottom is the highest.

-The vapors then condense at their boiling points

Question 9

Name two processes that occur before the solid lead iodide forms from crystallisation

Answer 9

Diffusion and dissolving

Question 10

What is meant by the term functional group?

Answer 10

The part of a molecule that gives it its chemical properties.

Question 11

Functional group for carboxylic acids

Answer 11

COOH

Question 12

Functional group for Esters

Answer 12

COO

Question 13

Functional group for alcohols

Answer 13

O-H

Question 14

Substance needed for the fermentation of glucose

Answer 14

Yeast

Question 15

Conditions needed for the fermentation of glucose

Answer 15

Anaerobic conditions (No oxygen)

30-40C so the yeast enzymes are at optimum temperature

Question 16

How do we know when an ester is formed

Answer 16

A fruity smell is given off

Question 17

Give one use of an ester

Answer 17

Used in cheap perfumes

Question 18

Ethanol can be oxidized to produce a carboxylic acid

Give 2 of the reagents used in this oxidation reaction

Answer 18

Dilute sulfuric acid

Potassium Dichromate (IV)

Question 19

Color change in the oxidation of ethanol

Answer 19

Orange —–> Green

Question 20

Why is it better to heat the mixture using a water bath than with a Bunsen burner (Organic II)

Answer 20

Because alcohols are very flammable

Question 21

Structural Formula for ethanol

Answer 21

CH3CH2OH

Question 22

When Butanol reacts with Propanoic acid an ester forms, give the name of this ester

Answer 22

Butyl Propanoate

Question 23

What is the chemical formula of the salt formed when Ethanoic acid reacts with Potassium Carbonate

Answer 23

CH3COOK

Question 24

When an alcohol and a carboxylic acid react they form an ester and?

Answer 24

Water

Question 25

Give two properties of a homologous series

Answer 25

They have similar chemical properties They have the same functional group

Question 26

How do you separate an insoluble solid from a liquid

Answer 26

Filtration

Question 27

How do you separate Pure water from a solution

Answer 27

Simple distillation

Question 28

seperatinga Liquid from a mixture of liquids with different boiling points

Answer 28

Fractional Distillation

Question 29

Soluble solid from a solution

Answer 29

Crystallation

Question 30

What precipitate is formed when you mix potassium chloride and ammonium carbonate

Answer 30

No precipitate

Question 31

What precipitate is formed when you mix magnesium sulfate and barium chloride

Answer 31

Precipitate of Barium Sulfate

Question 32

Test for Potassium

Answer 32

Flame test, dip flame in Dilute HCl then place over flame, flame turns lilac colour

Question 33

Test for Sodium

Answer 33

Flame test, flame turns yellow

Question 34

Carbonate test

Answer 34

Add dilute HCl and if Co2 is given off carbonate is present (test co2 by bubbling gas through limewater)

Question 35

Halide test (Iodide, Chloride, Bromide)

Answer 35

-Add dilute nitric acid -Add silver nitrate -Iodide forms yellow precipitate, Bromide forms cream precipitate and Chloride forms white precipitate

Question 36

Why are enthalpy change experiments carried out in polystyrene.

Answer 36

Polystyrene is a good insulator

Question 37

Why do isotopes of bromine have the same chemical properties

Answer 37

They have the same number of electrons

Question 38

What is a redox reaction

Answer 38

When one substance loses electrons and is oxidized and when the other gains electrons and is reduced.

Question 39

What is a hydrocarbon

Answer 39

A compound that only consists of hydrogen and carbon atoms

Question 40

Why is cracking an important process in the oil industry

Answer 40

Cracking produces shorter chains of hydrocarbons that are more useful Alkanes are made and are useful for fuels Alkenes are made and can be used to make polymers/Plastics