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End of key stage 3 Science Assessment: Chemistry

In this assessment, students will review their understanding of various topics across the Chemistry programmes of study at Key Stage 3. It may take approximately 60 minutes to complete.

'End of key stage 3 Science Assessment: Chemistry' worksheet

Key stage:  KS 3

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'll review your understanding of Chemistry at key stage 3. This is a timed activity and should take approximately 60 minutes to complete. Don't worry if it takes you longer. 

Match the state of matter with the correct particle arrangement. If you can't see the entire sentence in the box, hover your mouse over it.

Column A

Column B

solid
particles are close together in a random pattern
liquid
particles are held fixed together by strong bonds
gas
particles are widely spread

Tick the statement that describes what happens to particles in a liquid when they are heated to their boiling point.

Particles start moving more slowly and freeze.

Particles gain energy to move faster and further, so they escape from the liquid.

Particles lose energy and the liquid evaporates.

Particles move faster and condense into a liquid.

Study the diagram of the atom shown below:

 

 

Use the diagram to correctly identify each particle by using the colours in the diagram. 

Column A

Column B

electron
red
protons
blue
neutrons
yellow

Match the chemical names on the left to the correct descriptions on the right.

Column A

Column B

magnesium oxide
compound
carbon dioxide
compound
silicon
element
methane
element
nitrogen
compound
oxygen
element

A molecule of sulfur dioxide contains sulfur and oxygen atoms. For every sulfur atom the molecule contains two oxygen atoms.

Which of the following is the correct formula of sulfur dioxide?

S2O

SO2

SO

Look closely at the Periodic Table below:

 

 

Which element has an atomic number of 20?

carbon

calcium

chlorine

copper

caesium

Silver can be produced by reacting silver nitrate with zinc metal.

 

Using the table below, fill in the missing parts of the equation:

Silver nitrate + AB + silver

 A B
Missing Words

Which of the following shows a pure compound?

 

A

B

C

D

Look at the pie-chart carefully and use the information to match the percentage of each of the gases in air to the correct elements.

 

Column A

Column B

water vapour
0.97%
oxygen
78%
argon
20%
carbon dioxide
1%
nitrogen
0.03%

How do you know that brown ink contains blue ink? 

Purple is separated into red and blue.

There is a blue dot directly above the point labelled as brown.

There is a blue dot directly above the point labelled as green.

Name a technique that uses evaporation and condensation to separate solvents from solutes.

What will happen if you heat sea water?

The sea water will turn white.

Nothing.

The water will evaporate faster than if left in a dish.

Use the table below to decide whether each of the changes listed is a chemical change or a physical change.

 Chemical change Physical change
Melting
Burning
Evaporating
Dissolving
Condensing

Use the table below to complete these word equations.

Enter your answers in lower case.

 

A + Oxygen  Magnesium oxide

Sodium + Oxygen  B

Calcium + C  Calcium oxide

 Answer
A
B
C

Combustion is the reaction of a fuel with oxygen. This reaction produces lots of energy. Which TWO of the following are not powered by the energy produced by the combustion of a fuel?

car engine

gas boiler

solar powered calculator

wrist watch

gas barbecue

What would you call a compound of zinc with oxygen?

zinc oxygen

zinc oxide

zinc oxidide

Match the substances on the right that would neutralise the substances on the left.

Column A

Column B

vinegar
bicarbonate of soda
sodium hydroxide
hydrochloric acid

Match up the pH numbers to the substances listed on the left.

Column A

Column B

hydrochloric acid
pH 2
vinegar
pH 3
lemon juice
pH 1

Complete the reactions between metals and dilute acid.

Calcium + Hydrochloric acid  →  Calcium Chloride  +  ________

Complete the following equation by typing the name of the missing compound into the text box below:

 

nitric acid +  magnesium oxide  magnesium nitrate + _________

An unknown clear liquid is tested with pH paper (Universal Indicator paper). The pH paper turns a green colour.

Which of the following substances may be the unknown liquid?

sulfuric acid

potassium hydroxide

water

Two teams of students are acting out how the particles in solids and liquids pass on their energy from one particle to another.

Team A linked arms and an energetic boy at one end jiggled about trying to make his line move. This worked well and before long the end person was moving.

Team B held hands and an energetic boy at one end jiggled about trying to make his line move. This did not work very well and no matter how hard the boy tried he couldn't get the end person to move very much at all.

 

What was the energetic boy on Team A and Team B trying to simulate?

a particle with low energy

a particle with high energy

a particle out of line with the others

Choose one of the reactions below that is exothermic.

electrolysis

thermal decomposition

neutralisation

In what direction across the Periodic Table do elements change from solid to liquid and then gas?

left to right

right to left

What was the name of the scientist who developed the periodic table?

Isaac Newton

Albert Einstein

Dimitri Mendeleev

What determines the reaction patterns of the elements?

the number of electrons in their outer shell

the number of protons in their outer shell

the number of protons in their nucleus

What is the name given to the columns of the Periodic Table?

Match each of the metals on the right to the property that they are most associated with on the left. If you can't read the entire sentence in the box, hover your mouse over it.

Column A

Column B

low melting point
copper
malleable
aluminium
high electrical conductivity
mercury
soft
sodium
magnetic
iron

What do non-metal oxides form when they dissolve in water?

alkaline solutions

acidic solutions

Complete this sentence.

As we move from _______________ along each period (row) on the Periodic Table, the oxides of the elements become progressively more acidic.

left to right

right to left

Place the metals in the correct order of reactivity by comparing their reactivity to copper.

Column A

Column B

silver
less reactive
mercury
more reactive
lead
less reactive
gold
more reactive
zinc
less reactive

What is the carbon compound that forms during metal extraction?

carbon trioxide

carbon dioxide

carbon monoxide

What is "polymers" the scientific name for?

non-metals

fibers

plastics

Tick three of the most common elements in the Earth's rocks.

oxygen

silicon

manganate

chlorine

aluminium

Granite is a very hard rock and can be used to make kitchen worktops.

 

Which type of rock is granite?

metamorphic

igneous

sedimentary

A scientist has discovered a new type of rock and has recorded his observations below:

 

The rock is quite soft to the touch and when rubbed produces lots of small grains similar to sand. When tested in the lab it reacts quite strongly with acids to produce a gas. 

 

To which category of rock does this new rock belong?

igneous

sedimentary

metamorphic

What is the process carried out by plants that removes carbon dioxide from the Earth's atmosphere?

What is the most abundant gas in the Earth's atmosphere today?

What percentage of the Earth's atmosphere does oxygen take up today?

78%

21%

1%

Greenhouse gases form a layer in the Earth's atmosphere and trap heat. What does this lead to?

Write two words.

  • Question 1

Match the state of matter with the correct particle arrangement. If you can't see the entire sentence in the box, hover your mouse over it.

CORRECT ANSWER

Column A

Column B

solid
particles are held fixed together...
liquid
particles are close together in a...
gas
particles are widely spread
EDDIE SAYS
The three particle arrangements give the three states of matter their properties. The more energy in the system, the further the particles are apart. That means that solids have particles close (giving them their shape/volume properties) as the solid's energy state is the lowest. Go and check out the others!
  • Question 2

Tick the statement that describes what happens to particles in a liquid when they are heated to their boiling point.

CORRECT ANSWER
Particles gain energy to move faster and further, so they escape from the liquid.
EDDIE SAYS
This is how evaporation takes place; liquid particles gain enough energy to break free from the other particles.
  • Question 3

Study the diagram of the atom shown below:

 

 

Use the diagram to correctly identify each particle by using the colours in the diagram. 

CORRECT ANSWER

Column A

Column B

electron
blue
protons
red
neutrons
yellow
EDDIE SAYS
The clue to which colour the neutrons and protons are can be seen when you look closely at the nucleus.
  • Question 4

Match the chemical names on the left to the correct descriptions on the right.

CORRECT ANSWER

Column A

Column B

magnesium oxide
compound
carbon dioxide
compound
silicon
element
methane
compound
nitrogen
element
oxygen
element
EDDIE SAYS
Most compounds are usually easily identified by their name, but some can have other names. For example, the correct chemical name of methane is carbon hydride.
  • Question 5

A molecule of sulfur dioxide contains sulfur and oxygen atoms. For every sulfur atom the molecule contains two oxygen atoms.

Which of the following is the correct formula of sulfur dioxide?

CORRECT ANSWER
SO2
EDDIE SAYS
Read the text carefully: 'For every sulphur atom the molecule contains two oxygen atoms.' This statement tells you the formula. There is one sulfur atom for two oxygen atoms so the formula is SO2.
  • Question 6

Look closely at the Periodic Table below:

 

 

Which element has an atomic number of 20?

CORRECT ANSWER
calcium
EDDIE SAYS
Calcium has an atomic number of 20. The elements in the Periodic Table are arranged in order of increasing atomic number.
  • Question 7

Silver can be produced by reacting silver nitrate with zinc metal.

 

Using the table below, fill in the missing parts of the equation:

Silver nitrate + AB + silver

CORRECT ANSWER
 A B
Missing Words
EDDIE SAYS
In the description of the reaction only three of the chemicals involved are mentioned in the text. Elements or compounds cannot disappear and all elements contained within the compounds at the start of a reaction must also be contained within the compounds at the end of a reaction.
  • Question 8

Which of the following shows a pure compound?

 

CORRECT ANSWER
C
EDDIE SAYS
Box C shows molecules of a single compound. Box D shows a mixture of compounds while Boxes A and B contain particles of elements only.
  • Question 9

Look at the pie-chart carefully and use the information to match the percentage of each of the gases in air to the correct elements.

 

CORRECT ANSWER

Column A

Column B

water vapour
1%
oxygen
20%
argon
0.97%
carbon dioxide
0.03%
nitrogen
78%
EDDIE SAYS
The air around us is a mixture of different gases. Most of the air that we breathe is nitrogen. The percentages of each gas present in the air varies depending on your location; for example, if you are at the top of a very high mountain the levels of oxygen will be much lower. Worryingly, the percentage of carbon dioxide is now nearer 0.04%.
  • Question 10

How do you know that brown ink contains blue ink? 

CORRECT ANSWER
There is a blue dot directly above the point labelled as brown.
EDDIE SAYS
There is a blue dot directly above the point labelled as brown. This means that this particular brown ink is made of 3 different colours including blue (and a red dye and a yellow dye).
  • Question 11

Name a technique that uses evaporation and condensation to separate solvents from solutes.

CORRECT ANSWER
distillation
EDDIE SAYS
Distillation uses evaporation and condensation to separate solvents from solutes. The solvent is evaporated from the solution (which separates it) and then condensed into a liquid so it can be collected.
  • Question 12

What will happen if you heat sea water?

CORRECT ANSWER
The water will evaporate faster than if left in a dish.
EDDIE SAYS
If you heat sea water, the water will evaporate faster than if left alone as the extra energy causes the water molecules to move faster, causing more collisions in the liquid resulting in more of them gaining enough energy to leave the liquid state as a gas. Salt, of course, is left behind.
  • Question 13

Use the table below to decide whether each of the changes listed is a chemical change or a physical change.

CORRECT ANSWER
 Chemical change Physical change
Melting
Burning
Evaporating
Dissolving
Condensing
EDDIE SAYS
Physical changes are more common in the home than chemical changes. Think about all the different changes that happen in your home especially when cooking dinner.
  • Question 14

Use the table below to complete these word equations.

Enter your answers in lower case.

 

A + Oxygen  Magnesium oxide

Sodium + Oxygen  B

Calcium + C  Calcium oxide

CORRECT ANSWER
 Answer
A
B
C
EDDIE SAYS
Each equation gives you a clue to the answer of the other equations.
  • Question 15

Combustion is the reaction of a fuel with oxygen. This reaction produces lots of energy. Which TWO of the following are not powered by the energy produced by the combustion of a fuel?

CORRECT ANSWER
solar powered calculator
wrist watch
EDDIE SAYS
Solar power harnesses energy from the sun and wrist watches use the energy produced by a chemical reaction within the battery (unless they're wind-up or solar-powered, of course!).
  • Question 16

What would you call a compound of zinc with oxygen?

CORRECT ANSWER
zinc oxide
EDDIE SAYS
A compound of zinc and oxygen is called zinc oxide.
  • Question 17

Match the substances on the right that would neutralise the substances on the left.

CORRECT ANSWER

Column A

Column B

vinegar
bicarbonate of soda
sodium hydroxide
hydrochloric acid
EDDIE SAYS
Acids are neutralised by alkalis/bases and vice-versa so, for example, vinegar (acetic acid) is neutralised by the alkali sodium bicarbonate (more properly called sodium hydrogen carbonate!).
  • Question 18

Match up the pH numbers to the substances listed on the left.

CORRECT ANSWER

Column A

Column B

hydrochloric acid
pH 1
vinegar
pH 3
lemon juice
pH 2
EDDIE SAYS
All acids have pH lower than 7. The lower the pH number the more acidic the substance is.
  • Question 19

Complete the reactions between metals and dilute acid.

Calcium + Hydrochloric acid  →  Calcium Chloride  +  ________

CORRECT ANSWER
hydrogen
EDDIE SAYS
REMEMBER: METAL + ACID ----> SALT + HYDROGEN
  • Question 20

Complete the following equation by typing the name of the missing compound into the text box below:

 

nitric acid +  magnesium oxide  magnesium nitrate + _________

CORRECT ANSWER
water
EDDIE SAYS
Don't forget the water! It isn't spoken about in most reactions and can be easily forgotten, but water is always produced during a reaction such as this: ACID + BASE -----> SALT + WATER
  • Question 21

An unknown clear liquid is tested with pH paper (Universal Indicator paper). The pH paper turns a green colour.

Which of the following substances may be the unknown liquid?

CORRECT ANSWER
water
EDDIE SAYS
Usually, pH paper based on Universal Indicator turns green with a neutral substance, with a pH of 7.
  • Question 22

Two teams of students are acting out how the particles in solids and liquids pass on their energy from one particle to another.

Team A linked arms and an energetic boy at one end jiggled about trying to make his line move. This worked well and before long the end person was moving.

Team B held hands and an energetic boy at one end jiggled about trying to make his line move. This did not work very well and no matter how hard the boy tried he couldn't get the end person to move very much at all.

 

What was the energetic boy on Team A and Team B trying to simulate?

CORRECT ANSWER
a particle with high energy
EDDIE SAYS
The energetic boy was simulating a particle with high energy by moving around lots and lots! The line were other particles demonstrating how easily (or not) energy passes between particles according to their arrangement.
  • Question 23

Choose one of the reactions below that is exothermic.

CORRECT ANSWER
neutralisation
EDDIE SAYS
Apart from combustion, neutralisation is another example of an exothermic reaction - heat is a product of the reaction between the acid and the alkali.
  • Question 24

In what direction across the Periodic Table do elements change from solid to liquid and then gas?

CORRECT ANSWER
left to right
EDDIE SAYS
Elements change from solid to liquid and then gas from the left to the right of the Periodic Table, e.g. lithium ---> bromine ---> argon
  • Question 25

What was the name of the scientist who developed the periodic table?

CORRECT ANSWER
Dimitri Mendeleev
EDDIE SAYS
Dimitri Mendeleev was an incredible scientist, but a rather eccentric man. He had a haircut and a shave only once per year in spring. This kept him cooler in the summer but warmer in the winter!
  • Question 26

What determines the reaction patterns of the elements?

CORRECT ANSWER
the number of electrons in their outer shell
EDDIE SAYS
The number of electrons in their outer shell determines the reaction patterns of the elements according to whether the outer shell is complete (unreactive) or short of electrons.
  • Question 27

What is the name given to the columns of the Periodic Table?

CORRECT ANSWER
groups
group
EDDIE SAYS
The columns of the Periodic Table are called groups.
  • Question 28

Match each of the metals on the right to the property that they are most associated with on the left. If you can't read the entire sentence in the box, hover your mouse over it.

CORRECT ANSWER

Column A

Column B

low melting point
mercury
malleable
aluminium
high electrical conductivity
copper
soft
sodium
magnetic
iron
EDDIE SAYS
All the metals in the Periodic Table have slightly different properties which gives them many different uses.
  • Question 29

What do non-metal oxides form when they dissolve in water?

CORRECT ANSWER
acidic solutions
EDDIE SAYS
Non-metal oxides form acidic solutions when they dissolve in water, e.g. sulfur dioxide dissolves to form sulfurous acid (you get sulfuric acid from a solution of sulfur trioxide).
  • Question 30

Complete this sentence.

As we move from _______________ along each period (row) on the Periodic Table, the oxides of the elements become progressively more acidic.

CORRECT ANSWER
left to right
EDDIE SAYS
As we move from left to right along each period (row) on the Periodic Table, the oxides of the elements become progressively more acidic. Think about it: from the alkali metals (like lithium) towards the non-metals (like sulfur) you move from alkaline metal oxides through to acidic non-metal oxides. Makes sense!
  • Question 31

Place the metals in the correct order of reactivity by comparing their reactivity to copper.

CORRECT ANSWER

Column A

Column B

silver
less reactive
mercury
less reactive
lead
more reactive
gold
less reactive
zinc
more reactive
EDDIE SAYS
Copper can reduce the compounds of mercury, silver and gold, so they are below it in the series. Both lead and zinc can reduce copper oxide, so it is below both those metals. Hydrogen is the only non-metal that is often included in the reactivity series.
  • Question 32

What is the carbon compound that forms during metal extraction?

CORRECT ANSWER
carbon dioxide
EDDIE SAYS
During metal extraction carbon dioxide forms as the metal loses the oxygen to the carbon - carbon dioxide is the most stable oxide of carbon.
  • Question 33

What is "polymers" the scientific name for?

CORRECT ANSWER
plastics
EDDIE SAYS
Polymers is the scientific name for plastics because of the complex nature of their molecular structure.
  • Question 34

Tick three of the most common elements in the Earth's rocks.

CORRECT ANSWER
oxygen
silicon
aluminium
EDDIE SAYS
Three of the most common elements in the Earth's rocks are oxygen, aluminium and silicon. Remember that rock is basically silicon dioxide.
  • Question 35

Granite is a very hard rock and can be used to make kitchen worktops.

 

Which type of rock is granite?

CORRECT ANSWER
igneous
EDDIE SAYS
Granite is a very hard rock that can be polished to a high shine. It can be used to make (very expensive!) kitchen worktops because it is so hard and doesn't react with cleaning chemicals.
  • Question 36

A scientist has discovered a new type of rock and has recorded his observations below:

 

The rock is quite soft to the touch and when rubbed produces lots of small grains similar to sand. When tested in the lab it reacts quite strongly with acids to produce a gas. 

 

To which category of rock does this new rock belong?

CORRECT ANSWER
sedimentary
EDDIE SAYS
The rock is probably a sedimentary rock called limestone or chalk. These rocks, which contain the compound calcium carbonate, react with acids and this is why buildings made from them are being damaged by acid rain.
  • Question 37

What is the process carried out by plants that removes carbon dioxide from the Earth's atmosphere?

CORRECT ANSWER
photosynthesis
EDDIE SAYS
Plants remove carbon dioxide in a process called photosynthesis where carbon dioxide from the air is combined with water from the soil to create sugars.
  • Question 38

What is the most abundant gas in the Earth's atmosphere today?

CORRECT ANSWER
nitrogen
EDDIE SAYS
Nitrogen is the most abundant gas in the Earth's atmosphere today - nearly 80% (4/5) of each breath you take is nitrogen!
  • Question 39

What percentage of the Earth's atmosphere does oxygen take up today?

CORRECT ANSWER
21%
EDDIE SAYS
Oxygen makes up 21 per cent of the Earth's atmosphere today (about one fifth of the air by volume).
  • Question 40

Greenhouse gases form a layer in the Earth's atmosphere and trap heat. What does this lead to?

Write two words.

CORRECT ANSWER
climate change
global warming
EDDIE SAYS
Greenhouse gases form a layer in the Earth's atmosphere and trap heat, which leads to climate change, also termed global warming.
---- OR ----

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