CIE iGCSE Co-Ordinated Science C9.5 Corrosion of metals Exam Style Questions Paper 3
Question
(a) (i) An iron nail rusts when it is exposed to damp air.
Rusting involves the oxidation of iron.
State what is meant by the term oxidation.
(ii) Describe one method used to prevent the iron nail from rusting.
Explain how this method prevents the iron nail from rusting.
method …………………………………………………………………………
explanation …………………………………………………………………………
(b) Complete the sentence.
Metal ores are a finite resource and therefore, metals need to be ……………………………… .
(c) Iron is a transition element.
Put a tick (3) in the boxes next to all the correct statements about iron.
(d) Steel is an alloy of iron.
(i) Suggest why steel is used for making cars instead of pure iron.
(ii) Table 2.1 shows the percentage composition of stainless steel.
Calculate the mass of iron contained in 80 kg of stainless steel.
mass of iron = ……………………………………………. kg
(e) Iron is malleable.
State the meaning of malleable.
▶️Answer/Explanation
Ans : 2(a)(i) gain of oxygen ;
2(a)(ii) paint it ;
stops contact with air and water ; etc.
2(b) recycled ; OWTTE
2(c) iron acts as a catalyst ;
iron forms coloured compounds ;
2(d)(i) stronger ;
2(d)(ii) iron % 65 ;
80 × 65 / 100 = 52 (kg) ;
2(e) can be shaped or bent ;