Concentration of ions

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
Instructions for F4S students:
Please make sure you
complete these. If you are
missing any worksheet, please
print it and complete it.
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:
Electrode
Observation
(change in colour of
solution, bubbles etc.,
test tubes)
Gas test
(describe gas test
and observation
Anode (+)
Ion
discharged:
Cathode (-)
Ion
discharged:
Concentration of ions
Materials: 0.001 M CuCl2 solution, wooden splinter
Inference
(what does your
observation tell you)
Apparatus: electrolytic cell, 1 test tube, 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 CuCl2 solution, wooden splinter, blue litmus paper
Apparatus: electrolytic cell, 1 test tube, power supply
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:
Type of electrodes – inert carbon electrodes
Materials: 1.0 M CuSO4 solution,
Apparatus: electrolytic cell, 1 test tube, wooden splinter, power supply
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:
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:
Electrode
Observation
(change in colour of
solution, bubbles etc.,
test tubes)
Gas test
(describe gas test
and observation
Anode (+)
Ion
discharged:
Cathode (-)
Ion
discharged:
Electrolysis of molten sodium chloride using graphite electrodes
Inference
(what does your
observation tell you)
Ions present: Na+, Cl-
Electrolysis of 0.05 mol dm-3 sodium chloride solution using graphite electrodes
Electrode
Half-equation
Anode (+)
Cathode (– )
Cl-  Cl + e
Cl + Cl  Cl2
Na+ + e  Na
----------------------------------------------2Cl-  Cl2 + 2e
Observation
1. Bubbles of gas are released.
1. A silvery shiny substance is
2. A greenish yellow gas that turns
deposited at the cathode
blue litmus paper to red, then
white is released
Description
1. Each chloride ion loses an electron 1. Each sodium ion accepts an
to form a neutral chlorine atom.
electron and becomes a sodium
2. Two chlorine atoms combine to
atom.
form a chlorine molecule.
2. Sodium metal is discharged at the
3. Chlorine gas is released at the
cathode.
anode.
Overall ionic
Anode: 2Cl-  Cl2 + 2e
equation
Cathode: 2Na+ + 2e  2Na
Overall: 2Na+ (l) + 2Cl- (l)  2Na (s) + Cl2 (g)
Ions present: ………………………………..
Electrode
Half-equation
Anode (+)
Cathode (– )
Observation
Description
Reason:
Overall ionic
equation
Electrolysis of copper(II) sulphate solution using graphite electrodes
Ions present:
Electrolysis of 1.0 mol dm-3 silver chloride solution using graphite electrodes (concentrated soln. >0.5M)
Electrode
Ionic half equation
Anode (+)
Cathode (– )
Anode (+)
Cathode (– )
Observation
Description
Overall ionic
equation
Ions present:
Electrode
Ionic half equation
Observation
Description
Reason:
Overall ionic
equation
Electrolysis of copper(II) sulphate solution using copper electrodes (active electrodes)
Ions present: …………………………………
Electrode
Ionic half equation
Anode (+)
Cathode (– )
Observation
Description
Overall ionic
equation
Electrolysis of dilute sulphuric acid using graphite electrodes
Ions present: ………………………………..
Electrode
Half-equation
Observation
Description
Reason:
Overall ionic
equation
Anode (+)
Cathode (– )
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
Anode:
Cu/Mg
Cathode:
Anode:
Cu/Fe
Cathode:
Anode:
Cu/Zn
Cathode:
Anode:
Cu/Cu
Cathode:
Anode:
Zn/Mg
Cathode:
Anode:
Fe/Zn
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.
…………………………………………………………………………………………………………...
…………………………………………………………………………………………………………...
3. What observation can you make about the negative terminal? Explain your observation.
…………………………………………………………………………………………………………...
…………………………………………………………………………………………………………...
4. Based on your results, arrange the metals Zn, Mg, Cu and Fe in order of decreasing
tendency to lose electrons.
…………………………………………………………………………………………………………...
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.
……………………………………………………………………………………………..
[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.
………………………………………………………………………………………….…………..
………………………………………………………………………………………………….…..
[1 mark]
(d) Describe what happens during stages X and Y.
X: …………………………………………………………………………………………….
……………………………………………………………………………………………..
Y: ……………………………………………………………………………………………..
..................................................................................................................................
[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.
…………………………………………………………………………...…………………..
[1 mark]
(iii) State the number of chromosomes found in a daughter cell.
………………………………………………………………………………………………..
[1 mark]
(I) State two importance of process X.
…………………………………………………………………………………………………..
………………………………………………………………………………………………….
[2 marks]
2. Table 1 shows information about the composition of a fruit.
Nutritional Content
Amount present in 100 g of fruit
Energy
Protein
Sugars
Fats
Fibre
Minerals
Vitamins
180 kJ
2.1g
8.6 g
Trace
2.5 g
Trace
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?
…………………………………………………………………………………………………..
………………………………………………………………………………………………….
[ 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.
…………………………………………………………………………….……………………..
………………………………………………………………………………………………….
………………………………………………………………………………...…………………..
………………………………………………………………………………………………….
[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.
……………………………………………………………………...…………………………….
…………………………………………………………….........…………………………………..
.......……………………………………………………………………….......…...……………….
[ 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.
…………………………………………………………….........…………………………………..
.......……………………………………………………………………….......…...………....……….
[ 1 mark]
(ii) This vitamin is found abundantly in citrus fruits and green vegetables . State one
function of this vitamin in our human body
…………………………………………………………….........…………………………………..
. ......……………………………………………………………………….......…...……………….
[ 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
Infant
( 1 year old )
Adolescent Female
( 16 years old)
Adolescent Male
( 16 years old)
Male Labourer
( 35 years old)
Body Mass
( kg )
10
Energy
Requirement
(kJ)
3500
Protein
(g)
25
Vitamin D
(mg)
10
Iron
(mg)
6
54
10,000
60
4
15
62
12,000
90
4
12
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?
…………………………………………………………………................……………………..
……………………………………………………………………………........………………….
……………………………………………………………………...…..............………………..
[ 2 marks]
(ii) An adolescent female needs to have more iron in her diet compared to an adolescent male
of the same age.
…………………………………………………………………................……………………..
……………………………………………………………………………........………………….
……………………………………………………………………...…..............………………..
[ 2 marks]
(iii) A male adult labourer has a higher energy requirement than a adolescent male .
…………………………………………………………………................……………………..
……………………………………………………………………………........………………….
..........………………………………………………………………...…..............………………..
[ 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
Haze Work for 15th September 2015
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
Haze Work for 15th September 2015
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
Haze Work for 15th September 2015
English Form 4
Name: _______________________________________
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.
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:
Symptoms:
1. ……………………………….
………………………………….
2. ……………………………….
………………………………….
Alternative to combat Internet
Addiction:
3. ……………………………….
………………………………….
8. ……………………………….
………………………………….
4. ……………………………….
………………………………….
Organisation for treating Internet
Addiction:
9. ……………………………….
5. ……………………………….
………………………………….
………………………………….
6. ……………………………….
………………………………….
Website:
10. ……………………………….
NFS©2014
………………………………….
7. ……………………………….
………………………………….
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 5
harm either. Children die every year from breathing smoke from cooking
fires that turn their own homes into death traps.
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
10
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.
3
Dr Balu Raj, a paediatrician at Manipal Medical Centre in India, who 15
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 twoand-a-half-month-old boy who I had to hospitalise because of severe
retractions. Twenty years ago we hardly ever saw bronchial asthma in 20
children younger than one year."
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, 25
just breathing is the equivalent of smoking two packets of cigarettes a
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 30
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.
6
At greatest risk from both indoor and outdoor air pollution are children 35
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,
40
have demonstrated that when it comes to air pollution, children are not
merely small adults.
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
45
Health in Beijing.
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
55
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)
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]