END-OF-YEAR EXAMINATIONS SCIENCE 14 June 2011 3rd FORM …€¦ ·  · 2012-05-04END-OF-YEAR EXAMINATIONS SCIENCE 14 June 2011 3rd FORM ... 2 CHEMISTRY SECTION ... Fahrid measured

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END-OF-YEAR EXAMINATIONS

SCIENCE

14 June 2011 3rd FORM

Time allowed: 1.5 hours

150 Marks

NAME: ……………………………………………………………………………… FORM: ........................................................................................................... TEACHER: …………………………………………………………………………

ANSWER ALL QUESTIONS.

THERE ARE 15 QUESTIONS.

THE USE OF CALCULATORS IS ALLOWED.

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CHEMISTRY SECTION

You are advised not to spend more than 30 minutes on this section

1. Which of the drawings A-E shows:

a) A pure element…………………………………………….

b) A pure compound………………………………………….

c) A mixture of an element and a compound………………...

d) A mixture of two elements………………………………..

e) A mixture of two compounds……………………………..

f) Oxygen……………………………………………………

(Total 3 marks)

A B C

D E F

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2. The table below shows the melting and boiling points of some common substances.

Substance Melting point (oC) Boiling point (oC)

Aluminium 660 2467

Helium -272 -269

Lead 328 1740

Nitrogen -210 -196

Water 0 100

Room temperature is about 25 oC.

(a) (i) Which of the substances in the table above would be solids at room

temperature?

(1)

……………………………………………………………………………………………...

(ii) What do you notice about the melting points of these solids?

(1)

……………………………………………………………………………………………...

(b) (i) Which of the substances in the table would be gases at room temperature?

(1)

……………………………………………………………………………………………...

(ii) What do you notice about the boiling points of these substances?

(1)

……………………………………………………………………………………………..

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(c) Use the data in the table to explain why water is a liquid at room temperature.

(2)

………………………………………………………………………………………………………………

………………………………………………………………………………………………………………

………………………………………………………………………………………………………………

(Total 6 marks)

3. This question should be read carefully and answered precisely.

You are provided with the table of data below:

Solid Solubility in water Solubility in alcohol

Sand None None

Sodium Chloride (salt) Good None

Silicon None Good

What method would be most suitable for obtaining pure sand from a mixture of

sand, sodium chloride and silicon? Use may use bullet points to answer this

question. (HINT: FOCUS ON OBTAINING PURE SAND AND NOT ANYTHING

ELSE)

........................................................................................................................................................

...................................................................................................................................................

.……................................................................................................................................................

........................................................................................................................................................

........................................................................................................................................................

........................................................................................................................................................

........................................................................................................................................................

........................................................................................................................................................

(Total 4 marks)

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4. (a) Complete the following table about the particle found in an atom:

(3)

Particle Charge Mass

Proton

Neutron

Electron

(b) Fill in the blanks use words form the box. You may use each word more than

one time.

(6)

The number of protons in one atom of an element determines the atom’s

____________________, and the number of electrons determines the

_________________________ of the element. The atomic number tells you the number of

___________________________ in one atom of an element. It also tells you the number

of __________________________ in a neutral atom of that element. The atomic number

gives the “identity” of an element as well as its location on the periodic table. No two

different elements will have the ____________________ atomic number. The

______________________ of an element is the average mass of an element’s naturally

occurring atom, or isotopes, taking into account the ____________________ of each

isotope. The _______________________ of an element is the total number of protons and

neutrons in the ___________________ of the atom. The mass number is used to calculate

the number of ______________________ in one atom of an element. In order to calculate

the number of neutrons you must subtract the ______________________ from the

______________________.

atomic number mass number reactivity same protons

neutrons mass identity nucleus electrons

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(c) Fill in the following table.

(11)

Entry Symbol Atomic

number

Mass

number

Number

of

protons

Number

of

electrons

Number

of

neutrons

A Hg 80 201

B Mo 42 96

C 29

D C 14

E 15 31

F Na 11 23

(d) For entries E and F DRAW the atom showing ALL the electrons and the way they

are arranged.

(4)

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(e) Entry F loses one electron to form a cation.

(i) Define the word ‘cation’.

(1)

…………………………………………………………………………………………………

…………………………………………………………………………………………………

(ii) Do you expect the radius of the cation to be smaller or bigger than the radius of

the atom? Explain your answer.

(3)

…………………………………………………………………………………………………

………………………………………………………………………………………………….

…………………………………………………………………………………………………

………………………………………………………………………………………………….

(Total 8 marks)

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5. (a) Write chemical formulas for the compounds in each box. The formulae are found

by finding the intersection between the cations and the anions. Only fill in the

SHADED boxes. Two have been done for you already.

(5)

Cations

Caesium Iron(II) Gallium Lead(IV)

Anions

Nitrate

Oxide FeO PbO2

Sulphate

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(b) Write WORD equations for the following reactions:

(i) Sodium reacts with water forming sodium hydroxide and hydrogen gas.

(1)

………………………………………………………………………………………......

(ii) Barium chloride and sodium sulphate react to form sodium chloride and

barium sulphate.

(1)

………………………………………………………………………………………......

(d) Write BALANCED CHEMICAL equations for the following reactions:

(i) Copper(II) sulphate reacts with barium chloride forming copper(II) chloride

and barium sulphate.

(1)

………………………………………………………………………………………......

(ii) Iron(II) bromide reacts with potassium carbonate forming iron(II) carbonate

and potassium bromide.

(1)

………………………………………………………………………………......................................

(Total 9 marks)

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BIOLOGY SECTION

You are advised not to spend more than 30 minutes on this section

6. The graph shows the size of the pupil in a student’s eye in different light intensities,

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5

4

3

2

1

0 1 2 3 4 5 6

lowlightintensity

highlightintensity

Size ofpupilin mm

(a) Use the graph to answer the questions below.

(i) How many readings were taken to produce the data for the graph?

............……………………………………………………………………… (1)

(ii) What was the size of the pupil at a light intensity of 6?

Answer ………………………. mm (1)

(iii) How does the size of the pupil vary with the light intensity?

............………………………………………………………………………

............……………………………………………………………………… (2)

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(b) Use words from the box to complete the passage.

brain iris muscle optic retina

Light is detected by cells in the ………………………………….... An electrical

impulse is then sent to the ……………………………….. along the

………….…………………….. nerve. Another impulse is then sent to the

………..……………….. tissue of the …………………………………. (5)

(c) The drawing shows a section through an eye.

A

B

C

D

(i) Choose words from the box to label parts A, B, C and D.

cornea iris lens pupil retina

(4) (ii) Which labelled part:

(a) controls the amount of light entering the eye; ..............................................

(b) detects light? ................................................................................................. (2)

(Total 15 marks)

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7. (a) Alex poured some pond water into three beakers. She then put waterweed into each beaker. She put the beakers in different places.

blackbox

beaker Ain normal daylight

beaker Bin the dark

beaker Cin bright light

(i) In which beaker did the waterweed grow best? Give the correct letter.

…………

(1)

(ii) The waterweed in the box changed from dark green to pale yellow. Why did this happen?

……………………………………….……………………………………….

(1)

(b) In the school pond there were lots of water lilies with large leaves covering the surface. There were not many plants growing below the surface. Suggest a reason for this.

……………..……………………………….……………………………………….

……………..……………………………….……………………………………….

(1)

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(c) In another experiment, Alex put similar pieces of waterweed into two more

beakers of pond water. She added fertiliser to one of them. She kept them both by a window.

beaker Dcontaining

waterweed andpond water

beaker Econtaining

waterweed andpond water

plus fertiliser

(i) Alex added fertiliser to beaker E. Suggest the results of this experiment.

……………..……………………………….…………………..…………….

……………..……………………………….…………………..…………….

(1)

(ii) What do fertilisers contain to help plants grow? Tick the correct box.

fat minerals

sand sugar

(1)

(d) The diagrams below show three types of leaf cells.

Label each type of cell in the boxes below.

(3)

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(e) A plant uses its leaves to make food,

Explain how the structure of a leaf helps it to do this.

.......................................................................................................................

.......................................................................................................................

.......................................................................................................................

....................................................................................................................... (3)

(f) During photosynthesis, plants may transport excess sugar out of the leaf or store it in the leaf as starch.

Name the tissue in a plant that transports sugar.

....................................................................................................................... (1)

(g) In an experiment to show that light is needed for photosynthesis, a plant was put in the dark for 48 hours.

(i) What happens to starch stored in leaves when plants are kept in the dark?

..............................................................................................................

.............................................................................................................. (1)

(ii) The plant was then put in bright light for 24 hours. A leaf was removed from the plant and tested for starch.

(a) Name the chemical reagent used to test leaves for starch.

.......................................................................................................

(b) Give the positive results of a starch test.

.......................................................................................................

(c) Give one safety precaution.

.......................................................................................................

(d) Suggest a suitable control for this experiment.

....................................................................................................... (4)

(Total 17 marks)

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8. Fahrid was writing to a pen-friend. This is how he described himself:

I am a boy. I weigh 600 N.

I am 16 years old. I speak French.

I have brown eyes. I have a scar on my chin.

I am 1.8 m tall.

(a) From the list, choose two features which he must have inherited and which will not have been affected by his environment.

1. ..................................................................................................................

2. .................................................................................................................. (2)

(b) From the list, choose two features which will have been affected by both inherited and environmental factors.

1. ..................................................................................................................

2. .................................................................................................................. (2)

(c) Fahrid measured the heights of the 16-year-old pupils at his school. He recorded the distribution in a bar chart.

number of pupils ineach height range

height

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He also collected data about the features in the list below.

Which two features would show a similarly shaped distribution to Gareth’s bar chart?

Tick the two correct boxes.

Ability to roll the tongue.

Presence of ear lobes.

Mass of the pupil.

Circumference of the head.

Sex of the pupil.

(2) (Total 6 marks)

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9. The diagram shows two families. Some of the people in the diagram have freckles.

family A family B

John married to MaryBob married to Emily

Rachel married to Bill Pam married to David

grandparents

parents

children Richard Penny Simon Becca Katie

and

and

key

person withfreckles

person withoutfreckles

(a) (i) Which children are most likely to have freckles? Tick the correct boxes.

Richard Simon Katie Penny Becca

(1)

(ii) How did you decide?

.............................................................................................................

............................................................................................................. (1)

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(iii) Suggest why Bill does not have freckles.

.............................................................................................................

............................................................................................................. (1)

(b) (i) Which two cells pass on information from parents to their children? Tick the two correct boxes.

bone cell cheek cell

egg cell muscle cell

red blood cell sperm cell

(1)

(ii) Which organ system produces these two cells? Tick the correct box.

circulatory system

digestive system

reproductive system

respiratory system

(2)

(c) (i) Draw a Punnet square to show what the offspring would be of two heterozygote

freckled parents. Use the letters F for Freckled and f for non-freckled.

(4)

(ii) Give the phenotypic ratio

………………………………………………………………………………….

(2)

(Total 12 marks)

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PHYSICS SECTION

You are advised not to spend more than 30 minutes on this section

10. James’s coin has rolled under a cupboard. It is dark under the cupboard,

and he cannot see the coin even though the light is on. The diagram shows his problem.

light bulb

cupboardfixed tothe wall

floor coinX

(a) Explain why a shadow forms under the cupboard.

.......................................................................................................................

.......................................................................................................................

(1)

(b) James uses a mirror to shine light from the light bulb onto the coin. He holds the mirror so that it touches the floor at point X.

(i) The symbol for a mirror is

Copy the symbol onto the diagram at point X to show the correct angle for the mirror.

(1)

(ii) On the diagram, draw the ray of light from the bulb to the coin. Draw an arrow on the ray to show which way the light is travelling. Use a ruler.

(2)

(Total 4 marks)

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11. A pupil is observing the behaviour of a woodpecker. He uses a periscope

to look over a wall at a tree, and waits for the bird to land on the trunk.

The pupil can only watch one part of the tree trunk at a time.

(a) Tick the box to show the point on the tree trunk which he can see using the periscope in the position shown

point A

point B

point C

point D

point E

(1)

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(b) Draw the path of the ray of light to show how the pupil sees this

point. Use a ruler. Show the direction of the ray of light.

(3)

(c) What should the pupil do to the periscope to watch point C?

.............................................................................................................

.............................................................................................................

(1)

(Total 5 marks)

12. Light shines onto a ball. Naomi is looking at the ball.

(a) Describe how light from the lamp lights up the ball and makes it visible to Naomi.

.............................................................................................................

.............................................................................................................

(2)

(b) Complete the sentences below.

At a plane mirror, the angle of incidence is …………………………..…

the angle of reflection. The distance from the object to the mirror is

…………………..…. the apparent distance from the mirror to the

image.

(2)

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(c) A beam of white light shines onto a sheet of white paper. An identical

beam of light shines onto a mirror. Describe why the paper appears dull

and the mirror shiny.

paper....................................................................................................

.............................................................................................................

………………………………………………………………………………

mirror....................................................................................................

.............................................................................................................

……………………………………………………………………………….

(4)

(d) Briefly explain the following terms and give an example of each:

Translucent…………………………………………………………………………

Example……………………………………………………………………………..

Opaque………………………………….…………………………………………..

Example……………………………………………………………………………..

(4)

(Total 12 marks)

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13. The lift in a tall building hangs from a strong cable. The movement of the lift is affected by only two forces. These forces are the tension in the cable and the weight of the lift.

weight

cabletension

lift

(a) The lift is not moving. How do the sizes of the two forces compare?

Tick the correct box.

The tension is greater than the weight.

The tension equals the weight.

The tension is less than the weight.

It is impossible to know which is greater.

(1)

(b) When the lift is moving upwards and its speed is increasing, how do the sizes of the two forces compare?

.............................................................................................................

(1)

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(c) When the lift is moving upwards at a constant speed, how do the sizes of the two forces compare?

.............................................................................................................

(1)

(d) Near the top of the building the lift is moving upwards, but slowing down. How do the sizes of the two forces now compare?

.............................................................................................................

(1)

(Total 4 marks)

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14. In an experiment, a spring was used to see how forces can cause materials

to stretch. The extension of the spring was measured for different forces acting

on it. The following measurements were taken and recorded in the table below.

Calculate the average spring constant from the table. Show ALL your workings.

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

(2)

(a) Plot a graph of extension (y-axis) against force (x-axis) and show how you

can find the spring constant from your graph.

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…………………………………………………………………………………………………

…………………………………………………………………………………………………

…………………………………………………………………………………………………

(8)

(b) State Hooke’s law

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

(1)

(Total 11 marks)

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15. If the distance travelled during the accelerating period is given by the formula:

D=1/2 . (i+f) . T

Where:

D = distance travelled

i= initial velocity

f = final velocity

T = time taken

(a) How far will the car travel during this time?

………………………………………………………………………………………………

………………………………………………………………………………………………

………………………………………………………………………………………………

(2)

(b) In an experiment a trolley was used to show how acceleration changes with

force. A diagram of the apparatus is shown below:

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(i) Two light gates (which measure velocity) are used. Explain why it doesn’t

matter which reading one takes.

……………………………………………………………………………………………

……………………………………………………………………………………………

(1)

(ii) The following data is presented to you. The data is taken for the trolley

reaching the first light gate.

Fill in the table below. Show ALL your working in the space provided underneath

along with any formulae you might have used and any assumptions you might

have made.

Varying mass

(g)

Weight

(N)

Final Velocity

(m/s)

Time taken

(s)

Acceleration

(m/s2)

30 0.420 2.67

40 0.536 1.93

50 0.630 1.72

60 0.691 1.53

70 0.765 1.40

80 0.857 1.36

……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

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……………………………………………………………………………………………

……………………………………………………………………………………………

……………………………………………………………………………………………

(6)

(iii) Plot a graph of acceleration (y-axis) against accelerating force (x-axis)

and show how you can find the mass of the trolley from your graph. Show ALL

your working and formulae.

(6)

Mass of trolley…………………………………………………………………………….

(2)

(Total 14 marks)