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Key Stage 3 Science
Year 7
Easter revision CHEMISTRY
Name:
Class:
Author: Science Team
Date: 23/03/17
Time: 60 minutes
Marks: 60 marks
Comments: Mark the test using the mark scheme and make a list of topics that you have not performed well on.
Topics I need to improve on:
Q10. There are millions of different substances that make up our world. All these substances are made from chemical elements.
(a) What is an element?
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(1)
(b) Many substances are compounds. What is a compound?
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(2) (Total 3 marks)
Q11. (a) Methane can be a gas, a liquid or a solid. In the diagram below, arrows P, Q, R and S represent changes of state.
The boxes on the right show the arrangement of particles of methane in the three different physical states. Each circle represents a particle of methane.
(i) Draw a line from each physical state of methane to the arrangement of particles in that physical state. Draw only three lines.
1 mark
(ii) Arrows P, Q, R and S represent changes of state. Which arrow represents:
evaporation? ............................................................
melting? ................................................................... 2 marks
(b) Methane is the main compound in natural gas. The scale below shows the melting point and the boiling point of methane.
Methane has three physical states: solid, liquid and gas.
(i) What is the physical state of methane at –170°C?
............................................................. 1 mark
(ii) The formula of methane is CH4. The symbols for the two elements in methane are C and H.
Give the names of these two elements.
element C .............................................
element H ............................................ 2 marks
(iii) When methane burns, it reacts with oxygen. One of the products is water, H2O.
Give the name of the other product.
.............................................................. 1 mark
Maximum 7 marks
Q12. The list below shows properties that different elements can have.
• magnetic
• can be compressed
• very high melting point
• very low melting point
• good conductor of heat
• poor conductor of heat
• good conductor of electricity
• poor conductor of electricity
(a) Which two properties from the list above make aluminium suitable for saucepans?
1. .................................................................................................................
2. ................................................................................................................. 2 marks
(b) Which property in the list above explains why:
(i) copper is used in the cable of a television?
............................................................................................................. 1 mark
(ii) a lot of oxygen gas can be pumped into a very small container?
............................................................................................................. 1 mark
Maximum 4 marks
Q13. (a) The diagram below shows part of the periodic table of elements.
The shaded area contains only metal elements.
Two other areas also contain only metal elements.
Which areas contain only metal elements? Tick the two correct boxes.
A B C D E 1 mark
(b) Copper is a metal.
At room temperature copper is a strong solid. Give two other properties of copper that show it is a metal.
1. ....................................................................................................................
1 mark
2. ....................................................................................................................
1 mark
(c) When copper metal is heated it reacts with a gas in air.
What is the chemical name of the product formed when copper reacts with
a gas in air?
...................................................... 1 mark
(d) Which statement below describes what happens in a chemical change but not in a physical change?
Tick the correct box.
The product is a solid.
The change only happens at a high temperature.
The atoms have combined in a different way to make a new substance.
The types of atoms at the start are the same as in the end product.
1 mark maximum 5 marks
Q14. The drawing shows a gold mask from a tomb in Egypt. The gold is still shiny after thousands of years.
(a) What is pure gold? Tick the correct box.
a compound a mixture
an element a solution 1 mark
(b) The list shows some of the properties of gold.
It conducts electricity. It melts at 1064°C. It is yellow.
It is easily scratched. It stays shiny. It conducts heat.
(i) Which one of these properties shows that gold does not react with oxygen in the air?
............................................................................................................. 1 mark
(ii) Which two of the properties above are properties of all metals?
1. .........................................................................................................
2. ......................................................................................................... 2 marks
(c) Old iron objects from tombs in Britain are often covered with rust. Iron reacts with oxygen when it rusts.
What else is needed for iron to go rusty? Choose one substance from the list below.
lead nitrogen carbon dioxide water
................................................................... 1 mark
(d) A box contains a collection of metal objects from a tomb.
What piece of equipment would you use to separate the iron objects from the other metal objects?
............................................................... 1 mark
Maximum 6 marks
Q15. Jill bought a can of Wax Seal to spray the parts underneath her car.
Wax Seal helps to prevent these parts rusting.
It is a mixture of wax and a liquid called white spirit.
(a) (i) The body of Jill’s car is made from steel. Steel contains iron.
Give two substances that are needed for iron to rust.
1. .................................................. 1 mark
2. .................................................. 1 mark
(ii) How does Wax Seal help to protect the car from rusting?
...............................................................................................................
...............................................................................................................
1 mark
(iii) Wax Seal can also be used on the upper parts of a car.
What else protects parts such as the doors from rusting?
................................................................................................................
1 mark
(b) The metal parts of a car may corrode.
What type of air pollution could cause corrosion?
.............................................. 1 mark
(c) The diagram below shows the mixture of particles of wax and white spirit in Wax Seal.
not to scale
After Jill sprays the car, the white spirit evaporates leaving a layer of solid wax on the surface.
(i) In the box below, draw eight circles, , to show the arrangement of particles in a gas.
particles in a gas 1 mark
(ii) In the box below, draw eight circles, , to show the arrangement of particles in a solid.
particles in a solid 1 mark
maximum 7 marks
Q16. (a) Ruth put a piece of a different metal in each of four test tubes.
She poured 10 cm3 of hydrochloric acid onto each metal.
Look at the diagrams above.
(i) How do these show if a metal reacts with the acid?
...............................................................................................................
1 mark
(ii) On the lines below, put the four metals in the order of how strongly
they react with the acid.
most reactive ..................................
..................................
..................................
least reactive .................................. 1 mark
(b) Choose the name of a metal from the box below to answer each question.
copper iron magnesium zinc
(i) Which metal from the box is used for electrical wires?
................................................... 1 mark
(ii) Which metal from the box goes rusty?
................................................... 1 mark
maximum 4 marks
Q17. Leanne had four rods, each made from a different metal.
She wanted to find out which metal was the best conductor of heat.
The diagram shows some of Leanne’s equipment.
(a) Leanne’s results are shown in the table.
metal rod time for metal ball to
drop off (seconds)
brass 36
copper 24
lead 246
iron 132
What measuring equipment did Leanne use to get her results?
...................................................................................................................... 1 mark
(b) Give two things Leanne must do to carry out a fair test.
1 ...................................................................................................................
2 ................................................................................................................... 2 marks
(c) Which metal in the table was the best conductor of heat? Tick the correct box.
brass
copper
iron
lead
1 mark
(d) Leanne left the rods in the water for a week. One of the metal rods went rusty.
Which metal rod went rusty? Tick the correct box.
brass
copper
iron
lead
1 mark maximum 5 marks
Q18. Susie cooked sausages on a barbecue.
(a) Fat and water in the sausages changed state.
Draw one line from each statement to the correct change of state. Draw only two lines.
statement change of state
2 marks
(b) Susie uses charcoal as the fuel for the barbecue.
(i) Which statement is true about all fuels? Tick the correct box.
All fuels are sources of energy.
All fuels are black.
All fuels are made from wood.
All fuels are solid.
1 mark
(ii) Which gas in the air is needed for fuels to burn? Tick the correct box.
water vapour
oxygen
nitrogen
carbon dioxide
1 mark
(c) The metal grill of the barbecue is made of steel.
Six properties of steel are given below.
Which properties are needed for the metal grill? Tick two correct boxes.
It conducts electricity.
It is rigid.
It has a very high melting point.
It is magnetic.
It is shiny.
It rusts.
2 marks maximum 6 marks
Q19. Meera poured 7 cm3 of water into a measuring cylinder.
She poured 7 cm3 of melted wax into another measuring cylinder. She put both measuring cylinders into a freezer for 24 hours.
(a) Look at the measuring cylinders. What happened to the volume of the water and the wax after freezing?
the volume of water ...........................................................
the volume of wax ............................................................. 1 mark
(b) The measuring cylinders were taken out of the freezer and left in a room at 20°C.
• Frozen water melts at 0°C.
• Wax melts at 53°C.
What would the physical state of each substance be at 20°C?
Choose from gas or liquid or solid.
water ...........................................................
wax ............................................................. 2 marks
(c) Meera added blue copper sulphate crystals to some water in a beaker. The copper sulphate dissolved in the water.
(i) Give one way Meera could see that the copper sulphate had dissolved in the water.
...............................................................................................................
1 mark
(ii) Give one way that she could get the copper sulphate to dissolve
more quickly.
...............................................................................................................
1 mark
(d) Meera poured some of the copper sulphate solution into a dish. She left it in a warm room for a week.
A week later there was a blue solid but no liquid in the dish.
(i) What happened to the water in the copper sulphate solution?
...............................................................................................................
1 mark
(ii) What was the blue solid left in the dish?
............................................................. 1 mark
maximum 7 marks
Q20. (a) Air is a mixture of gases. The pie chart represents the percentages of different gases in air.
On the line by each section of the pie chart, write the name of the correct gas. Two have been done for you.
not to scale
2 marks
(b) On a cold day, droplets of water form on a cold window.
Explain how these droplets form.
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2 marks
(c) The word equation below represents a process taking place in the cells of the human body.
glucose + oxygen ? carbon dioxide + water
(i) What process does this word equation represent?
............................................................. 1 mark
(ii) As a result of this process, the proportions of oxygen and carbon dioxide in air breathed in and air breathed out change.
Which one of the statements below is true? Tick the correct box.
1 mark
maximum 6 marks
Mark Scheme
M10. (a) a substance which contains one type of atom or a substance that cannot be broken down into anything simpler
for 1 mark 1
(b) more than one element/more than one type of atom combined/join together/bonded
for 1 mark each 2
[3]
M11. (a) (i)
all three lines must be correct for the mark 1 (L6)
(ii) evaporation: P 1 (L5)
melting: R 1 (L5)
(b) (i) liquid 1 (L6)
(ii) carbon 1 (L6)
hydrogen 1 (L6)
(iii) carbon dioxide
accept ‘CO2’
accept ‘carbon monoxide’ or ‘CO’
accept ‘carbon’ or ‘soot’
answers must be in the correct order 1 (L6)
[7]
M12. (a) very high melting point
answers may be in either order 1 (L3)
good conductor of heat
do not accept ‘good conductor’ 1 (L3)
(b) (i) good conductor of electricity
do not accept ‘good conductor’ 1 (L3)
(ii) can be compressed 1 (L4)
[4]
##
(a) • B C
both answers are required for the mark if more than two boxes are ticked, award no mark
1 (L6)
(b) any two from
• it conducts electricity
• it conducts heat
one mark may be awarded for ‘it is a good conductor’ if a reference to heat or electricity is not given
• it is ductile or malleable
‘it bends’ is insufficient
• it has a high melting or boiling point
accept ‘it is shiny’ accept ‘it is sonorous’ accept ‘it forms basic oxides’ ‘it is strong or hard’ is insufficient
2 (L5)
(c) copper oxide
accept ‘CuO’ do not accept ‘copper dioxide’
1 (L6)
(d) The atoms have combined in a different way to make a new substance.
if more than one box is ticked, award no mark 1 (L6)
[5]
M14. (a) an element
if more than one box is ticked, award no mark 1 (L4)
(b) (i) it stays shiny 1 (L3)
(ii) it conducts electricity 1 (L3)
it conducts heat
answers may be in either order
accept ‘it conducts’ for one mark if neither of the fully correct answers is given
accept ‘it stays shiny’ 1 (L3)
(c) water 1 (L4)
(d) any one from
• a magnet
• an electromagnet 1 (L3)
[6]
M15. (a) (i) • oxygen 1 (L6)
• water 1 (L6)
answers may be in either order
‘air’ is insufficient
‘moisture’ or ‘dampness’ or ‘wet’ are insufficient
(ii) any one from
• it prevents contact between the steel or the car and oxygen or water
• it is waterproof or water runs off
accept ‘it prevents air getting to the car’
accept ‘wax fills scratches or chips where paint is damaged’
‘it forms a protective layer’ is insufficient 1 (L5)
(iii) any one from
• paint
• chrome
accept ‘they are coated in zinc’ or ‘they are galvanised’
accept ‘polish’
‘rust treatment’ is insufficient
‘cover it’ is insufficient 1 (L5)
(b) • acid rain
accept ‘sulphur dioxide’
accept ‘oxides of nitrogen’
accept ‘car exhaust fumes’
accept ‘burning fossil fuels’
accept ‘sea air’ or ‘salty air’ or ‘salt’
‘carbon dioxide’ is insufficient 1 (L6)
(c) (i) • gas: particles randomly arranged and most not touching
accept black shaded circles if drawn correctly
accept fewer or more than 8 circles if the arrangement is clear
ignore arrows attached to circle 1 (L6)
(ii) • solid: particles regularly arranged and all touching
accept white circles if drawn correctly
accept 2 rows of particles with at least 2 particles in the second row
accept fewer or more than 8 circles if a regular arrangement is clear
ignore location of circles in box
do not accept a single row of circles 1 (L6)
[7]
M16. (a) (i) any one from
• bubbles
• fizzing
accept ‘effervescence’
• gas is given off
‘metal goes into solution or turns into a salt’ and ‘there would be a rise in temperature’ are insufficient answers as they are not shown in the drawings
1 (L3)
(ii) • magnesium
accept ‘Mg’
• zinc
accept ‘Zn’
• iron
accept ‘Fe’
• copper
accept ‘Cu’
answers must be in the correct order
all four answers are required for the mark 1 (L4)
(b) (i) • copper
accept ‘Cu’ 1 (L3)
(ii) • iron
accept ‘Fe’ 1 (L4)
[4]
##
(a) • stopwatch
accept ‘stopclock’ accept ‘timer’
‘timer’ is accepted here and not in Paper 1 question 1, as ‘time’ is not mentioned in this question
accept ‘clock with a second hand’
‘clock’ is insufficient 1 (L3)
(b) any two from
• same length of rods
accept for one mark ‘the rods are the same
‘same temperature or volume or container or rod’ is insufficient
• same thickness of rods
size’ if not given with either ‘same length’ or ‘same thickness’
• same sized balls or same metal balls
• same amount of wax
• same type of wax
• the ends of all rods (in the water) are at the same temperature
accept ‘same length (of rod) in water’
• she put the water in after sticking the balls on 2 (L4)
(c) • copper
if more than one box is ticked, award no mark 1 (L4)
(d) • iron
if more than one box is ticked, award no mark 1 (L4)
[5]
M18. (a)
•
•
if more than one line is drawn from either ‘fat melted’ or ‘water evaporated’, award no mark for that statement
2 (L3)
(b) (i) • All fuels are sources of energy.
if more than one box is ticked, award no mark 1 (L3)
(ii) • oxygen
if more than one box is ticked, award no mark 1 (L4)
(c) • It is rigid.
• It has a very high melting point.
if more than two boxes are ticked, deduct one mark for each incorrect tick minimum mark zero
2 (L4)
[6]
M19. (a) • water: increased or went up
accept ‘expanded’
accept a reading greater than 7 (cm3) and less than or equal to 8 (cm3)
• wax: decreased or went down
accept ‘contracted’ accept a reading lower than 7 (cm3) and greater than or equal to 5.5 (cm3)
both answers are required for the mark 1 (L3)
(b) • water: liquid 1 (L4)
• wax: solid 1 (L4)
(c) (i) any one from
• the liquid had turned blue
accept ‘the colour changed’
accept ‘the water was blue or coloured or grey’
‘it formed a solution’ is insufficient
• crystals or copper sulphate or solid could not be seen
accept ‘the crystals disappeared’
• there was no solid left 1 (L3)
(ii) any one from
• stir it
accept ‘shake it’ or ‘mix it’
• heat it
• use warm water
accept ‘use hotter water’ accept ‘add more water’
do not accept ‘put less in’ 1 (L3)
(d) (i) it evaporated
accept ‘it went into the air’ 1 (L4)
(ii) copper sulphate
accept ‘crystals’ accept ‘sulphate’
1 (L3)
[7]
M20. (a)
2 (L6)
(b) • water vapour
accept ‘vapour’
‘water’ or ‘moisture’ are insufficient 1 (L5)
• condenses
accept ‘turns into water or a liquid’
accept ‘forms condensation’ 1 (L5)
(c) (i) respiration 1 (L6)
(ii) Air breathed out has more carbon dioxide and less oxygen than air breathed in.
if more than one box is ticked, award no mark 1 (L6)
[6]
