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Bgcse SDA Paper 4 2019 - Revised

Bachelor of sciences General (University of Botswana)

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BOTSWANA EXAMINATTONS COUNCIL

Botswana General Certificate of Secondary Education

CANDIDATE
NAME

CENTRE CANDIDATE
NUMBER NUMBER

SCIENCE: DOUBLE AWARD 0569/04

Paper 4 October/November 2019
't hour 30 minutes
Candidates answer on the Question Paper.
(r)
o Additional Materials: 300 mm ruler.
(o

READ THESE INSTRUCTIONS FIRST

Write your candidate name, Centre number and candidate number in the spaces provided at the top of this
page.
Write in dark blue or black pen.
You may use a soft pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, highlighters, glue or correction fluid.
DO NOTWRITE IN ANY BARCODES.

Answer all questions.

Write your answers in the spaces provided on the Question Paper.
The number of marks is given in brackets [ ] at the end of each question or part question.
You may lose marks if you do not show your working or if you do not use appropriate units.
You may use a calculator.

A copy of the Periodic Table is printed on page 16.

o For Examiner's Use

Total

This document consists of 15 printed pages and 1 blank pages.

[Turn over
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For
2
Examiner's
Use
An experiment is performed to determine the acceleration of free fall g using a simple
pendulum.

Fig. 1 .1 shows a set-up when measuring length I of the pendulum.

'm
\./ r,'\ \\-'
i-0.6
l

wooden clamp
#-
;-o'
[*ot
r." 09
It*
F* 1.0

c)
i- 1.1
o
(f)

1.2

1.3

Fig. 1.1

Some of the results of the experiment are shown in Table 1.1.

Table 1.1

llm time for 10 swings/s Tis T2ls2

0.00 0.00 0.00 0.00

o 0.10 6.30 0.63 0.40

14.20 1.42 2.02

1.00 20.00 2.00 4.00

1.50 2.46 6.06

2.OO 28.40 2.84 8.07

(a) ti) Record the length I of the pendulum shown on Fig. 1.1 in Table 1.1, when the time
for 10 swings is 14.20s. t1l

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For
3
Examiner's
Use
( ii) Suggest a reason why the length I of the pendulum is measured from the lower part
of the wooden clamp as shown in Fig. 1.1.

.. ... ... t1l

(iii) Explain why the time is measured for 10 swings instead of 1 swing.

t1l

(b) Fig. 1 .2 shows the time for 10 swings when the length I of the pendulum is 1 .50 m.

(f)
o
a)

Fig. 1.2

Record the time shown by the stopwatch for the length of 1.50m in Table 1.1. t1l

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For
4 Examiner's
Use
(c) (i) Plot a graph of T2 (y-axis) against I (x-axis). l4l

;.

ll
il

:]
r,
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I1
11 iii
:1 i;t

ii
I t t1
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t
4..

;i,
:::

X';,*eiJ
,iK;:

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For
5
Examinefs
Us€
(ii) Determine the gradient G of the graph.

(iii) Calculate g using the equation

39.48
J
(J

tr)
o
o,

g= t1I

student investigates whether the mass of the bob affects the period of a pendulum.
A stu
The sstudent has 5 bobs of different masses.

State two variables that should be kept constant in this investigation.

1.....

o tzt

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For
6
Examinefs
Use
2 (a) A student is provided with alcohol, oil, two identical test tubes, a ruler and a water bath.
Describe an experiment the student can carry out to compare the thermal expansions
of the alcohol and the oil. You may draw a diagram.

(r)
o
CD

........141

(b) Give a reason for using a water bath.

o

.... .... t1l

(c) Suggest what change in the apparatus used would improve this experiment and give a
reason.

suggestion

reason

l2l
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7 For
Examiner's
Use
An experiment is performed to investigate the percentage of water of crystallisation in
hydrated copper(Il) sulphate crystals. The crystals are placed in a crucible, weighed,
heated and weighed again.

Fig. 3.1(a), Fig. 3.1 (b) and Fig. 3.1 (c) show the scale readings when measuring the mass
of the crucible, the mass of the crucible and hydrated copper(Il) sulphate and the mass of
the crucible and anhydrous copper(II) sulphate, respectively.

(a) Record the scale readings in the spaces provided.

14.0 15.0 s

(,
o
(f)
Fig. 3.1(a)

mass of crucible =

26.0 27.0 g

Fis.3.1(b)

mass of crucible and hydrated copper(Il) sulphate =

o
22.0 23.0 g

Fig. 3.1(c)

mass of crucible and anhydrous copper(Il) sulphate =

121

(b) Calculate

(i) the mass of hydrated copper(Il) sulphate,

mass of hydrated copper(Il) sulphate = t1l

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For
Etarn ?er's
i
{rse
I

(ii) the massof the water lost,

(iiil the p.eroentage of watar of erystallisation in the oampla

perpentage = nl
(c) Draw and labelthe set-up thatcould b,e used when heating the hydrated copper(Il)
H sulphate crystats.

azt

(dl The hydrated copper(Il) sulphate crystals contain bariurn sulphate impurities.

E Suggest how pure crystals of eopper(Il) sulphate could be obtained.

e

t4l

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9 For
Examiner's

4 Some tests are carried out on metal X. Use

Table 4.1 shows some tests, observations and conclusions.

Complete Table 4.1.

Table 4.1

tests observations conclusions

(a) MetalX is added to dilute

hydrochloric acid in a test
tube. t1I

The gas produced is

tested with

pop sound produced

(9
(f
CD I,1 I r,{ I
t,J

The solution is divided

into three portions.

(bxi) To the first portion, a few

drops of sodium
hydroxide solution are t21
added. Zn2* lAl3* ions
suspected.
( ii) Excess sodium hydroxide
solution is added.

r1l

(cXi) To the second portion,

o

111 141
t'J
is added,

( ii) then, the substance in

(c)(i) is added in excess.

tll Zn2* ions confirmed.

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For
10
Examiner's
Use
Fig. 5.1(a) shows a photograph of a cross-section of a pomegranate.

Fig. 5.1(b) shows a photograph of a cross-section of a squash.

(9
o
(f) Fig. 5.1(a) Fig. s.1{b}

(a) Make a large drawing of the pomegranate in Fig. 5.1(a).

t4l

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11 For
Examiner's
Use
(b) (i) Draw corresponding lines on Fig. 5.1(a) and your drawing to show the longest
diameter of the pomegranate. t1I

I
( ii) Measure and record:
o the length of the longest diameter of the photograph of the pomegranate in
I Fig 5.1(a).
t
.
t the length of the same diameter of the pomegranate in your drawing.

!u length of longest diameter of photograph =

i

length of longest diameter of drawing =

t1I

(iii) Calculate the magnification of your drawing. Use the equation

length of longest dianeter of draw ing

(r)
o magnification =
cf) length of longest diarreter of the photograph

magnification = I1l

(c) State two visible differences between the pomegranate in Fig. 5.1(a) and the squash
in Fig. 5.1(b).

o t21

(d) A student wanted to test the squash for fats.

(i) State the name of the reagent the student should use.

..... . t11

(ii) State the result of a positive test for fats.

.. . .. .11I

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12

6 A potato is cut into cylinders as shown in Fig. 6.1.

\f*

qF
:
potato cylinder
potato

Fig. 6.1

The potato cylinders are placed in salt solutions of different concentrations.

Table 6.1 shows the percentage change in length of the potato cylinders.
CO

(r)
Table 6.1

concentration of salt solution / mol perdm3 percentage change in length

0.0 10

0.2 4

4.4 -4
E
0.6
E
0.8

(a) Suggest why the percentage change in length remains constant when the concentration
increases from 0.6moli dms to 0.8mol/dm3.

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For
13
Examiner's
Use
(b) The graph shows the percentage change in length of the potato cylinders.
Only two points have been plotted on the graph.

On the grid provided, plot the other three points and draw a best fit line. l2l
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o concentration of salt solution i mol perdms

(c) (i) From the graph, determine the concentration of the cell sap of the potato.

concentration = ......... ...... mol/dm3 [1]

I

i
(ii) Explain your answer in (c)(i).

t1l

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14

(d) The potato cylinder that was placed in a salt solution of concentration of 0.2 mol/dm3
had an initial length of 5.0cm.

Calculate the final length of the potato cylinder. Use the equation

finallength - initial length _ percentage change in length

initial length 100

Show your working.

final length =
(r)
o
(f)

(e) A student is provided with two potatoes.

Suggest an experiment that can be perfonned to compare the cell sap concentration
of the two potatoes.

Permission to reproduce items where third party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable
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