Chemistry PAPER 2 MOCK

Question 1

Name a material that would be suitable for coating the metal wire

Answer 1

polymer

Question 2

There are some concerns that nanoparticles may cause harm if they enter
the human body.
- Suggest one way that nanoparticles can enter the human body.

Answer 2

ANY OF THESE WILL GET YOU THE MARK
breathed in
Absorbed by the skin
consumed within food and drink
medication

Question 3

Suggest one possible risk if nanoparticles enter the human body.

Answer 3

catalyse (harmful) reactions OR
build up and form blockages

Question 4

The student kept the volume of sulfuric acid the same when they repeated the
method at 50°C.
State two other variables that should be kept the same.

Answer 4

Concertation Of acid
Mass of magnesium

Question 5

Which piece of equipment can be used to find the volume of 25cm3
of sulfuric acid?

Answer 5

B) Measuring cylinder

Question 6

State how the student will know that the reaction has finished.

Answer 6

No more bubbles OR
magnesium has gone

Question 7

Give one reason, in terms of particles, why the reaction at 50°C was faster than
the reaction at 30°C.

Answer 7

(particles) have more energy

Question 8

How do you calculate average rate of reaction?

Answer 8

change in concentration, ∆[A], divided by the change in time

Question 9

State, in terms of outer shell electrons, why the noble gases are unreactive

Answer 9

The outer-shell is full

Question 10

Explain why hydrogen and why krypton are not used in airships (3)

Answer 10

hydrogen is flammable (1)
krypton is more dense than air (1)
krypton air ship would not float (1)

Question 11

Mendeleev produced one of the earliest periodic tables.

State why he could not include any of the noble gases in his periodic table.

Answer 11

had yet to be discovered

Question 12

State why in step 1 the wire is dipped in hydrochloric acid and held in a
roaring Bunsen burner flame.

Answer 12

to clean the wire

Question 13

State why in step 2 the wire is dipped in hydrochloric acid again before
dipping it in the copper sulfate crystals.

Answer 13

solid vaporises more easily
OR
solid sticks onto the wire

Question 14

What colour should be seen when the flame test is carried out on copper sulfate?

Answer 14

Blue-green

Question 15

A solution of the copper sulfate was tested in a flame photometer.

(i) Give an advantage of using a flame photometer, rather than a flame test, to
test for copper ions

Answer 15

more {accurate sensitive /
reliable}

Question 16

Use the calibration graph in Figure 7 to find the concentration of copper ions
in this solution.

Answer 16

value consistent with candidate’s line of best fit

Question 17

Draw a line of best fit through the points.

Answer 17

DRAW STAIGHT LINE

Question 18

A student tested an unknown solution for sulfate ions by
1. adding a few drops of dilute sulfuric acid to the unknown solution
2. then adding a few drops of barium chloride solution.
A white precipitate was formed.

The student cannot conclude from this result that the unknown solution contains
sulfate ions.
Explain what the student should change to obtain a valid result.

Answer 18

use hydrochloric acid (rather
than sulfuric acid) (1)

(as) sulfuric acid contains sulfate ions

Question 19

How do you calculate percentage by mass of copper?

Answer 19

(mass of solute / mass of solution) x 100%

Question 20

Fluorine, chlorine, bromine and iodine are elements in group 7 of the periodic table.

(a) (i) State the name given to the group 7 elements

Answer 20

halogens

Question 21

Name one other element that is in group 7.
Use the periodic table on the back of this exam paper to help you

Answer 21

astatine

Question 22

Which element is liquid at room temperature and pressure?

Answer 22

B) Bromine

Question 23

Which element is dark-grey in colour at room temperature and pressure?

Answer 23

D) Iodine

Question 24

How do you calculate the empirical formula?

Answer 24

Divide each mass (or % mass) by the atomic mass of the element (found in the periodic table).
Look at the numbers produced and identify the smallest number.
Divide each result from step 1 by the smallest number.
The resulting numbers is the ratio of each element.

Question 25

Explain, in terms of their electronic configurations, why fluorine reacts with tin more vigorously than chlorine reacts with tin.

Answer 25

fluorine has fewer electron shells (1) (so) electron more easily attracted to nucleus (1)

Question 26

Write the word equation for hydrogen peroxide solution decomposing

Answer 26

hydrogen peroxide -> water + oxygen

Question 27

hydrogen peroxide solution state symbol

Answer 27

aq

Question 27

liquid water state symbol

Answer 27

l

Question 28

Describe what the graph shows about the difference in decomposition of hydrogen peroxide with and without liver.

Answer 28

reaction is faster with liver (1) more {gas/oxygen} produced with liver(1)

Question 28

Describe the test to show the gas produced is oxygen

Answer 28

glowing splint (1) OR relights (1)

Question 28

oxygen gas state symbol

Answer 28

g

Question 29

Complete the missing label on the axis of the graph.

Answer 29

Time in(sec/min)

Question 30

Describe how the apparatus in Figure 12 could be modified to find the volume of gas produced when the liver is added to the hydrogen peroxide.

Answer 30

bung and delivery tube (1) connected to upturned measuring cylinder} (1

Question 31

Propanol can be converted into propanoic acid. What happens to propanol in this reaction?

Answer 31

oxidised

Question 32

Figure 19 Explain the results of the investigation.

Answer 32

ammonium chloride contains ions (1) * in solution ions can move / in solid ions cannot move (1)

Question 33

Explain how Figure 17 shows that dissolving ammonium chloride in water is an endothermic process.

Answer 33

heat (energy) has increased / energy change is positive (1) * (therefore) heat energy has been {absorbed/taken in} (1)

Question 34

Give one safety precaution that should be taken when working with toxic gases in the laboraton

Answer 34

use a fume cupboard

Question 35

Diesel oil is a mixture of hydrocarbons that can be obtained from crude oil. (a) State the name of the process used to separate diesel oil from crude oil.

Answer 35

fractionation

Question 36

What do all homologous series have?

Answer 36

they have the same general formula

Question 37

When fuels such as diesel oil are burned, the high temperatures produced can cause nitrogen and oxygen in the air to form the pollutant nitrogen dioxide. Complete the balanced equation for the reaction. (2) N²+ 2O²

Answer 37

2NO²

Question 38

Explain how the greenhouse effect is caused by the gases produced by the complete combustion of diesel oil. (3)

Answer 38

{carbon dioxide / water} produced (1) * (the gases) absorb heat radiated from earth (1) re-radiate heat back into the atmosphere(1)

Question 39

Explain how acid rain is formed and the harm it can do

Answer 39

sulfur burns at the same time as the hydrocarbon rain water becomes acidic * acid rain damages buildings / statues * damages plants/trees * sulfur reacts with oxygen kills fish/sealife

Question 40

P pour the 50 cm3 water into the polystyrene cup Q add the solid to the water and stir R measure 50 cm3 water using a beaker S measure the initiaThe dissolving of this solid in water is an exothermic change. The experiment is repeated a number of times. Write the steps in the correct order, from left to right.

Answer 40

R P S Q T

Question 41

The dissolving of this solid in water is an exothermic change. The experiment is repeated a number of times. -Compared with the initial temperature of the water, the final temperature of the solution is

Answer 41

always higher

Question 42

State how step R could be changed to measure the volume of water more accurately

Answer 42

use *measuring cylinder*

Question 43

When the pack is squeezed hard the inner bag bursts. Then the pack goes cold. (i) Explain why the pack goes cold.

Answer 43

the solid {dissolves/ reacts with the water}

Question 44

Give the reason why the pack can be used only once.

Answer 44

reaction can only occur once

Question 45

Which ion is shown to be present by the result of test 1?

Answer 45

sodium

Question 46

State the name of the gas given off in test

Answer 46

Carbon dioxide

Question 47

State the name of the ion shown to be present in the white solid by the result of test 2

Answer 47

carbonate

Question 48

State the name of the piece of apparatus labelled Z in Figure 5.

Answer 48

(gas) syringe

Question 49

At the end of the reaction the bung is removed from the conical flask. A glowing splint is put into the gas in the flask. State what you would see.

Answer 49

relight

Question 50

The experiment is repeated under identical conditions but with the catalyst added. (1) In the experiment with the catalyst added

Answer 50

B) water and oxygen are the only products of the reaction

Question 51

Which of the following needs to be done to give a more accurate mass?

Answer 51

A) dry the filter paper and catalyst before finding their mass

Question 52

given mass of catalyst is more effective if it has a large surface area. State how you could increase the surface area of some lumps of solid catalyst.

Answer 52

powder

Question 53

Complete the balanced equation for the reaction and fill in the two missing state symbols......... H2O2(aq) o 2H2O(.............) + O2(.........))

Answer 53

2H2O²(aq) → 2H²O(l) + O2 (g)

Question 54

Nanoparticles are found in some sunscreens. (i) An atom has a radius of about 0.1 nm. A nanoparticle might have a radius of about

Answer 54

50nm

Question 55

A useful property of nanoparticles in sunscreens is that they...

Answer 55

D) prevent harmful UV radiation reaching the skin

Question 56

A small volume of bromine water is added to each of the substances A, B and C and the mixtures shaken. Explain why A and B decolourise bromine water but C does not.

Answer 56

A is {an alkene/ unsaturated/ has C=C/ has double bond} (1) * B is {an alkene/ unsaturated/ has C=C/ has double bond} (1) * C {is alkane/ is saturated/ no C=C/ has no double bond/ has only single bonds}

Question 57

State why ethane is described as a hydrocarbon

Answer 57

contains carbon and hydrogen (atoms) only.

Question 58

TRUE OF FALSE Is crude oil a finite resource?

Answer 58

TRUE

Question 59

The substances ethane, C2H6, octane, C8H18, and pentadecane, C15H32, are all found in crude oil. These substances

Answer 59

are in the same homologous series

Question 60

The separation of crude oil into fractions occurs in a fractional distillation column. Before crude oil is passed into the column it is .............................................................. . During the distillation, vapour rises up the column until it is cold enough for the vapour to form a liquid. The vapour has been .............................................................. .

Answer 60

is.. *Heated* been.. *Condesed*

Question 61

TRUE OR FALSE more carbon atoms per molecule

Answer 61

TRUE

Question 62

State the formula of a molecule of substance

Answer 62

SO²

Question 63

Substance C can be formed by burning an element in oxygen. Write the word equation for this reaction.

Answer 63

hydrogen + oxygen → water

Question 64

Give the letters of the two substances that can be formed by burning an element in oxygen.

Answer 64

B And D

Question 65

The amount of oxygen in the atmosphere has increased since the Earth’s early atmosphere was formed. Explain what has caused this change.

Answer 65

* plants (grow/ evolve (1) * photosynthesis occurs (1)

Question 66

Describe how the amount of carbon dioxide in the Earth’s atmosphere varies within each year.

Answer 66

vice-versa

Question 67

Describe the overall trend in the amount of carbon dioxide in the Earth’s atmosphere from 1985 to 2005.

Answer 67

Increase overtime

Question 68

Why is this wire made of metal?

Answer 68

D) the metal conducts electricity

Question 69

Which type of material would be most suitable for the insulation on this household wire?

Answer 69

polymer

Question 70

Explain, using information from Figure 10, why the ceramic is a suitable material to make a cup that will contain a hot drink of tea or coffee.

Answer 70

drinks contain water,unreactive

Question 71

Poly(ethene) has many uses in everyday life. Large amounts of poly(ethene) are manufactured from ethene produced by cracking fractions obtained from crude oil. Poly(ethene) is used to make many objects. After use it is necessary to dispose of the large amounts of poly(ethene) in these objects. Explain some of the problems associated with the manufacture and disposal of poly(ethene).

Answer 71

Aspect 1: MANUFACTURE *cracking requires a lot of energy * crude oil is finite Aspect 2: DISPOSAL some polymers disposed of in landfill sites * non-biodegradable some plastic ends up as litter/ in oceans * this may be hazardous to wildlife greenhouse gases may cause global warming

Question 72

How to calculate mass number?

Answer 72

neurone + protons

Question 73

Describe what you would see if damp, blue litmus paper is placed into chlorine gas.

Answer 73

(blue litmus) (first turns) red (1) * (then) turns white(1)

Question 74

Describe what is meant by a covalent bond.

Answer 74

* {a pair of / two} (electrons) that shared electron

Question 75

Explain why chlorine is a gas, rather than a liquid, at room temperature.

Answer 75

boiling point is below room temperature / has a low boiling (1) point causes intermolecular forces (1)

Question 76

State why the litmus paper turns red.

Answer 76

Contain hydrogen ion(h)

Question 77

Estimate the melting point of iodine

Answer 77

20 - 301

Question 78

Give the name of one halogen that would react with iron more vigorously than bromine.

Answer 78

chlorine