pecutan akhir kimia 2015 esei & kbat smtjb

7/25/2019 Pecutan Akhir Kimia 2015 Esei & KBAT SMTJB

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BENGKEL PECUTAN AKHIR

Nama : . Ting

: 5

QUESTION 1

Table 7.1 shows the electron arrangement of elements T, U, V, W and X.Jadual 7.1 menunjukkan susunan elektron bagi unsur T, U, V,W danX.

ElementUnsur

Electron arrangementSusunan elektron

T .1U .7

V .!.1W .!.7

X .!.!

Table 7.1"Jadual7.1

#a$ %om&are the atomic si'e between atom of element T and V. ()&lain *o+r

answer.Bandingkan saiz atom di antara atom unsurT danatom unsur V. Terangkan jawapan anda.

marks-

#b$ %om&are the atomic si'e between atom of element V and W. ()&lain *o+r

answer.

Bandingkan saiz atom di antara atom unsur V danatom unsur W. Terangkan jawapan anda. marks-

#c$ Which element is chemicall* +nreacti/e0 ()&lain *o+r answer.Unsur manakah yang tidak reaktif secara kimia? Terangkan jawapan anda.

marks-

#d$ %om&are the reacti/it* of element T and V. ()&lain *o+r answer.Bandingkan kereaktifan unsur Tdan V. Terangkan jawapan anda.

marks-

#e$ %om&are the reacti/it* of element U and W. ()&lain *o+r answer.Bandingkan kereaktifan unsur Udan W. Terangkan jawapan anda.

marks-

1


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QUESTION 2

2iagram 7. shows the electron arrangement diagrams for magnesi+m o)ide andcarbon dio)ide.

ajah !." menunjukkan gambarajah susunan elektron bagi magnesium oksida dan karbon dioksida.

3agnesi+m o)ide " magnesium oksida carbon dio)ide " karbon dioksida

2iagram 7. " 4aah 7.

#a$ 6ased on diagram 7., state the t*&e of bond and e)&lain the formation of

bond in both com&o+nds.Berdasarkan rajah !.", nyatakan jenis ikatan dan terangkan pembentukan ikatan bagi kedua#

dua sebatian.

mar8s-

#b$ %om&are the two com&o+nds and e)&lain in terms of :9Banding kedua#dua sebatian tersebut dan terang berdasarkan$#

#i$ 3elting &oint and boiling &ointTakat lebur dan takat didih

#ii$ (lectrical cond+cti/it*%ekonduksian elektrik

mar8s-


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QUESTION 3

Table 1.1 shows two sets of e)&eriments to determine the &osition of metal 3,

metal N and carbon in the 4eacti/it* ;eries.Jadual &'.& menunjukkan dua set eksperimen bagi menentukan kedudukan logam (, logam ) dankarbon dalam *iri %ereaktifan.

6ased on the obser/ations in Table 1.1 arrange metal 3, metal N and carbon inascending order based on their reacti/it*.()&lain *o+r answer and s+ggest metal 3 and metal N.Berdasarkan pemerhatian dalam Jadual &'.& susun logam (, logam ) dan karbon mengikut tertibmenaik berdasarkan kereaktifannya.Terangkan jawapan anda dan cadangkan logam ( dan logam ).

mar8s-


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QUESTION

2iagram 1. shows the a&&arat+s set9+& of an e)&eriment to in/estigate the

transfer of electrons at a distance.

ajah &'." menunjukkan susunan radas eksperimen untuk mengkaji pemindahan elektron padasuatu jarak

6* refering to the set +& of the a&&arat+s , describe the method to carr* o+t the

e)&eriment. e?+ations.

+engan merujuk kepada susunan radas di atas, huraikan kaedah untuk menjalankan eksperimen ini.

(asukkan dalam huraian anda , $

nama bahan yang sesuai untuk digunakan sebagai agen pengoksidaan dan agen penurunan,

langkah#langkah

pemerhatian eksperimen

Ujian pengesahan hasil tindak balas

setengah persamaan pengoksidaan dan setengah persamaan penurunan.

1 mar8s-


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QUESTION !

Table @ shows a list of a&&arat+s and materials.Jadual menunjukkan senarai radas dan bahan.

A&&arat+s and materials:adas dan bahan$

%arbon electrodes-lektrod#elektrod karbon

%onnecting wiresayar penyambung

Bal/anometer /al0anometer

U9t+be

Tiub# U

6romin water 1ir bromin 2il+te s+l&h+ric acid 1sid sulfurik cair

A red+cing agent*uatu agen penurunan

Table @ " Jadual

2raw one labelled diagram to show the a&&arat+s set9+& to in/estigate electron

transfer at a distance b* +sing the a&&arat+s and materials gi/en in Table @.

Name the red+cing agent.

2escribe the redo) reaction in terms of the electron transfer at a distance.

2ukiskan satu rajah berlabel bagi menunjukkan susunan radas untuk menyiasat pemindahan elektron

pada satu jarak dengan menggunakan radas dan bahan yang terdapat dalam Jadual .

)amakan agen penurunan tersebut.

3uraikan tindak balas redoks dari segi pemindahan elektron pada satu jarak.

@ mar8s-

QUESTION "

5


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2iagram 1. shows an a&&arat+s set +& to in/estigate the eCect of two diCerentmetals 3 and N on the r+sting of iron.ajah &'.4 menunjuklcan susunan radas bagi mengkaji kesan dua logam berbeza ( dan ) ke ataspengaratan besi.

2iagram 1. " ajah &'.4

The res+lt of this e)&eriment after a few da*s is shown in Table 1.%eputusan eksperimen selepas beberapa hari adalah seperti dalam Jadual &'.

Dair of metals

5asangan logam

Ebser/ation

5emerhatian

Fe, 36l+e s&otsTompok biru

Fe, NNo change

Tiada perubahan

Table 1 "Jadual l'

6ased on Table 1, s+ggest the names of metal 3 and N. ()&lain wh* there is adiCerence in the obser/ations in both test t+bes.

Berdasarkan Jadual &', cadangkan nama logam ( dan ). Terangkan mengapa terdapat perbezaanpemerhatian dalam kedua#dua tabung uji tersebut.

! 3ar8s-

QUESTION #


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#a$


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A gro+& of st+dents carried o+t three e)&eriments to in/estigate the factorsaCecting the rate of reaction between h*drochloric acid and 'inc.

Table !.1 shows the res+lts of the e)&eriments.

*ekumpulan pelajar membuat eksperimen bagi mengkaji faktor#faktor yang mempengaruhi kadartindakbalas antara asid hidroklorik dan zink.

Jadual 9.& menunjukkan keputusan eksperimen tersebut.

E+,er%ment

E-',er%men

Reactant'Bahan tindak balas

T%me ta-en to collect. cm3o& /0rogen

ga' 'Masa yang diambil untuk

mengumpul 40 cm3gas

hidrogen (s)

I

5 cmof 1. mol dm9h*drochloric acidI 'inc gran+le I a few dro&s of

co&&er#


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Table 1 shows the res+lts of three sets of e)&eriments to in/estigate the factorsthat aCect the rate of reaction. 5 cmof carbon dio)ide gas is collected in eache)&eriment.Jadual 1 menunjukkan keputusan bagi tiga set eksperimen untuk menyiasat faktor yangmempengaruhi kadar tindakbalas.:' cm"gas karbon dioksidadikumpulkan dalam setiap eksperimen.

(8s&eriment

-ksperimen

4eactantsBahan tindak balas

Tem&erat+re " o%

*uhu o%

Time ta8en to collectsgas"s

(asa yang diambil untukmengumpulkangas "s

3agnesi+m o)ide is not strong"&ermeable"easil* &eeled oC.

QUESTION 22 KBAT

1. Water is &resent in X b+t there is no water in in G.. %itric acid ionises in water

1


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. HIion &resent. HIion reacts with sodi+m carbonate " bicarbonate to release b+bbles of carbon

dio)ide5. Witho+t water citric acid e)ists as molec+le "" witho+t water HIis not &resent. When HI ion is not &resent, citric acid cannot reacts with sodi+m carbonate "

bicarbonate

QUESTION 23 KBAT

1. Bas G is ;+l&h+r dio)ide. The soil is acidic d+e to acid rain. Add calci+m carbonate " calci+m o)ide which is al8aline that can ne+tralise the

acid in the soil.

QUESTION 2 KBAT

;*nthetic &ol*mers ca+se en/ironmental &oll+tion1.


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. Fre?+enc* of eCecti/e collision between anti9acid"al+mini+mh*dro)ide"magnesi+m h*dro)ide and stomach acid " gastric acid " h*drogenion higher.

. The rate of reaction becomes higher."" The indigestion can be c+red faster.""The ne+trali'ation occ+rred faster.

QUESTION 2$ KBAT

(a) 1. The sea breeze contains salts which increase the electrical conductivity of water.2. This makes the water a better electrolyte and therefore speeds up the rusting /

corrosion of the iron padlock.

(b) 1. ttach the iron padlock to a more electropositive metal which acts as the sacrificialmetal.

2. !oat / "alvanise the iron padlock with a thin layer of zinc.#. !oat the iron padlock with a thin layer of tin // Tin plating

$. %lectroplate the iron padlock with rust& resistant metals such as chromium / nickel //lloying

'. aint the iron padlock

pecutan akhir kimia 2015 esei & kbat smtjb

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