7/26/2019 Chemistry Form 5 Done

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Prepared by : Mr. Ben Tee

HOLIDAY HOMEWORKS ( Week 11 )

Name : _______________________ Class : ________ Subjec : CHEMIS!RY

1 SPM 2007/P2/Q6Iron is a metal that rusts easily.(a) (i) State the conditions for the rusting of iron.

[1mark]

(ii) Draw a labelled diagram to show how the conditions for the rusting of iron

involve in the ioniation of iron and the flow of electron. [! mar"s](b) (i) Describe the reactions that ta"e #lace at the edge of water dro#let (#ositiveterminal) during the rusting of iron after the $e

%&and '

ions are formed.

[! marks]

(ii) State the change in the o*idation number of iron in +(b)(i).

[ 1 mark]

(c) Diagram + shows the use of inc #lates on an iron shi# to #revent rusting.

Diagram 6(i) ,*#lain how the inc #lates #rotect the iron shi# from rusting.

[% marks]

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(ii) -rite the half euation for the rection in +(c)(i).

[1 mark]

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2. SPM/2004/P3/Q2

$igure %.1 shows the setu# of a##aratus for an e*#eriment to determine the order of metalsin the /eactivity Series.

0otassium manganate(II) is heated to release o*ygen gas to react with metal #owder.

Figure 2.12he e*#eriment is carried out using metal #owders of co##er3 inc3 magnesium and leadreacted with o*ygen res#ectively.'bservations on the metal #owders of co##er3 inc3 magnesium and lead in thee*#eriments are shown in $igure %.%

4etals are arranged in the /eactivity Series based on the reactivity of metal with o*ygen.

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Figure 2.2

(a) 5oo" at the flame or glow in each diagram in $igure %.%. 6om#lete $igure %.% bystating the observations for the reaction of metal #owders with o*ygen.

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(b) 6om#lete 2able %.! based on the e*#eriment.

Name of variables Action to be taken

(i) 4ani#ulated variable7

...........

(i) 2he way to mani#ulatevariable7

..

..

...

(ii) /es#onding variable7

.

(ii) -hat to observe in theres#onding variable7

...

...

...(iii) 6ontrolled variable7

.

(iii) 2he way to maintain thecontrolled variable7

...

Table 2.3

(c) State one hy#othesis for the e*#eriment.

..

..[3 marks]

(d) (i) 8ased on the observations in $igure %.%3 arrange co##er3 inc3magnesium and lead in descending order of reactivity of metal towardso*ygen.

Descending order of reactivity of metal towards o*ygen.

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(ii) 2he e*#eriment is re#eated by using aluminium #owder to react witho*ygen. 2he result of the e*#eriment is shown in $igure %.9.

Set-up of apparatus bservation on t!e metal

4oderately bright flame

Figure2."

0redict the #ositions of aluminium in the /eactivity Series of metals in(d)(i). Draw an arrow ( : ) in (d)(i) to show the #osition of aluminium inthis reactivity series.

[3 marks]

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Figure 2.#

8ased on the observations in $igure %.;3 classify the metals into two grou#s3 those

which are more reactive than carbon and those which are less reactive than carbon.0ut your answer in a suitable table.

[! marks]