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Year-8-EOY-Revision

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Year 8 EOY Revision
1. People who have emphysema have damaged air sacs in their lungs. The diagrams show a
section through a normal air sac and a section through a damaged air sac.
(a)
gas gas
in out
gas gas
in out
normal air sac
damaged air sac
Gas exchange takes place at the inside surface of the air sac when a person breathes.
(i)
Which two gases are exchanged at this surface of the air sac?
................................................ and ...................................................
1 mark
(ii)
The amount of gas exchanged is smaller in a damaged air sac.
Explain why.
.............................................................................................................
.............................................................................................................
1 mark
(b)
The list shows four substances present in cigarette smoke.
carbon particles
carbon monoxide
nicotine
tar
Choose from the list the substance which:
(i)
causes addiction to smoking cigarettes;
............................................................................................................
1 mark
2.Linda had a piece of red sandstone. She hammered it into pieces and then ground them into a
powder using a pestle and mortar.
She put the powder into a measuring cylinder with water and shook the mixture. The contents settled.
(a)
Linda said her results showed that sandstone is a mixture of two substances.
How could she tell, from the results, that sandstone is a mixture of substances?
.....................................................................................................................
.....................................................................................................................
1 mark
(b)
Linda then poured the cloudy water from the measuring cylinder through filter paper in a filter
funnel.
She said there might be salts dissolved in the colourless, clear liquid that came through the
filter.
(i)
What could Linda do to find out if there were salts dissolved in the colourless, clear
liquid?
.............................................................................................................
.............................................................................................................
1 mark
(ii)
What would she see if there had been salts dissolved in the colourless, clear liquid?
.............................................................................................................
.............................................................................................................
1 mark
(c)
Sandstone is a sedimentary rock. Four stages in the formation of sedimentary rock are listed
below.
They are not in the correct order.
compacted
deposited
weathered
transported
Put these stages in the correct order. One has been done for you.
stage 1 ................weathered................... stage 2 .....................................................
stage 3 ..................................................... stage 4 .....................................................
1 mark
3. (a) Jacquie has a mobile phone. Energy is stored in the battery of the phone.
The drawing shows the battery being charged.
(i)
Which energy transfer takes place in the battery as it is being charged? Tick the correct
box.
chemical to sound
sound to thermal
electrical to chemical
thermal to electrical
1 mark
(ii)
When the battery is fully charged, Jacquie unplugs the phone.
Which energy transfers take place when the mobile phone rings?
Tick the correct box.
chemical to electrical to sound
electrical to chemical to sound
kinetic to electrical to sound
thermal to electrical to sound
(b)
Jacquie can change the ring-tone of her phone.
The diagrams below show the patterns made by four sound waves on an oscilloscope
screen. They are all drawn to the same scale.
Write the letter of the sound wave that matches each of the descriptions below.
(i)
a loud sound with a low pitch
.................
(ii)
a quiet sound with a high pitch .................
(iii)
a loud sound with a high pitch
.................
3 marks
4. The graph represents how antibiotics affect the number of bacteria in the body.
number of
harmful
bacteria in
the body
0
0
1
2
3
4
5
6
7 8 9 10
time, in days
sandwich antibiotics
eaten
started
(a)
Use the graph to explain why the girls did not become ill until the day after eating the
sandwiches.
.....................................................................................................................
.....................................................................................................................
1 mark
(b)
After taking the antibiotics for eight days Jenny was completely better. Explain why she got
better.
.....................................................................................................................
.....................................................................................................................
1 mark
(c)
Leah should have taken the antibiotics for eight days. She felt much better after five days
and stopped taking the antibiotics. Two days later she felt very ill again.
Use the graph to help you explain why Leah became ill again.
.....................................................................................................................
.....................................................................................................................
.....................................................................................................................
.....................................................................................................................
2 marks
(d)
Food will keep longer if it is placed in a refrigerator at 2°C.
Refrigeration does not kill bacteria.
What effect does the low temperature have on bacteria?
.....................................................................................................................
.....................................................................................................................
1 mark
Maximum 5 marks
5. Peter burns a piece of crispbread to find out how much energy is stored in it. Energy from the
burning crispbread raises the temperature of the water in the test-tube.
(a)
Describe one way Peter has arranged the apparatus so that he is working safely.
..........................................................................................................................
..........................................................................................................................
2 marks
(b)
Peter wants to find out if potato crisps contain as much energy as crispbread. He does the
experiment again using a piece of potato crisp.
Suggest two things he must do to make the experiment a fair test.
1. .................................................................................................................
2. .................................................................................................................
1 mark
The table shows some of the nutritional information from a packet of crispbread and a packet
of potato crisps.
100 g of
crisp bread
100 g of
potato crisps
(c)
energy
in kJ
protein
in g
carbohydrate
in g
fat
in g
fibre
in g
1455
11.6
58.1
7.3
14.7
2072
5.8
57.9
28.7
4.3
Peter burns 1.0 g of potato crisp instead of 1.0 g of crispbread in a similar experiment. What
result will he get when he burns the potato crisp? Tick the correct box.
The change in the temperature of the water will be greater.
The change in the temperature of the water will be the same.
The change in the temperature of the water will be smaller.
There will be no change in the temperature of the water.
1 mark
(d)
(i)
Fibre contains energy. Explain why this energy can not be used by the human body.
.................................................................................................................
.................................................................................................................
1 mark
(ii)
Use the table in part (b) to give two reasons for choosing crispbread rather than potato
crisps as part of a balanced diet.
1. .............................................................................................................
.................................................................................................................
2. .............................................................................................................
.................................................................................................................
2 marks
(e)
Crispbread does not contain vitamin C. Which of the foods in the list below is the best source
of vitamin C?
Tick the correct box.
cheese
eggs
fish
oranges
1 mark
6. The drawing shows a water lily and some waterweed growing in a pond.
flower
water
lily
floating
leaf
surface of pond
stalk
X
waterweed
Y
roots
(a)
Waterweed grows well at Y but not at X. Why is this?
Tick the correct box.
There is not enough food at X.
There is not enough light at X.
There is not enough oxygen at X.
There is not enough water at X.
1 mark
(b)
Which named part of the water lily produces seeds?
.....................................................................................................................
1 mark
(c)
The drawing shows part of a food web in a pond. Use the information in the drawing to
answer the questions.
(i)
Write three names from the food web to make a food chain which ends with pike.
..............................  ..............................  ..............................  pike
1 mark
(ii)
Write the name of one predator in the food web and the name of one of its prey.
Predator: ..............................................................................................
Prey:
..............................................................................................
2 marks
(d)
Fish have gills and fins. How do these help the fish to live in water?
Gills are for ...................................................................................................
......................................................................................................................
Fins are for ...................................................................................................
......................................................................................................................
7. (a) Debbie put a paper cup into a glass beaker.
She glued a magnet in the bottom of the paper cup.
She glued another magnet in the bottom of the beaker.
The magnets repelled.
2 marks
paper cup
N
magnet
S
S
magnet
glass beaker
N
diagram A (not to scale)
What two forces act on the paper cup and its contents to keep it in this position?
1. ...........................................................
1 mark
2. ...........................................................
1 mark
(b)
Debbie put 5 g of aluminum rivets into the paper cup.
It moved down a little as shown in diagram B.
N
aluminium
rivets
S
S
N
diagram B (not to scale)
(c)
Debbie removed the 5 g of aluminium rivets and put 5 g of iron nails into the cup.
N
S
iron
nails
S
N
diagram C
(not to scale)
The paper cup moved down more with 5 g of iron nails than with 5 g of aluminium rivets as shown
in diagram C. Give the reason for this.
.....................................................................................................................
.....................................................................................................................
1 mark
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