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GCSE Chemistry Assessment

In this assessment, we will review your student's comprehension of a variety of GCSE Chemistry topics. This is a timed activity and should take approximately 45 minutes to complete.

'GCSE Chemistry Assessment' worksheet

Key stage:  KS 4

Curriculum topic:  End of Key Stage Assessments

Curriculum subtopic:  Starter Assessment

Difficulty level:  

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Worksheet Overview

QUESTION 1 of 10

In this assessment, we will review your understanding of a variety of GCSE Chemistry topics. This is a timed activity and should take approximately 45 minutes to complete. Don't worry if it takes longer.

How can salt be collected when dissolved in water?

 

evaporation

distillation

osmosis

What is the gas produced from the thermal decomposition of calcium carbonate?

oxygen

hydrogen

carbon dioxide

nitrogen

What do you make by mixing cement with sand and water?

concrete

mortar

clay

What is the maximum total mass (in grams) produced from 100g of reactants?

1g

50g

99g

100g

Which is the most prevalent element in air?

oxygen

carbon dioxide

nitrogen

What substance is ‘cracked’ into petrol?

naphtha

kerosene

paraffin

Select the elements that make hydrocarbons.

 

 

hydrogen

oxygen

nitrogen

carbon

What type of forces hold hydrocarbon molecules together?

intercarbonary

intermolecular

intermolecule

What does sulfur oxide cause in the atmosphere?

deforestation

the ozone layer

acid rain

Select the poisonous gas.

sulfur dioxide

carbon monoxide

carbon dioxide

What is an allotrope?

A substance created by different arrangements of the atoms of the same element.

A substance created by the same arrangement of the atoms of different elements.

A substance that behaves differently depending on where it is placed.

Diamond, graphite and fullerenes are allotropes of which element?

mercury

lithium

carbon

What technique is used to separate colour compounds?

fractional distillation

separation funnel

chromatography

What would you see if you placed a thermometer in a container where an endothermic reaction takes place?

The temperature would increase.

The temperature would decrease.

The temperature would remain stable.

Select the correct option below which completes this sentence:

 

 

In covalent substances intermolecular forces that link the molecules together are... .

very weak

very strong

very strong when the substance melts

Which gases are very stable on their own, and are consequently less reactive?

noble

nable

aristocratic

Why was Mendeleev so successful with the Periodic Table?

He arranged the elements in order of their atomic mass and properties.

He arranged the elements in no particular way.

He was not sure why they were gaps in his periodic table.

What did Moseley change in Mendeleev's Periodic Table which improved it?

He rearranged it in order of atomic mass.

He rearranged it according to elements' properties.

He rearranged the elements in order of atomic number and properties.

Is the following statement true or false?

 

Saturated fatty acids have a double bond between their carbon atoms, whereas unsaturated ones have a single bond.

 

true

false

What metal hydroxide needs to react with sulfuric acid to give iron sulfate?

iron oxide

iron hydroxide

tin hydroxide

Why is mass conserved in chemical reactions?

The number of atoms changes.

The number of molecules is the same.

The number of atoms remains the same but they just swap places.

This is a general chemical equation for when reactants A and B give products C and D.

A + B C + D

 

mass of A = 2g

mass of B = 3g

mass of C = 1g

 

Use the above information to work out the mass of D. Remember, the mass of the products is equal to the mass of reactants.

1g

2g

3g

4g

What is produced at the cathode during electrolysis of dilute sulfuric acid?

sulfur dioxide

hydrogen

oxygen

What is produced at the anode during electrolysis of dilute sulfuric acid?

hydrogen

carbon dioxide

oxygen

What is the salt produced when sulfuric acid reacts with calcium carbonate? Write the two words in the answer box below.

Look at the diagram showing the atoms of hydrogen and helium.

 

 

How would you write the structure of Hydrogen?

H 1e

H 1

H 1,2

Look at the diagram of the atomic structure of sodium (Na).

 

 

How would you write it?

Na 2, 7, 1

Na 2, 8, 1

Na 1, 8, 2

Why do ionic compounds in a liquid state conduct electricity easily?

Their electrons are in a fixed position.

Their electrons open up for electricity to flow through.

Their electrons are free to move.

 

What type of bonding is shown in the diagram above?

covalent

ionic

 

What type of bonding is shown in the diagram above?

ionic

covalent

Which substance has an increased surface area?

solid block of calcium carbonate

powdered calcium carbonate

marble chips (small blocks of calcium carbonate)

Identify a way to increase the concentration of a gas substance.

Squeeze it into a bigger volume.

Squeeze it into a smaller volume.

Increase the temperature.

System X is 'in equilibrium' with system Z. System Y is also 'in equilibrium' with system Z.

State the relationship between systems X and Y according to Law 0 of thermodynamics.

X and Y are not 'in equilibrium'.

X and Y are 'in equilibrium'.

X and Y are independent of each other.

What would be the reason if, in an exam question, it was given that the mass of products is less than the mass of the reactants?

A gas reacted with the initial element.

A gas was produced.

This is impossible, it could never happen.

2.4 g of magnesium gave 4 g of magnesium oxide. How come the mass of the product is bigger than the mass of the reactant?

2 g of oxygen reacted with magnesium.

0.6 g of oxygen reacted with magnesium.

1.6 g of oxygen reacted with magnesium.

Calculate the relative formula mass of calcium carbonate (CaCO3).

 

Relative atomic mass of Ca: 40, C: 12, O: 16

 

Write only the number in the answer box below.

Calcium carbonate is broken down with heat to form calcium oxide and carbon dioxide. 15 g of calcium carbonate produce 8.4 g of calcium oxide.

 

How much carbon dioxide is produced? Write your answer in grams, but only write the number in the box below.

Calculate the percentage yield of a reaction if the actual yield is 5.5 g, but it was predicted that 10 g would be produced.

Copper sulfate can be made from copper oxide and sulfuric acid. The equation for the reaction is:

CuO(s) + H2SO4(aq) = CuSO4(aq) + H2O(l)

QUESTION: 

Describe how you would prepare crystals of copper sulfate from copper oxide and sulfuric acid by putting the followwing statements in the correct order.

Column A

Column B

Copper oxide is added to sulfuric acid, and the mi...
6
Copper oxide is added until in excess.
3
Mixture is filtered.
2
The excess copper oxide separates from the solutio...
4
Solution is evaporated to approximately half volum...
1
The solution is left to crystallise.
5

Compare the three rock types in terms of structure, explaining how they were formed by putting the following sentences in the correct order.

Column A

Column B

Granite is an igneous rock.
7
It is formed when magma/lava cools and solidifies.
3
If it cools slowly granite has large crystals, if ...
2
Limestone is a sedimentary rock.
8
It is formed from compacted layers of sediment ove...
1
Fossils can be found in sedimentary rock.
5
Marble is a metamorphic rock.
6
It is formed when limestone undergoes high pressur...
4
  • Question 1

How can salt be collected when dissolved in water?

 

CORRECT ANSWER
evaporation
EDDIE SAYS
When salt is dissolved in water, the water has to be evaporated in order to collect the salt. This process is called evaporation.
  • Question 2

What is the gas produced from the thermal decomposition of calcium carbonate?

CORRECT ANSWER
carbon dioxide
EDDIE SAYS
Carbon dioxide is the gas produced from the thermal decomposition of calcium carbonate.
  • Question 3

What do you make by mixing cement with sand and water?

CORRECT ANSWER
mortar
EDDIE SAYS
Mortar is made by mixing cement with sand and water.
  • Question 4

What is the maximum total mass (in grams) produced from 100g of reactants?

CORRECT ANSWER
100g
EDDIE SAYS
The law of conservation of mass states that the mass of reactants is equal to the mass of products, so 100 g of products would be given.
  • Question 5

Which is the most prevalent element in air?

CORRECT ANSWER
nitrogen
EDDIE SAYS
78% of the air we breathe is made up of nitrogen.
  • Question 6

What substance is ‘cracked’ into petrol?

CORRECT ANSWER
paraffin
EDDIE SAYS
Paraffin is ‘cracked’ into petrol.
Naphtha and kerosene are both hydrocarbons and are produced during the fractional distillation of crude oil.
  • Question 7

Select the elements that make hydrocarbons.

 

 

CORRECT ANSWER
hydrogen
carbon
EDDIE SAYS
Hydrocarbons are made of hydrogen and carbon.
  • Question 8

What type of forces hold hydrocarbon molecules together?

CORRECT ANSWER
intermolecular
EDDIE SAYS
Intermolecular forces hold hydrocarbon molecules together.
  • Question 9

What does sulfur oxide cause in the atmosphere?

CORRECT ANSWER
acid rain
EDDIE SAYS
Sulfur oxide causes acid rain.
  • Question 10

Select the poisonous gas.

CORRECT ANSWER
carbon monoxide
EDDIE SAYS
Carbon monoxide is a poisonous gas.
Sulfur dioxide is an acid, and carbon dioxide is not poisonous but is expelled from our bodies.
  • Question 11

What is an allotrope?

CORRECT ANSWER
A substance created by different arrangements of the atoms of the same element.
EDDIE SAYS
It is possible to arrange atoms inside an element in a different way and create allotropes of the same element. For example, diamond, graphite and fullerenes are all allotropes of carbon, as they all have different atomic structures.
  • Question 12

Diamond, graphite and fullerenes are allotropes of which element?

CORRECT ANSWER
carbon
EDDIE SAYS
Diamond, graphite and fullerenes are allotropes of carbon.
  • Question 13

What technique is used to separate colour compounds?

CORRECT ANSWER
chromatography
EDDIE SAYS
Chromatography is used to separate coloured compounds. A spot of the mixture is placed on a special piece of paper and it is allowed to soak up a solvent. As it soaks it up the solvent separates the different components because they travel different distances at the same time.
  • Question 14

What would you see if you placed a thermometer in a container where an endothermic reaction takes place?

CORRECT ANSWER
The temperature would decrease.
EDDIE SAYS
A thermometer in a container where an endothermic reaction takes place would show a decrease in temperature.
  • Question 15

Select the correct option below which completes this sentence:

 

 

In covalent substances intermolecular forces that link the molecules together are... .

CORRECT ANSWER
very weak
EDDIE SAYS
In covalent substances intermolecular forces that link the molecules together are very weak and break easily when the substance melts or boils.
  • Question 16

Which gases are very stable on their own, and are consequently less reactive?

CORRECT ANSWER
noble
EDDIE SAYS
Noble gases have complete outer shells and so are very stable.
  • Question 17

Why was Mendeleev so successful with the Periodic Table?

CORRECT ANSWER
He arranged the elements in order of their atomic mass and properties.
EDDIE SAYS
He arranged the elements in order of atomic mass and properties.
  • Question 18

What did Moseley change in Mendeleev's Periodic Table which improved it?

CORRECT ANSWER
He rearranged the elements in order of atomic number and properties.
EDDIE SAYS
In 1913 a British chemist, Henry Moseley, realised that it would be better to use atomic number rather than mass, so he put the final touch on the Periodic Table, after resolving some issues that surfaced from Mendeleev's work.
  • Question 19

Is the following statement true or false?

 

Saturated fatty acids have a double bond between their carbon atoms, whereas unsaturated ones have a single bond.

 

CORRECT ANSWER
false
EDDIE SAYS
Saturated fatty acids have a single bond between their carbon atoms, whereas unsaturated ones have a double bond.
  • Question 20

What metal hydroxide needs to react with sulfuric acid to give iron sulfate?

CORRECT ANSWER
iron hydroxide
EDDIE SAYS
Iron hydroxide needs to react with sulfuric acid to give iron sulfate.
  • Question 21

Why is mass conserved in chemical reactions?

CORRECT ANSWER
The number of atoms remains the same but they just swap places.
EDDIE SAYS
The atoms are the same as before in quality and number, they are just rearranged. The overall mass stays the same.
  • Question 22

This is a general chemical equation for when reactants A and B give products C and D.

A + B C + D

 

mass of A = 2g

mass of B = 3g

mass of C = 1g

 

Use the above information to work out the mass of D. Remember, the mass of the products is equal to the mass of reactants.

CORRECT ANSWER
4g
EDDIE SAYS
mass of reactants = 2 + 3 = 5g
mass of reactants = mass of products = mass of C + mass of D = 5 g
mass of C = 1 g, so mass of D = 5 - 1 = 4 g
  • Question 23

What is produced at the cathode during electrolysis of dilute sulfuric acid?

CORRECT ANSWER
hydrogen
EDDIE SAYS
Hydrogen is produced at the cathode during electrolysis of dilute sulfuric acid:
2H+ + 2e- --> H2.
  • Question 24

What is produced at the anode during electrolysis of dilute sulfuric acid?

CORRECT ANSWER
oxygen
EDDIE SAYS
Oxygen is produced at the anode during electrolysis of dilute sulfuric acid:
4OH- - 4e- --> 2HO + O2.
  • Question 25

What is the salt produced when sulfuric acid reacts with calcium carbonate? Write the two words in the answer box below.

CORRECT ANSWER
calcium sulfate
EDDIE SAYS
Calcium sulfate is produced when sulfuric acid reacts with calcium carbonate.
  • Question 26

Look at the diagram showing the atoms of hydrogen and helium.

 

 

How would you write the structure of Hydrogen?

CORRECT ANSWER
H 1
EDDIE SAYS
Hydrogen has only one electron and that is on the first shell. H is the symbol for Hydrogen.
  • Question 27

Look at the diagram of the atomic structure of sodium (Na).

 

 

How would you write it?

CORRECT ANSWER
Na 2, 8, 1
EDDIE SAYS
Sodium has 2 electrons on the first shell, 8 on the second and 1 on the third.
  • Question 28

Why do ionic compounds in a liquid state conduct electricity easily?

CORRECT ANSWER
Their electrons are free to move.
EDDIE SAYS
Ionic compounds in a liquid state conduct electricity easily, because their electrons are free to move.
  • Question 29

 

What type of bonding is shown in the diagram above?

CORRECT ANSWER
covalent
EDDIE SAYS
The diagram shows the covalent bond of the carbon dioxide molecule.
  • Question 30

 

What type of bonding is shown in the diagram above?

CORRECT ANSWER
ionic
EDDIE SAYS
The diagram shows the ionic bond between Lithium and Oxygen.
  • Question 31

Which substance has an increased surface area?

CORRECT ANSWER
powdered calcium carbonate
EDDIE SAYS
Any substance in a powder form has more surface area.
  • Question 32

Identify a way to increase the concentration of a gas substance.

CORRECT ANSWER
Squeeze it into a smaller volume.
EDDIE SAYS
You can increase the concentration of a gas if you squeeze it into a smaller volume.
  • Question 33

System X is 'in equilibrium' with system Z. System Y is also 'in equilibrium' with system Z.

State the relationship between systems X and Y according to Law 0 of thermodynamics.

CORRECT ANSWER
X and Y are 'in equilibrium'.
EDDIE SAYS
According to Law 0 of thermodynamics, X and Y are 'in equilibrium'.
  • Question 34

What would be the reason if, in an exam question, it was given that the mass of products is less than the mass of the reactants?

CORRECT ANSWER
A gas was produced.
EDDIE SAYS
The reason would be that a gas was produced and escaped into the atmosphere.
  • Question 35

2.4 g of magnesium gave 4 g of magnesium oxide. How come the mass of the product is bigger than the mass of the reactant?

CORRECT ANSWER
1.6 g of oxygen reacted with magnesium.
EDDIE SAYS
1.6 g of oxygen from the air reacted with magnesium.
  • Question 36

Calculate the relative formula mass of calcium carbonate (CaCO3).

 

Relative atomic mass of Ca: 40, C: 12, O: 16

 

Write only the number in the answer box below.

CORRECT ANSWER
100
EDDIE SAYS
You need to add the relative atomic mass of all the atoms that make up the compound. Note that there are three oxygen atoms in calcium carbonate.

40 + 12 + 16 + 16 + 16 = 100

Remember it is always advisable to show your calculations, because even if you may calculate wrongly, you can still gain some marks by showing that your thought process is correct.
  • Question 37

Calcium carbonate is broken down with heat to form calcium oxide and carbon dioxide. 15 g of calcium carbonate produce 8.4 g of calcium oxide.

 

How much carbon dioxide is produced? Write your answer in grams, but only write the number in the box below.

CORRECT ANSWER
6.6
EDDIE SAYS
15 - 8.4 = 6.6 g of carbon dioxide
  • Question 38

Calculate the percentage yield of a reaction if the actual yield is 5.5 g, but it was predicted that 10 g would be produced.

CORRECT ANSWER
55
EDDIE SAYS

= 0.55 x 100 = 55%
  • Question 39

Copper sulfate can be made from copper oxide and sulfuric acid. The equation for the reaction is:

CuO(s) + H2SO4(aq) = CuSO4(aq) + H2O(l)

QUESTION: 

Describe how you would prepare crystals of copper sulfate from copper oxide and sulfuric acid by putting the followwing statements in the correct order.

CORRECT ANSWER

Column A

Column B

Copper oxide is added to sulfuric...
1
Copper oxide is added until in ex...
2
Mixture is filtered.
3
The excess copper oxide separates...
4
Solution is evaporated to approxi...
5
The solution is left to crystalli...
6
EDDIE SAYS
In order to get full marks for this answer, you need to mention the following points:
  • Copper oxide is added to sulfuric acid, and the mixture stirred.
  • Copper oxide is added until in excess.
  • Mixture is filtered.
  • Solution is evaporated to approximately half volume.
  • The solution is left to crystallise.
    • Question 40

    Compare the three rock types in terms of structure, explaining how they were formed by putting the following sentences in the correct order.

    CORRECT ANSWER

    Column A

    Column B

    Granite is an igneous rock.
    1
    It is formed when magma/lava cool...
    2
    If it cools slowly granite has la...
    3
    Limestone is a sedimentary rock.
    4
    It is formed from compacted layer...
    5
    Fossils can be found in sedimenta...
    6
    Marble is a metamorphic rock.
    7
    It is formed when limestone under...
    8
    EDDIE SAYS
    In order to achieve full marks for this question you must include the following points:
  • Granite is an igneous rock.
  • It is formed when magma/lava cools and solidifies.
  • If it cools slowly granite has large crystals, if it cools quickly it has small crystals.
  • Limestone is a sedimentary rock.
  • It is formed from compacted layers of sediment over millions of years.
  • Fossils can be found in sedimentary rock.
  • Marble is a metamorphic rock.
  • It is formed when limestone undergoes high pressure and temperature.
  • ---- OR ----

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