2020_Combined science_olevel_mj_paper3

Extracted Content: 2020_Combined science_olevel_mj_paper3

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TE zinisec 14 Fur Pesformaiice Memurenent i

IBABWE SCHOOL EXAMINATIONS CO

General Certificate of Education Ordinary Level

COMBINED SCIENCE 4003/3

PAPER 3 (Practical Test)

JUNE 2020 SESSION 1 hour 30 minutes
Candidates answer on the question paper
Additional materials:

As listed in instructions to Supervisors
Calculator (optional)

INSTRUCTIONS TO CANDIDATES

Write your name, centre number and candidate number in the spaces at the top of this page.

Answer both questions.
Write your answers in the spaces provided on the question paper.
Use a sharp pencil for your drawings. Coloured pencils or crayons should not be used.

You should record all experimental results and show the essential steps in any calculation
in the spaces provided in the question paper.

FOR EXAMINER USE

INFORMATION FOR CANDIDATES |
1

The number of marks is given in brackets [ ] at the end of | |

each question or part question. 2 |
TOTAL |

paper consists of 5 printed pages and 3 blank pages.

This question ‘
it Zimbabwe School Examinations Council, J2020.

Copyright:

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Measure the initial temperature of the hydrochloric acid and record it in Table

Rinse the thermometer and the measuring cylinder thoroughly with water,
Measure 25.0 aa of the sodium hydroxide solution.

Measure the initial temperature of the sodium hydroxide solution and record it in Table 1.1,

Calculate the average temperature of the dilute hydrochloric acid and the sodium hydroxide
solution and record it in Table 1.1,

NB: The average temperature of reactants

= initial temperature of HC/ + initial temperature of NaOH
2

a
Pour the 25.0 cm of the sodium hydroxide solution from the measuring cylinder into the
dilute hydrochloric acid in the plastic cup.

Gently stir the mixture with the thermometer.
Measure the temperature of the mixture and record it in Table 1.1.

Table 1.1

temperature/ "¢

initial temperature of the hydrochloric acid, HC/

initial temperature of the sodium hydroxide solution, NaOH

average temperature of the reactants

temperature of mixture

temperature change

4003/3 J2020

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(c)

supported

Gi) State the products of the reaction that occurred in the plastic cup.

[2]

(00) State, giving a reason, one precaution which is to be taken during the
experiment.

Gi)

(iii)

(1)

4003/3 12020

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(a)

@

Fig.2.1
Measure, and record in Table 2.1, the length and width of face A.
Measure, and record in Table 2.1, the length and width of face B.

Convert the measurements of length and width to metres, recording them in
Table 2.1.

Calculate the area of each face and record it in Table 2.1.

Table 2.1
: length . 2 G
brick face jem length/m | width/em width/m area/m
A
|

4003/3 J2020

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(iii) Calculate the pressure exerted on the table by

1. face A,

[4]
Deduce a relationship between surface area and pressure from the calculations

[1]

State and explain the effect, on pressure, of using a brick of mass 6.20 kg but
which has the same length, width and height as the brick used in this

experiment.
CLEC CE a nsssserssnsenneetters ssussesssceasessseneeseeeseseneensncnvnauanennsanenens

of error which may be encountered in the exp

State one source

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