Cambridge International Examinations Cambridge International General ...

Cambridge International Examinations

Cambridge International General Certificate of Secondary Education

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COMBINED SCIENCE

0653/03

Paper 3 Theory (Core)

For Examination from 2019

SPECIMEN PAPER

1 hour 15 minutes

Candidates answer on the Question Paper.

No Additional Materials are required.

READ THESE INSTRUCTIONS FIRST

Write your Centre number, candidate number and name on all the work you hand in.

Write in dark blue or black pen.

You may use an HB pencil for any diagrams or graphs.

Do not use staples, paper clips, glue or correction fluid.

DO NOT WRITE IN ANY BARCODES.

Answer all questions.

Electronic calculators may be used.

You may lose marks if you do not show your working or if you do not use appropriate units.

A copy of the Periodic Table is printed on page 20.

At the end of the examination, fasten all your work securely together.

The number of marks is given in brackets [ ] at the end of each question or part question.

This document consists of 20 printed pages.

? UCLES 2016

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1

(a)

Fig. 1.1 is a diagram of the internal structure of the heart.

D

A

C

B

wall of left ventricle

Fig. 1.1

(i)

Use the following words or phrases to name structures B and C.

aorta

pulmonary artery

right ventricle

coronary artery

pulmonary vein

septum

one-way valve

right atrium

vena cava

B ........................................................................................................................................

C ........................................................................................................................................

[2]

(ii)

On Fig. 1.1, draw two arrows to show

1. the direction of blood flow through A,

2. the direction of blood flow through D.

[2]

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(b) (i)

Table 1.1 shows diagrams of some blood cells.

Complete the table.

Table 1.1

diagram

name of cells

function of cells

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

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

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

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

X

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

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

[4]

(ii)

Describe the function of structure X in the cell shown in Table 1.1.

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

...................................................................................................................................... [1]

[Total: 9]

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2

(a) An atom of carbon has a proton (atomic) number of 6 and a nucleon (mass) number of 12.

(i)

Complete Table 2.1 to show the structure of this carbon atom.

Table 2.1

in nucleus

outside nucleus

6

0

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

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

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

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

number of protons

number of neutrons

number of electrons

[2]

(ii)

The protons in a carbon atom have a positive charge.

Explain why a carbon atom has no overall charge.

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

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

...................................................................................................................................... [2]

(b) Methane is a hydrocarbon and the main constituent of natural gas.

(i)

Natural gas is a fossil fuel.

Name two other fossil fuels.

............................................................... and ............................................................... [1]

(ii)

Write a word equation for the complete combustion of methane.

+

+

[2]

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(c) Fig. 2.1 shows the structure of a molecule of methane.

chemical bond

H

H

C

H

H

Fig. 2.1

(i)

State the formula of methane.

........................................................... [1]

(ii)

Name the type of chemical bond in a methane molecule.

...................................................................................................................................... [1]

(iii)

State the number of electrons in the chemical bond shown in Fig. 2.1.

...................................................................................................................................... [1]

[Total: 10]

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