concentration of ions dilute chloride solution · pdf file ·...

Concentration of ions – dilute chloride solution

Materials: 0.001 M NaCl solution, wooden splinter, matches

Apparatus: electrolytic cell, 2 test tubes, power supply, connecting wires

Line Diagram:

Electrode Observation (change in colour of solution, bubbles etc., test tubes)

Gas test (describe gas test and observation

Inference (what does your observation tell you)

Anode (+) Ion discharged:

Cathode (-) Ion discharged:

Concentration of ions

Materials: 2.0 M NaCl solution, wooden splinter, blue litmus paper

Apparatus: electrolytic cell, 2 test tubes, power supply, connecting wires

Line diagram:







Materials: 0.001 M CuCl2 solution, wooden splinter

Instructions for F4S students:

Please make sure you

complete these. If you are

missing any worksheet, please

print it and complete it.

Apparatus: electrolytic cell, 1 test tube, power supply, connecting wires

Line diagram:







Materials: 2.0 M CuCl2 solution, wooden splinter, blue litmus paper

Apparatus: electrolytic cell, 1 test tube, power supply

Line diagram:






Type of electrodes – inert carbon electrodes

Materials: 1.0 M CuSO4 solution,

Apparatus: electrolytic cell, 1 test tube, wooden splinter, power supply

Line diagram:






Type of electrodes – active electrodes

Material: 1.0 M CuSO4 solution, two copper metal strips as electrodes (about 1cmX6cm)

Apparatus: 100 cm3 beaker, power supply

Line diagram:






Electrolysis of molten sodium chloride using graphite electrodes

Ions present: Na+, Cl-

Electrolysis of 0.05 mol dm-3 sodium chloride solution using graphite electrodes

Ions present: ………………………………..

Electrolysis of copper(II) sulphate solution using graphite electrodes

Electrode Anode (+) Cathode (– )

Half-equation Cl- Cl + e

Cl + Cl Cl2

-----------------------------------------------

2Cl- Cl2 + 2e

Na+ + e Na

Observation 1. Bubbles of gas are released.

2. A greenish yellow gas that turns

blue litmus paper to red, then

white is released

1. A silvery shiny substance is

deposited at the cathode

Description 1. Each chloride ion loses an electron

to form a neutral chlorine atom.

2. Two chlorine atoms combine to

form a chlorine molecule.

3. Chlorine gas is released at the

anode.

1. Each sodium ion accepts an

electron and becomes a sodium

atom.

2. Sodium metal is discharged at the

cathode.

Overall ionic

equation

Anode: 2Cl- Cl2 + 2e

Cathode: 2Na+ + 2e 2Na

Overall: 2Na+ (l) + 2Cl- (l) 2Na (s) + Cl2 (g)


Half-equation

Observation

Description

Reason:

Overall ionic

equation

Ions present:

Electrolysis of 1.0 mol dm-3 silver chloride solution using graphite electrodes (concentrated soln. >0.5M)

Ions present:

Electrolysis of copper(II) sulphate solution using copper electrodes (active electrodes)


Ionic half equation

Observation

Description

Reason:

Overall ionic

equation


Ionic half equation

Observation

Description

Overall ionic

equation

Ions present: …………………………………

Electrolysis of dilute sulphuric acid using graphite electrodes

Ions present: ………………………………..


Ionic half equation

Observation

Description

Overall ionic

equation


Half-equation

Observation

Description

Reason:

Overall ionic

equation

Lab: Voltaic cells

Pre-lab

1. Draw a simple voltaic cell and label it in the space below using zinc and copper electrodes

and sodium chloride solution as the electrolyte.

Observations and Analysis

Pairs of metals

Voltmeter reading (V)

Observation Negative terminal

Half-equations

Cu/Mg

Anode: Cathode:

Cu/Fe

Anode: Cathode:

Cu/Zn

Anode: Cathode:

Cu/Cu

Anode: Cathode:

Zn/Mg

Anode: Cathode:

Fe/Zn

Anode: Cathode:

Analysis questions:

1. What does the voltmeter reading represent?

…………………………………………………………………………………………………………..

2. How did you determine which metal is the negative terminal in the experiment if you had no

knowledge of the electrochemical series.

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3. What observation can you make about the negative terminal? Explain your observation.

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4. Based on your results, arrange the metals Zn, Mg, Cu and Fe in order of decreasing

tendency to lose electrons.

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5. Draw a diagram below to compare the electrolytic cell and voltaic cell (this is based on what

you know about the electrochemical cells).

6. Very briefly, state below what parts of this chapter (a) you understood and are able to do

very well and what parts (b) you find difficult and have not mastered yet. If needed, illustrate

with examples.

(a)

(b)

HAZE WORK 15 SEPTEMBER 2015 AGAMA F4 TOPIK : IBADAT – Jual Beli, Hutang, Insurans dan Gadaian Jawab semua soalan dalam test pad. 1 Senaraikan rukun jual beli

[4 markah]

2 Jelaskan dua jenis jual beli yang dilarang dan tidak sah

[4 markah]

3 Jelaskan rukun-rukun hutang. [6 markah]

4 Terangkan dua perbezaan antara hutang dan riba. [4 markah] 5 Jelaskan dua hikmah diharuskan berhutang. [4 markah]

6 Huraikan perbezaan antara insurans Islam dan insurans

konvensional. [6 markah]

7 Terangkan tiga hikmah gadaian

[6markah]

8 Jelaskan tiga perbezaan antara amalan gadaian Islam dengan bukan Islam

[6markah]

HAZEWORK : 15 September 2015

BIOLOGY FORM 4S: Fill in the blanks.

1. Diagram 1 below shows the stages of a cell division P.

Diagram

(a) (i) Name the type of cell division P shown in Diagram 2.

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[1 mark ]

(ii) Name one plant structure and one animal structure where this type of cell division occurs. Plant structure : ……………..........................................................

Animal structure : ……………………………….................................

[2 marks]

(b) (i) Name the stages W, X, Y and Z.

w..........................................................................................................

X...........................................................................................................

Y............................................................................................................

Z ………………………………………………….......................................

[2 marks]

(c) Describe what happens during stage W.

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[1 mark]

(d) Describe what happens during stages X and Y.

X: …………………………………………………………………………………………….

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Y: ……………………………………………………………………………………………..

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[2 marks]

(e) (i) State the number of daughter cells produced from a single parental cell after the cell division is completed. …………………………………………………………………………………..…………..

[1 mark]

(ii) State the number of chromosomes in the parental cell.

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[1 mark]

(iii) State the number of chromosomes found in a daughter cell.

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[1 mark]

(I) State two importance of process X.

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[2 marks]

2. Table 1 shows information about the composition of a fruit.

Nutritional Content

Amount present in 100 g of fruit

Energy 180 kJ

Protein 2.1g

Sugars 8.6 g

Fats Trace

Fibre 2.5 g

Minerals Trace

Vitamins Trace

Table 1

(a) (i) The average daily amount of protein needed by humans is 65 g. How many kilograms of

this fruit would a person need to eat if this were his only source of proteins?

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[ 2 marks]

(ii) List the four main chemical elements from which proteins is made.

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[ 2 marks]

(b) Describe how the fruit can be tested for reducing sugars. State what is observed if a reducing sugar is present.

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[2 marks]

(c) 3.0 mI of the fruit juice is needed to decolourise 1 ml of DCPIP solution. If 1.0 mI of 0.1% ascorbic acid is needed to decolourise I mI of DCPIP solution, calculate the concentration of vitamin C in the fruit juice. ……………………………………………………………………...…………………………….

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[ 3 marks]

(d) This type of fruit contains fibre which is important for health .

(I) Suggest one reason for the importance of eating food rich in fibre.

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[ 1 mark]

(ii) This vitamin is found abundantly in citrus fruits and green vegetables . State one

function of this vitamin in our human body

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. ......……………………………………………………………………….......…...……………….

[ 1 mark]

(e) A small bird kept in the zoo is being fed the above mentioned fruit daily. How many grams of the fruit would a keeper need to feed the bird to meet its daily energy requirements of 3 50 kJ ? …………………………………………………………….........…………………………………..

.......……………………………………………………………………….......…...……………….

[ 1 mark]

3. Table 2 shows the daily energy and nutrient requirements of 4 groups of individuals.

Individual

Body Mass

( kg )

Energy Requirement

(kJ)

Protein

( g )

Vitamin D

(mg)

Iron (mg)

Infant ( 1 year old )

10 3500 25 10 6

Adolescent Female ( 16 years old)

54 10,000 60 4 15

Adolescent Male ( 16 years old)

62 12,000 90 4 12

Male Labourer ( 35 years old)

75 15,000 50 3 10

Table 2

(a) Based on Table 2, state 3 factors that affect the daily requirements of an individual.

(i). …………………………………………………………………................……………………..

(ii) ....…………………………………………………………………………........………………….

(iii) ……………………………………………………………………...…..............………………..

[ 2 marks]

(b) Based on the data in Table 2, explain the following::

(i) The daily requirement of Vitamin D of an adolescent female is lower than the daily

requirement of Vitamin D of an infant?

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[ 2 marks]

(ii) An adolescent female needs to have more iron in her diet compared to an adolescent male

of the same age.

…………………………………………………………………................……………………..

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[ 2 marks]

(iii) A male adult labourer has a higher energy requirement than a adolescent male .

…………………………………………………………………................……………………..

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..........………………………………………………………………...…..............………………..

[ 2 marks]

END OF WORKSHEET

Prepared by Khoo Gek Ean

Haze Work:

15 September 2015

SEKOLAH SRI TENBY

Haze Work for 15th September

TINGKATAN 4

PENDIDIKAN MORAL

Ketua Polis Negara X mengarahkan polis menembak suspek yang terbabit dalam aktiviti

membakar ladang, jika melawan sewaktu ditangkap.

Bersetujukah anda dengan tindakan tersebut? Terangkan. (10 markah)

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SEKOLAH SRI TENBY

Haze Work for 15th September 2015

TINGKATAN 4

SEJARAH

Sebagai warganegara Malaysia yang cintakan negara, jelaskan persiapan yang mesti anda

lakukan untuk mempertahankan negara kita daripada sebarang bentuk penjajahan pada masa

hadapan. (10 markah)

Mulakan jawapan anda dengan :

Antara persiapan yang boleh saya lakukan ialah …………………………………………………..

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Contoh jawapan untuk soalan 1:

Mematuhi ajaran agama

Setia kepada negara

2. Berdasarkan pengkajian anda terhadap kegemilangan kerajaan Turki Uthmaniyah, apakah

iktibar yang boleh diambil untuk menjadikan negara dan bangsa Malaysia lebih gemilang

pada masa hadapan. (10 markah)

Sebagai rakyat Malaysia kita perlu, ………………………………………………………………..

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Contoh jawapan untuk soalan 2:

Memilih pemimpin yang layak

Menghormati hak asasi

Solution of Triangles

Form 4S and Form 4M

Additional Mathematics – SASBADI

Pg 131 10.3A Calculate area of triangles

Q1/2/3/4

Pg 131 to Pg 132 10.3B Calculate the area of each of the following

trangles.

Q1 and Q2

Pg 132 10.3C Solve the following problems

Q1 and Q2


Additional Mathematics for Form 4

Solution of Triangles

Instructions:

The following must be completed today

1. Additional Mathematics – SASBADI

a) Pg 131 Q10.3A Calculate area of triangles

Q1/2/3/4

b) Pg 131 to Pg 132 10.3B Calculate the area of each of the following

triangles.

Q1 and Q2

2. Pg 132 10.3C Solve the following problems

Q1 and Q2


Mathematics for Form 4

Angles of Elevation and Depression

Instruction:

Referring to the book Top Choice Mathematics,

do the following exercise.

SPM Practice 10

a) Part 1 Objective questions Q1 to Q12

b) Part 2 Subjective question Q1 to Q6

Form 4S and Form 4M

Top Choice Mathematics – Pelangi

Pg 141 to pg 145

SPM Practice 10

Part 1 Objective Q1 to Q12

Part 2 Subjective Q1 to Q6


Question 1

Read the passage and answer the questions given.

A growing trend is internet computer addiction among teens. Unfortunately, it has

adversely affect teenagers by giving various physical and emotional complications.

Internet addiction among teens will lead to one thing - computer dependency.

Teens suffering from Internet addiction will most likely exhibit some or all of the

following symptoms:

• Excessive time – Your teen devotes increasing amounts of time to the Internet.

This involves all forms of Internet activity, from instant messaging (IM), to email,

surfing sites, participating in chat rooms and updating their Facebook status.

• Withdrawal from friends and activities – As the teen spends more and more time

online and not in the physical company of others, the pattern emerges that he or she

withdraws from friends and normal activities.

• Lies – Asked about the amount of time spent online, what they were doing, or

confronted with evidence on cell phone bills for texting, IMs, or downloading, they

would elaborate and fabricated dissertations.

• Fatigue and other physical symptoms – Internet addicts look and act sleep

deprived. They seem tired all the time, due to the fact that they stay up late or get up

early so they can be on the Internet.

• Poor grades or job performance – Evidence of decreased attention paid to activities

and responsibilities due to increased time spent on the Internet shows up in poor

grades that they achieved in their examinations.

• Emotional outbursts – When asked about time spent online, the Internet addicted

teens would be easily triggered by such simple question. They may erupt in an

emotional outburst, be annoyed or irritable whenever they‟re not online.

Name: _______________________________________

English Form 4

NFS©2014

To prevent and end internet computer addiction among teens is somewhat a

challenge. A parent of a teenager suffering from internet and computer addiction

should act upon it as soon as they see the symptoms by trying to limit the amount of

hours the teenager spends on the computer. Encouraging the child to take up other

pastimes or hobbies can in most cases turn their attention away from the computer.

An organisation has been specifically set up to combat internet computer addiction

among teens with their computer and internet addiction. The organisation is called

The Center for Internet Addiction Recovery and can be found online at

http://www.netaddiction.com.

Practice 1

Read the passage and complete the graphic organiser below with the correct answers.

Name of addiction:

1. ……………………………….

………………………………….

Symptoms:

2. ……………………………….

………………………………….

3. ……………………………….

………………………………….

4. ……………………………….

………………………………….

5. ……………………………….

………………………………….

6. ……………………………….

………………………………….

7. ……………………………….

………………………………….

Organisation for treating Internet

Addiction:

9. ……………………………….

………………………………….

Website:

10. ……………………………….

………………………………….

Alternative to combat Internet

Addiction:

8. ……………………………….

………………………………….

http://www.netaddiction.com/

Question 2

Questions 1 – 30 are based on the following passage.

1 Air pollution has become a devastating child killer in India and

throughout Asia. Children like Harvind, who live in cities, are the

unintended victims of the rapid industrialisation and urbanisation of most

Asian countries, poisoned by breathing air polluted by motor vehicle

exhausts and industrial smokestacks. But kids in rural Asia don't escape

harm either. Children die every year from breathing smoke from cooking

fires that turn their own homes into death traps.

5

2 Because diseases tied to environmental factors can have more than

one cause, it's impossible to state flatly how many children are victims

of air pollution. But combined statistics from the World Health

Organisation, private health groups, medical journals and hospital

officials point to an inescapable conclusion: From teeming cities to tiny

rural villages, every year at least one million of our children die or suffer

life-shortening diseases, such as respiratory infections and pneumonia,

brought on by toxic air. Throughout Asia the signs of a huge problem

are inescapable.

10

3 Dr Balu Raj, a paediatrician at Manipal Medical Centre in India, who

has been in practice for 45 years, reports that nearly 90 per cent of his

young patients have respiratory illnesses. And he is beginning to see

these problems in very young babies. "My youngest patient was a two-

and-a-half-month-old boy who I had to hospitalise because of severe

retractions. Twenty years ago we hardly ever saw bronchial asthma in

children younger than one year."

15

20

4 About half of some 9000 children treated as outpatients at the Lakeside

Medical Centre and Hospital in Bangalore, India, have asthma and

other respiratory ailments. In Delhi, a survey of 20,000 school children

found that one in every eight had asthma. For children in China's cities,

just breathing is the equivalent of smoking two packets of cigarettes a

25

day. Respiratory disease isn't the only problem brought on by air

pollution.

5 The threat begins even before birth. A study in Kaohsiung, Taiwan,

found a correlation between maternal exposure to sulphur dioxide

during the first trimester of pregnancy and lowered birth weight.

Newborns in the Philippines are showing high levels of lead, mercury,

cadmium and copper in their blood. And in Bangkok, physicians have

found deadly particulates in the umbilical cords of newborn babies.

30

6 At greatest risk from both indoor and outdoor air pollution are children

under five years of age. The Boston-based Health Effects Institute

estimates that more than a million children in Asia will not live to see

their fifth birthday because they will succumb to illnesses linked directly

to air pollution. Numerous studies over the past five years, including a

major one released last year by the University of Southern California,

have demonstrated that when it comes to air pollution, children are not

merely small adults.

35

40

7 "Because children's tracheas are shorter than adults', the pollutants in

the atmosphere can easily invade the depths of their lungs," says Dr

Xiaochuan Pan, a professor at the Peking University School of Public

Health in Beijing.

45

8 Adds Dr Michael T. Kleinman, an air pollution expert at the University of

California, Irvine, "There are many differences between children and

adults in the ways that they respond to air pollution. For example,

children take in more air per unit body weight at a given level of

exertion than do adults. When a child is exercising at maximum levels,

such as during a soccer game or other sports event, they may take in

20 per cent to 50 per cent more air - and more air pollution - than would

an adult in comparable activity."

50

9 According to Dr Wilson Fung, a Hong Kong paediatrician, "The nose is

like an air filter, and because their noses are smaller than adults',

children's noses get blocked up sooner by secretions and swelling. This

forces them to breathe through their mouths more often. The mouth is

not an air filter, and particulates go directly to the lungs, causing greater

damage."

(Adapted from rdasia.com)

55

1. From paragraph 1,

(a) who are the innocent victims of air pollution?

______________________________________________________________

[ 1 mark ]

(b) what causes the air pollution in most Asian countries?

______________________________________________________________

[ 1 mark ]

2. From paragraph 2, state two main illnesses that can be fatal.

(a) _________________________________________________________

[ 1 mark ]

(b) _________________________________________________________

[ 1 mark ]

3. From paragraph 3,

(a) state a word that describes the serious condition that plagued the

children.

______________________________________________________________

[ 1 mark ]

(b) name the life-shortening diseases suffered by the children.

______________________________________________________________

[ 1 mark ]

4. (a) From paragraph 6, why more than a million children in Asia will not live to

see their fifth birthday? ______________________________________________________________

[ 1 mark ]

b) From paragraph 8, why are children easily affected by air pollutions?

______________________________________________________________

[ 1 mark ]

5. In your opinion, what‟s the best way to overcome pollution? Name two ways

that the government can do to rectify this problem.

______________________________________________________________

______________________________________________________________

[ 2 marks]

6 Based on the passage given, write a summary:

How air pollution affects the children

Credit will be given for use of own words but care must be taken not change the

original meaning.

Your summary must:

be in continuous writing form (not in note form)

use materials from lines 9 to 37

not be longer than 130 words, including the 10 words given below

Begin your summary as follows:

About half of some nine thousand children treated as outpatients at the

Lakeside Medical Centre and Hospital in...

[15 marks]

concentration of ions dilute chloride solution · pdf file ·...

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