AQA Combined Science Trilogy Chemistry Paper 2 Quiz

Question 1

1 Point

Which of these reasons explains why temperature affects rate of reaction?

Reactant particles at higher temperatures move more quickly, collide more frequently and with enough energy to react
Reactant particles at lower temperatures are struck by rapidly moving electrons, causing the reaction to happen faster
Reactant particles are unaffected by temperature, but the bonds at higher temperatures become weaker leading to an increased rate of reaction
Reactant particles change state and become solids

Question 2

1 Point

When there are more frequent collisions between particles, what will happen to the rate of reaction?

It will increase
It will decrease
It will stay the same

Question 3

1 Point

Increasing the concentration of solutions increases the rate of reaction, why is this the case?

More collisions take place because there are more particles in the same volume
When solutions are more concentrated, the intermolecular forces become weaker and bonds are more easily broken
When solutions are dilute, there are more particles in the same volume
Fewer collisions take place which increases the rate of reaction

Question 4

1 Point

Which of the following symbols is used to represent a reversible reaction?

⇌
←
→
=

Question 5

3 Points

Which of the following are conditions that are used during the Haber process?

Temperature of 100˚C
Temperature of 450˚C
A pressure of 200 atmospheres
A pressure of 50 atmospheres
Presence of an iron catalyst
Presence of a magnesium catalyst

Question 6

1 Point

The environment in which a reaction takes place can affect the direction of the equilibrium shift.

Hydrogen reacts with iodine to form hydrogen iodide. Match the change with the correct outcome.
H₂(g) + I₂(g) 2HI(g)

Equilibrium shifts to the right
Equilibrium shifts to the left

The pressure is increased
The pressure is decreased

Question 7

1 Point

The environment in which a reaction takes place can affect the direction of the equilibrium shift.

Hydrogen reacts with iodine to form hydrogen iodide. Match the change with the correct outcome.
H₂(g) + I₂(g) 2HI(g)

Equilibrium shifts to the right
Equilibrium shifts to the left

H₂ is added
H₂ is removed

Question 8

1 Point

The environment in which a reaction takes place can affect the direction of the equilibrium shift.

A reaction is exothermic in the forwards direction. Match the change in temperature with the correct outcome.

Equilibrium shifts to the left
Equilibrium shifts to the right

Increasing temperature
Decreasing temperature

Question 9

1 Point

There is a dynamic equilibrium formed in the following reaction: nitrogen dioxide ⇌ dinitrogen tetroxide. Which of the following will happen if we add more nitrogen dioxide?

The equilibrium will shift to the right, using up more nitrogen dioxide
The equilibrium will shift to the left, using up more nitrogen dioxide
The equilibrium will remain stable and no more reactions will take place
The equilibrium will shift to the left, using up more dinitrogen tetroxide

Question 10

3 Points

Use the following words to fill in the blanks:

Open, closed, active, dynamic, static

- equilibrium only occurs in systems.
- In an system gases can escape so equilibrium would not be achieved.

Question 11

1 Point

The following equations show cracking of a long hydrocarbon into a shorter alkane and an alkene. Which equation is correct?

C₇H₁₆ → C₅H₁₂ + C₂H₄
CH₁₆ → CH₁₂ + CH₄
C₈H₁₆ → C₅H₁₂ + C₂H₄
C₈H₁₇ → C₅H₁₂ + C₂H₄

Question 12

1 Point

What is the purpose of cracking?

Breaking down larger alkane molecules into smaller alkane molecules and some alkenes
Breaking down larger alkene molecules into smaller alkene molecules and some alkanes
Combining alkanes and alkenes to make fuel for rockets
Breaking up food so its easier to digest

Question 13

1 Point

Which descriptions are accurate about saturated and unsaturated hydrocarbons?

In saturated hydrocarbons the carbon atoms are joined by single bonds (C-C)
In unsaturated hydrocarbons there is a carbon to carbon double bond (C=C)
In saturated hydrocarbons the hydrogens are connected to each other with single bonds (H-H)
In unsaturated hydrocarbons there is a hydrogen to carbon double bond (H=C)

Question 14

1 Point

Which of the following is a difference between alkanes and alkenes?

Alkanes are saturated and alkenes are unsaturated
Alkanes can be used as fuels and alkenes cannot be used as fuels
Alkanes are separated from their neighbours by CH₄ and alkenes are separated from their neighbours by COH₄
Alkenes are the same as alkanes but only in solid form

Question 15

1 Point

Crude oil separated by fractional distillation creates unequal volumes of each fraction e.g. fuel oil. These unequal volumes also do not match the demand for each fraction. What process is carried out to balance out the supply with demand?

Cracking
Fracking
Carbonation
Distillation

Question 16

1 Point

Alkanes all have the same general formula. What is that formula?

CₙH₂ₙ₊₂
CH₂ₙ₊₂
H₂ₙ₊₂
C₂ₙ₊₂Hₙ

Question 17

1 Point

Renewable, non-renewable

Complete the sentence: Methane is a fossil fuel found in natural gas.

Question 18

1 Point

Hydrocarbons are compounds that contain which two elements only?

Carbon
Hydrogen
Helium
Cobalt

Question 19

1 Point

Hydrocarbons with the longest carbon chains have the highest boiling points. Where are the fractions with the smallest carbon chains removed in a fractionating column?

Fractions with the longest carbon chains are removed at the bottom of fractionating columns
Fractions with the longest carbon chains are removed at the top of fractionating columns
Fractions with the longest carbon chains are removed in the middle of fractionating columns
Fractions with the shortest chains are prevented from entering the machine

Question 20

1 Point

Which of the following statements are correct about crude oil?

Crude oil is a complex mixture of hydrocarbons
Crude oil is made mostly of cobalt and water based compounds
Crude oil is a finite resource
Crude oil is an important source of fuels and feedstock for the petrochemical industry
Crude oil is added to drinking water to sterilise pathogens
Crude oil contains molecules with carbon in chains

Question 21

1 Point

Which process do we use to separate crude oil into more useful and simpler mixtures?

Fractional distillation
Filtration
Simple distillation
Evaporation
Crystallisation

Question 22

1 Point

Why is bitumen not a good fuel?

It is too difficult to ignite since it is very viscous (thick)
It is very rare and so makes a bad fuel
It is too expensive to use as a fuel economically
It slowly clogs up car engines and they have to be cleaned too often

Question 23

1 Point

Renewable, non-renewable

Finish the sentence: Petrol, kerosene and diesel oil are fossil fuels obtained from crude oil.

Question 24

1 Point

Which of the following explains dynamic equilibrium?

Dynamic equilibrium is when a reversible reaction achieves a balance, where the forwards and backwards reactions happen at the same rate
Dynamic equilibrium is when one reactant is added in excess and the other is completely converted to the products.
Dynamic equilibrium is before a non-reversible reaction is started
Dynamic equilibrium only happens in open systems and describes the escape of the products as gases

Question 25

1 Point

A paper chromatography experiment is carried out in a lab. The distance moved by the spot was 6cm and the solvent had moved by 8cm. Calculate the Rf value.

0.75
0.5
0.25
0.1

Question 26

1 Point

Can Rf values be higher than 1?

Yes
No
Under certain conditions

Question 27

1 Point

The distance travelled by a spot is determined by the solubility of the compound. How does solubility impact distance travelled?

More soluble – greater distance
More soluble – shorter distance

Question 28

1 Point

What is the equation for Rf values in paper chromatography?

Distance moved by spot / distance moved by solvent
Distance moved by solvent / distance moved by spot
Distance moved by solvent x distance moved by spot
Distance moved by the paper / distance moved by the spot

Question 29

1 Point

Which of the following are uses for paper chromatography?

Separating insoluble solids
Distinguishing between pure and impure substances
Determining the boiling point of a substance
Identifying substances by calculating Rf values
Identifying substances by comparing chromatogram patterns to patterns formed by known substances

Question 30

1 Point

Drag and drop to match the description to the phase of chromatography

Mobile phase
Stationary phase

The solvent
The paper

Question 31

4 Points

Use some of the following words to fill in the blanks.

Earthquakes, volcanism, condensed, rivers, oceans, photosynthesis

- The development of the early atmosphere was mainly from which released gases from inside the Earth.
- The formation of the oceans happened when water vapour in the atmosphere as the Earth cooled.
- A decrease in CO₂ in the atmosphere occurred as CO₂ dissolved into .
- An increase in O₂ in the atmosphere occurred when organisms started the process of

Question 32

1 Point

Which of the following are effects of climate change?

Rising sea levels due to ice in the south pole and in glaciers melting
Extinctions of species unable to migrate or adapt to higher temperatures
More extreme weather events (stronger storms, rainfall and droughts)
Lower pH of oceans due to dissolving carbon dioxide producing carbonic acid
Rising ocean temperatures causing coral bleaching and other adverse effects
Expansion of the stomachs of penguins

Question 33

1 Point

Which steps can we take to reduce the impact of climate change on humanity or prevent further climate change?

Using renewable energies instead of fossil fuels
Carbon capture from the atmosphere and storage underground
Building flood defences
Ensuring clean water supplies for vulnerable communities
Cutting down forests to give humans a new place to live
Pumping water to the Sahara Desert and creating a new place to live

Question 34

1 Point

Which of the following is the chemical test for oxygen?

A glowing splint is relit in a test tube filled with oxygen
An audible squeaky pop is heard when a lit splint is exposed to a test tube full of oxygen
Oxygen is bubbled through limewater and it turns cloudy when oxygen is present
Oxygen smells like rotten eggs

Question 35

2 Points

Use some of the following words:

Magnetic, volcanic, magnetospheres, detritivore, volcanoes

On early Earth, there was a lot of activity as the planet was cooling down. We can link this to the formation of the atmosphere by measuring the gases released by and comparing them to the composition of the atmosphere over time

Question 36

1 Point

Why do historical measurements by humans of global temperature have some uncertainty?

Instruments to measure temperature were not very accurate in the past and have gained more resolution over time
Early scientists were in competition to record the highest temperatures
The longest continuous record of temperature is only available in one place
Humans are very good at guessing the temperature, but only in the morning

Question 37

1 Point

Why is carbon and carbon monoxide produced during incomplete combustion?

Not enough oxygen is present to form carbon dioxide
Oxygen expands rapidly and escapes the reaction before forming carbon dioxide
Incomplete combustion involves burning sulfur and sulfur dioxide is made instead of carbon dioxide
Carbon monoxide is made in both complete and incomplete combustion

Question 38

1 Point

Why does burning of fuel inside an internal combustion engine lead to the production of oxides of nitrogen?

Very high temperatures are required for oxygen to react with nitrogen
High pressures inside the engine causes the reaction
Nitrogen is present in the combustion chamber metal since it is an alloy
Nitrogen is injected by turbochargers to increase the speed of cars on motorways

Question 39

1 Point

Which of the following are causes of acid rain?

Nitrogen oxides
Carbon dioxide
Sulfur dioxide
Diatomic oxygen
Carbon nitrate

Question 40

1 Point

Which of the following are negative effects of acid rain?

Weathering of limestone or marble buildings
Acidification of water bodies
Emission of toxic gases when acid rain interacts with car tyres
Causes corrosion of metals like iron

Question 41

1 Point

Which description best matches complete combustion?

Carbon dioxide and water are produces and energy is given out
Carbon monoxide and carbon are produces as well as water and some energy is given out
Carbon dioxide only is given out
Water and carbon trioxide is given out and some energy

Question 42

2 Points

Which of the following points are advantages of recycling?

Metal ores in the ground will last longer
Recycling can be expensive
Recycling can use lots of energy
Less pollution may be produced from recycling than through extraction of metals from ores

Question 43

1 Point

Drag and drop to match the advantage and disadvantage of recycling compared to extraction from ores

Mining ores damages the landscape
Waste metals can be difficult to sort

Advantage
Disadvantage

Question 44

1 Point

Consider the following hypothetical scenario:

A company that makes electronic devices needs cobalt.
The company is also responsible for the disposal of the devices at the end of their useful lives.
A life-cycle assessment determines that it consumes 10,000 kilojoules per kg to produce cobalt through mining ore and 50,000 kilojoules to produce it from recycling.
The energy required for disposal is 100,000 kilojoules per kg for mined cobalt and only 50,000 kilojoules per kg for recycled cobalt.

What should the company do?

The company should use recycled cobalt
The company should use mined cobalt
The company should use both mined and recycled cobalt

Question 45

4 Points

Use some of the following words to fill in the blanks.

Noise, landfill, river, habitats, dust

Complete the following statements about the advantages of recycling compared to the extraction of metals from ores.
- Mining produces and pollution
- Mining can damage important
- Less waste metal ends up in sites

Question 46

1 Point

A life-cycle assessment determines that 100,000 kilojoules of energy will be consumed to produce 1kg of magnesium from an ore. Alternatively, it would consume 25,000 kilojoules to extract the same mass of magnesium through recycling. Which method should be used given this information?

Recycling
Extraction from ores
Both
Neither

Question 47

1 Point

How could we accurately monitor the rate of a reaction?

By measuring the concentration of reactants and products throughout a reaction
By measuring the temperature throughout a reaction
By measuring the changes in mass of reactants and products
By measuring the changes in volume of reactants and products

Question 48

1 Point

Drag and drop to match the outcome with the type of reaction

Exothermic
Endothermic

If there is no energy input – reactions continue until reactants run out
If there is no energy input – reactions stop even if there are reactants left

Question 49

1 Point

Temperature affects the rate of reaction. Which of the following is the correct description of what happens when temperature changes?

As temperature increases, rate of reaction increases
As temperature increases, rate of reaction decreases
Rate of reaction is highest at very high and very low temperatures
As temperature goes below 0°, rate of reaction reaches its peak

Question 50

1 Point

Surface area to volume ratio affects rate of reaction. Why is that the case?

With higher surface area to volume ratio, there is more surface where collisions can take place
With lower surface area to volume ratio, objects are much hotter and travel faster
With higher surface area to volume ratio, the overall temperature of reactants is lower, this leads to increased collision impact when struck
The volume increases faster than the surface area, so the particles inside react first.

Question 51

2 Points

Ammonia is produced as a reversible reaction between which elements?

Nitrogen
Oxygen
Hydrogen
Chlorine

Question 52

1 Point

Can the process used to obtain ammonia achieve dynamic equilibrium?

Yes, because it is a closed system
No, because it is a closed system
Yes, because it is an open system
No, because it is an open system

Question 53

4 Points

Use some of the following words to fill in the blanks:

Hydrogen, nitrogen, oxygen, chlorine, air, natural, artificial, water

Complete the statements about the elements used in the process to make ammonia:
- is extracted from the .
- is obtained from gas

Question 54

1 Point

Select the accurate statements about alkanes.

Alkanes show gradual variation in physical characteristics – e.g. boiling points
Alkanes have similar chemical properties
Alkanes all have exactly the same chemical formula
Alkanes all exist as a gas at room temperature

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GCSE AQA Combined Science Trilogy Chemistry Paper 2

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