Half Yearly Examination - Educationgcms.skola.edu.mt/exams/hy-2016/Integrated Science... · Half...
Transcript of Half Yearly Examination - Educationgcms.skola.edu.mt/exams/hy-2016/Integrated Science... · Half...
GOZO COLLEGE Secondary School KULLEĠĠ TA’ GĦAWDEX Skola Sekondarja
Half Yearly Exam 2016
Year 8 Levels: 5 - 8 SCIENCE Time: 1:30min
Name: _________________________ Class: Year 8 _____________
Instructions to Candidates Answer all twenty questions. Write only on this paper. Do not spend too much time on any one question only. Good English and orderly presentation are important.
Information to Candidates
The mark of each question is written beside or at the end of each question. Each correct answer carries one mark. The total mark scored will be given as a percentage mark.
Question 1 2 3 4 5 6 7 8 9 10 11 12 13
Maximum 10 3 4 5 7 12 14 4 8 5 11 13 7
Mark
Question 14 15 16 17 18 19 20 Paper total Final mark
100%
Maximum 10 10 5 4 5 5 8 150
Mark
X 0.67 =
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 2 of 12
Use this margin for
working only
Q1. Look at the pictures. Then answer the questions on nutrients. (10 marks)
fish pork chop butter walnut olive oil corn
(Use examples from the pictures above)
a) Name two foods rich in proteins. i. ………… and ii. ………………………….
b) Why are proteins important in our diet? ………………. and …………………..
c) Sugar and starch are rich in which nutrient? …………………………………….
d) Name two foods rich in fat. i. …………………… ii. ……………………………
e) Why are fats important in our diet? ………………………………………………..
f) What are the hazards of too much fat in our diet? ………………………………
g) What do you understand by a balanced diet? ……………………………………
…………………………………………………………………………………………
Q2. People do not always eat a balanced diet. (3 marks) Draw one line from each fact about a person’s diet to the organ it harms. Draw three lines
Fact about the diet Organ harmed
heart
Not enough calcium
intestine
Not enough fibre
lung
Too much fat
bones
Q3. The table shows the mass of water, fat, fibre and vitamin C in 100 g of potato
cooked in three different ways. (4 marks)
a
.
a. Use the table to fill the blanks.
i. Chips are crisper than boiled potatoes because chips contain less ………
ii. Most of the fibre in a baked potato is in the ………………..………………..
Water in
g Fat in
g Fibre in
g Vitamin C
in mg
100g of chips 57 7 2 9 100 g of boiled potatoes 80 Hardly any 1 6 100g of potatoes baked in its skin 63 Hardly any 3 14
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 3 of 12
Use this margin for
working only
b. Use the information in the table to work out how much vitamin C there is in:
i. 200g of chips …………………………………………….. ……….. mg
ii. 200g of potatoes baked in its skin …………………….. ……….. mg
Q4. People in different countries eat different amounts of starch. A scientist compared the amount of starch that people ate to the number of people with cancer of the large intestine. (5 marks)
The scatter graph below shows her results. Look at the scatter graph.
(a) (i) Which country had the greatest proportion of people with cancer of the
large intestine? ………………………………………………………..
(ii) What conclusion could you come to about the effect of eating starch on
getting cancer of the large intestine? ………………………………………
(b) (i) Starch is a carbohydrate. Which two of the following foods are good sources
of starch? Tick the two correct boxes.
bread cheese fish
chicken tomatoes pasta
(ii) What other type of nutrient, needed as part of a balanced diet, keeps the intestine working well and prevents constipation? Tick the correct box.
fat fibre minerals protein vitamins
0 5 10 15 20 30
Number of people, per 100 000, with cancer of the large intestine
Finland
Britain Netherlands
United States
50
100
150
200
250
300
350
400
China
Am
ount o
f sta
rch
eate
n
(g/d
ay)
Ireland
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 4 of 12
Use this margin for
working only
Q5. Fill in the blanks with the given key words. (7 marks)
bones ― cereals ― constipation ― iron― scurvy ―teeth ― vegetables
a. ___________ is a mineral important in making red blood cells.
b. Calcium is important for healthy ___________ and ____________.
c. Two foods rich in fibre are ______________ and ___________.
d. Fibre is important in our diet as it prevents ____________.
e. Vitamin C prevents a condition known as _____________.
Q6. a. Use the given key words to label the digestive system. (6 marks)
anus - gullet - large intestine - mouth - small intestine - stomach
b. Digestion can be mechanical (physical) or chemical.
Mark the type of digestion represented by each function. (6 marks)
Organ Function Type of Digestion
Mechanical Chemical
mouth teeth grind food
saliva changes starch to sugar
stomach acids allow enzymes to break down food
food mixed and squeezed
Small intestine Enzymes from pancreas complete digestion
Bile from liver breaks fat into small drops
B
C
A
E
F
D
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 5 of 12
Use this margin for
working only
Q7. a. Micro-organism can cause infections in the body. (10 marks) Draw straight lines to match each disease to the micro-organism which causes it and to the way the disease is spread.
The first one has been done for you.
Microbe Disease How disease is spread
Bacteria Common flu Eating infected food
Virus Food poisoning Coughing and sneezing
Virus Athlete’s foot Close contact
Fungus Chicken pox Public showers
Bacteria Tuberculosis Blood contact
Virus AIDS Coughing and sneezing
b. The body can defend itself against disease in a variety of ways. Draw straight
arrows to match up each method of defence to the correct description from those listed below: (4 marks)
Body defences Description
Clotting of blood chemical that kills most microbes
Skin made up of white blood cells that kills microbes
Immune system stops most microbes from entering the body
Stomach acid seals wounds quickly to prevent entry of microbe
Q8. This question is about micro-organisms. Tick the correct box. (4 marks)
i. Which is the smallest type of microbe? bacteria fungus virus
ii. Which type of microbes are seen in the diagram?
bacteria fungus virus
iii. Which type of microbes are usually made up of branched threads?
bacteria fungus virus
iv. Which of the following micro-organisms help the bread to rise in baking?
yoghurt starch yeast salt
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 6 of 12
Use this margin for
working only
Q9. a) Micro-organisms can be useful to us. Name two useful types of microbes and write what they are these used for? (2marks)
Name of useful microbe Where it is used
b) Are antibiotics effective against influenza? Explain why. (2marks)
………… ………………………………………………………………………………..
c) How can you lessen the risk of getting salmonella when you cook food which
was frozen? ………………………………………………………………… (1 mark)
d) Name two situations where you need to wash your hands: (2 marks)
i. .…………………………………… ii. ……………………………………………….
e) Scurvy is a disease that sailors often got on long voyages. It was discovered that scurvy could be prevented by eating oranges and lemons. This suggests that scurvy is a disease caused by: tick the correct box. (1 mark)
a microorganism lack of exercise
exposure to sea air a nutritional deficiency
Q10. The diagram shows part of the breathing system.
Use the given key words to name the parts labelled A, B, C and D. (5 marks)
alveolus diaphragm lung rib trachea
Q11. a. Crossmatch organ found in a human body system with function. (4 marks)
Organ Function nose gas exchange lungs muscle that controls breathing diaphragm moistens and filters air
E
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 7 of 12
Use this margin for
working only
b. Which human body system performs these functions? Tick the correct box.
skeletal circulatory digestive respiratory
c. The diagram below shows one alveolus and its blood supply. (3 marks)
(i) Gas A enters the blood from the alveolus. Gas B leaves the blood and enters the alveolus. What are the names of gases A and B?
Gas A is ………………………
Gas B is ………………………
(ii) Give one reason why it is easy for gases to pass across the wall of an alveolus. ……………………. ………………………...…………..…….……..….…………
d. The diagram below shows a nicotine molecule. It contains atoms of three elements. Nicotine in tobacco smoke enters the blood through the alveolus.
(4 marks)
(i) Nicotine is a compound. How does the diagram show this?
……………………………………………….……………………………………………
(ii) When nicotine in a cigarette is burned in air, nitric oxide is formed from the
nitrogen in the nicotine. Look at the elements in nicotine.
Give the names of two other compounds formed when nicotine burns in air.
a. ……………………………………….. and b. ……………………………………..
(iii) Name one reason why smoking is a dangerous habit to health.
…………………………………………………………………………………………
Q12. Fill in the gaps with the given key words. (13 marks)
atom carbon dioxide compound equation formula metals
mixture molecule nitrogen non-metals Periodic simpler symbol
Substances that cannot be broken down into anything ____________ are called
elements. These are made up of only one type of __________. Each element is
represented by a chemical _____________. All the elements are shown in
Gas B
tiny blood vessel
Gas A
Alveolus (air sac)
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 8 of 12
Use this margin for
working only
the _____________ table. The elements on the left side of this table are known
as _____________ whilst those on the right are _____________.
When two or more elements chemically join together, a new type of substance is
formed. Such a substance is called a ______________ and is represented by a
_____________. The smallest particle of a compound is called a
_______________.
A chemical reaction can be shown by a word ___________________.
A ____________ is made up of different substances NOT chemically combined
together. For example, in air there are three gases mixed together: oxygen and
_____________ are elements whilst _______________ is a compound.
Q13. The diagram shows part of the Periodic Table. (7 marks) Use the symbols on the diagram to answer the following questions.
a) Give the symbols for two metals. ........................ and ...............................
b) Give the symbols for two non-metals. ...................... and .............................
c) Give the symbol for an element that is a gas. ………………………........................
d) Give the symbols for two elements that react to make lithium chloride.
.................................... and ....................................
Q14. a. The oldest coin in the world is nearly 3000 years old. Very old coins are
often made from pure gold. What type of substance is pure gold? Tick the correct box. (1 mark)
An element Compound Solvent A mixture
This is a list of the properties of gold.
A Shiny appearance B Very unreactive C Good electrical conductivity
D Yellow colour
Au Gold
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 9 of 12
Use this margin for
working only
b. Use the letters A, B, C and D to answer the following questions. (3 marks)
i) Which property explains why gold coins are not affected by oxygen in the air? …...
ii) Which two properties are true for all metals? …….… and …….…
iii) Draw lines to match each metal to its symbol. (3 marks) Use the information in the table to help you.
Element Symbol
sodium Pb
iron Na
lead Fe
iv) Silver has the symbol Ag. Suggest why the symbol for silver is not Si.
........................................................................................................... (1 mark)
v) Circle the names of two other metals. (2 marks)
sulphur zinc aluminium carbon nitrogen
Q15. Three balloons are filled with three different gases. (10 marks)
a) The diagrams show the particles of gas in each balloon.
How do the arrangements of particles in the balloons show that they are gases?
............................................................................................................................... .
b) Tick the balloon which does not contain any molecules?
argon oxygen carbon dioxide
c) Tick the balloon which contains molecules of an element?
argon oxygen carbon dioxide
d) Tick the balloon which contains molecules of a compound?
argon oxygen carbon dioxide
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 10 of 12
Use this margin for
working only
liquid
Particle layer of insoluble titanium dioxide
e) i) Carbon dioxide is sometimes sold as ‘dry ice’. Dry ice is solid carbon
dioxide. How is the arrangement of particles in dry ice different to the
arrangement of particles in carbon dioxide gas? ………………………………..
…………………………………………………………………………………………
ii) The formula for carbon dioxide is CO2. What do the letters C and O stand for
C = ................................ O = ………………………….
f) Mark the statements about the gases in the balloons true or false?
Statement True False
Argon is a non-metal
Carbon dioxide molecules have more carbon atoms than oxygen molecules
All of the balloons contain compounds
Q16. Fill in the blanks by using some of the words listed below: (5 marks)
solvent dissolving solution insoluble solute
Some people cannot drink tea or coffee without adding sugar to it. The sugar
disappears in the warm water. This process is known as ………………………...
The water, which is the substance that makes the dissolving is called a ……….
Sugar is called the ………………... Since sugar dissolves in water it is
………………………...
Not all solids can dissolve in water. Sand cannot dissolve in water and so it is
……………………………………..
Q17. (a) Samantha opened a tin of white paint. The paint consisted of a liquid and
particles of titanium dioxide that are insoluble in the liquid. The paint had separated into two layers, as shown below. (4 marks)
Tick the correct box.
(i) What type of substance is the paint?
a compound an element a mixture
(ii) What type of substance is titanium dioxide?
a compound an element a mixture
(iii) Why did the particles of insoluble titanium dioxide sink to the bottom?
……………………………………………………………………………………..
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 11 of 12
Use this margin for
working only
(b) Samantha stirred the paint and used it to paint a window frame. She got some of the paint on the glass.
Samantha could not get the paint off the glass with water.
When she used a different liquid called white
spirit the paint came off.
Why could she remove the paint with white
spirit but not with water?
…………………………………………………
………………………………………………………………………………………………..
Q18. Use the words listed below to choose the easiest way of separating the
following mixtures: (5 marks)
filtration magnet distillation chromatography by hand boiling
Mixture Separating method
i If you wanted to separate iron filings from sand
ii Permanent marker ink is best separated by using
iii If I want to separate mud from water
iv To get salt from seawater
v To separate peas from dried beans
Q19. a . Rock salt is a mixture. Pure salt can be separated from rock salt. Sentences A, B, C, D and E describe how pure salt can be obtained from rock
salt. The sentences are not in the correct order.
A Evaporate the water by heating
B Mix the rock salt with water
C Crush the rock salt
D Stir to dissolve the salt
E Filter the mixture
Put the sentences A, B, C, D and E in the correct order.
The first one has been done for you.
b. Does rock salt evaporate when its solution is heated? …………………… (5 marks)
C
Marks in this page:
Integrated Science − Year 8 − Track 5-8 − February 2016 Page 12 of 12
Use this margin for
working only
Q20. The diagram below shows the students’ arrangement of the glassware for carrying out an experiment. (8 marks)
a) What is the name of this separation technique? ……………………………………
b) Which processes occur during this separation method? Tick the correct box.
condensation then evaporation melting then boiling
melting then evaporation evaporation then condensation
c) Name the pieces of apparatus in the diagram labelled X and Y
X is ………………………………... Y is ……………………….…………
d) Where in the diagram would you put the solution you want to separate? ………..
e) What is the purpose of the water that is flowing into and out of the piece of
apparatus labelled Y? ………………………………………………………………...
f) Give the name of the colourless liquid that collects in the test-tube? ……………
g) Name the additional piece of laboratory equipment that is needed to carry out
this experiment. ……………………………………………………………………..
THE END
Thermometer
Water out Y Glass tube
X
Water in Test tube heat