CIE iGCSE Co-Ordinated Science C1.1 Solids, liquids and gases Exam Style Questions Paper 3
Question
(a) Copper is a metal in high demand that is now often recycled.
To recycle copper, it must be melted down into a liquid.
(i) Suggest one reason other than cost why copper and other metals are recycled.
(ii) Describe two differences between the arrangement and motion of atoms in molten
copper and the arrangement and motion of atoms in solid copper.
(b) A metal coin is covered with a layer of copper by electroplating.
(i) The coin is used as one of the electrodes.
State for which electrode the coin is used.
(ii) Suggest a suitable solution to be used as the electrolyte for electroplating the coin.
(iii) Electroplating uses the process of electrolysis; a definition is provided.
Electrolysis is the breakdown of a covalent compound when solid or in aqueous solution by the passage of electricity.
This definition of electrolysis is not correct.
Circle the two words in the definition that are not correct.
▶️Answer/Explanation
Ans : 8(a)(i) copper (ore) is a finite resource ;
8(a)(ii) arrangement – solid regular and liquid irregular ;
motion – solid vibrate (about fixed point) only / do not move AND liquid are able to move about ;
8(b)(i) cathode ;
8(b)(ii) copper sulfate / copper chloride ;
8(b)(iii) covalent ;
solid ;
Question
(a) A sample of clean air contains nitrogen and other gases.
State the percentage of nitrogen in the sample of clean air.
(b) Argon is one of the other gases found in clean air.
Fig. 5.1 shows the electronic structure of an atom of argon.
(i) Use Fig. 5.1 to explain why argon is unreactive.
(ii) State one use for argon gas.
(c) Sulfur dioxide is a pollutant in the air.
(i) State one source of sulfur dioxide.
(ii) Name one other oxide that is a pollutant in the air.
(d) Sulfur dioxide contributes to acid rain.
(i) Acid rain reacts slowly with limestone.
Suggest one reason for this slow rate of reaction.
(ii) Acid rain also causes acidic soil.
Name the chemical substance used by farmers to treat acidic soil.
(iii) State the name of the type of reaction that occurs when the substance you have named
in (d)(ii) is added to acidic soil.
(e) Scientists are concerned about the increase in the amount of greenhouse gases in the Earth’s
atmosphere.
Name one greenhouse gas.
▶Answer/Explanation
Ans: 5(a) nitrogen 78% ;
5(b)(i) full outer shell /
no need to gain or lose electrons ;
5(b)(ii) lamps ;
5(c)(i) combustion of fossil fuels ;
5(c)(ii) oxides of nitrogen / carbon monoxide ;
5(d)(i) acid rain is (very) dilute ;
5(d)(ii) limestone / calcium carbonate ;
5(d)(iii) neutralisation ;
5(e) carbon dioxide / methane ;
Question
(a) Table 8.1 gives statements about molecules in solids and gases.
Put a tick (✓) next to each statement to show if it refers to a solid or to a gas.
(b) Use the list of substances to answer the following questions.
Each substance may be used once, more than once or not at all.
(i) Identify one substance which is a compound.
…………………………………………………………………………………………………………………….
(ii) Identify two substances which are solvents.
1 ………………………………………………………………………………………………………………….
2 …………………………………………………………………………………………………………………
(iii) Identify one substance which is a transition element.
………………………………………………………………………………………………………………….
(iv) Identify one substance which is a halogen.
…………………………………………………………………………………………………………………..
(v) Identify one substance which consists of diatomic molecules.
…………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………
▶️Answer/Explanation
Ans: 8(a)
2 or 3 correct ;
4 correct ;
8(b)(i) ethanol / water ;
8(b)(ii) ethanol ;
water ;
8(b)(iii) copper ;
8(b)(iv) chlorine ;
8(b)(v) chlorine / oxygen ;