LIBS TASK OIGSCI 03 0620 12 2021 - GCE Guide

*8684920146*

Cambridge IGCSETM

CHEMISTRY Paper 1 Multiple Choice (Core)

0620/12 February/March 2021

45 minutes

You must answer on the multiple choice answer sheet.

You will need: Multiple choice answer sheet Soft clean eraser Soft pencil (type B or HB is recommended)

INSTRUCTIONS There are forty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct

and record your choice in soft pencil on the multiple choice answer sheet.

Follow the instructions on the multiple choice answer sheet. Write in soft pencil. Write your name, centre number and candidate number on the multiple choice answer sheet in the

spaces provided unless this has been done for you.

Do not use correction fluid. Do not write on any bar codes. You may use a calculator.

INFORMATION The total mark for this paper is 40. Each correct answer will score one mark. Any rough working should be done on this question paper. The Periodic Table is printed in the question paper.

This document has 16 pages. Any blank pages are indicated.

IB21 03_0620_12/4RP ? UCLES 2021

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1 In which changes do the particles move further apart?

W

X

gas

liquid

solid

Y

Z

A W and X

B W and Z

C X and Y

D Y and Z

2 Gases are separated from liquid air by fractional distillation. The boiling points of four gases are shown. Which gas is both monoatomic and a liquid at ?200 C?

gas

boiling point / C

A

argon

?186

B helium

?269

C

neon

?246

D nitrogen

?196

3 Impurities change the melting and boiling points of substances.

Sodium chloride is added to a sample of pure water.

How does the addition of sodium chloride affect the melting point and the boiling point of the water?

melting point boiling point

A increases

increases

B decreases

decreases

C increases D decreases

decreases increases

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3 4 The apparatus used to separate a mixture of sand, methanol and ethanol is shown.

S R P

Q Which row identifies the labels on the diagrams?

P

A

filtrate

B

filtrate

C

residue

D

residue

Q residue residue filtrate filtrate

R condenser fractionating column condenser fractionating column

S fractionating column

condenser fractionating column

condenser

5 A neutral atom, J, contains 45 neutrons and 35 electrons. Which row is correct for atom J?

proton number nucleon number

A

35

45

B

35

80

C

45

45

D

45

80

6 Lithium and fluorine react to form lithium fluoride.

A student writes three statements about the reaction.

1 Lithium atoms lose an electron when they react. 2 Each fluoride ion has one more electron than a fluorine atom. 3 Lithium fluoride is a mixture of elements.

Which statements are correct? A 1 and 2 only B 1 and 3 only

C 2 and 3 only

D 1, 2 and 3

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7 Which definition of isotopes is correct?

A atoms of the same element that have the same number of electrons and nucleons B atoms of the same element that have the same number of neutrons and protons C atoms of the same element that have the same number of protons but a different number of

electrons D atoms of the same element that have the same number of protons but a different number of

nucleons

8 In which molecule are all the outer shell electrons from each atom used to form covalent bonds?

A CH4

B Cl 2

C H2O

D NH3

9 What is the balanced chemical equation for the reaction between calcium and water? A Ca + H2O CaOH + H2 B Ca + H2O Ca(OH)2 + H2 C Ca + 2H2O CaOH + H2 D Ca + 2H2O Ca(OH)2 + H2

10 A compound has the formula XF2 and has a relative mass of 70. What is element X? A gallium B germanium C sulfur D ytterbium

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5 11 The diagram shows a section of an overhead power cable.

steel

ceramic

aluminium

Which statement explains why a particular substance is used? A Aluminium has a low density and is a good conductor of electricity. B Ceramic is a good conductor of electricity. C Steel can rust in damp air. D Steel is more dense than aluminium.

12 Three substances are electrolysed using inert electrodes.

Which substances produce hydrogen at the negative electrode?

1 concentrated hydrochloric acid 2 concentrated aqueous sodium chloride 3 dilute sulfuric acid

A 1, 2 and 3

B 1 and 2 only C 1 and 3 only D 2 and 3 only

? UCLES 2021

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