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: 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: 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.
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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:
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: 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:
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
Inference (what does your observation tell you)
Anode (+) Ion discharged:
Cathode (-) Ion discharged:
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)
Electrode Anode (+) Cathode (– )
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)
Electrode Anode (+) Cathode (– )
Ionic half equation
Observation
Description
Reason:
Overall ionic
equation
Electrode Anode (+) Cathode (– )
Ionic half equation
Observation
Description
Overall ionic
equation
Ions present: …………………………………
Electrolysis of dilute sulphuric acid using graphite electrodes
Ions present: ………………………………..
Electrode Anode (+) Cathode (– )
Ionic half equation
Observation
Description
Overall ionic
equation
Electrode Anode (+) Cathode (– )
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.
…………………………………………………………………………………………………………...
…………………………………………………………………………………………………………...
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 : ……………..........................................................
(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 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?
…………………………………………………………………………………………………..
………………………………………………………………………………………………….
[ 2 marks]
(ii) List the four main chemical elements from which proteins is made.
…………………………………………………………………………………………………..
………………………………………………………………………………………………….
[ 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. ……………………………………………………………………...…………………………….
(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 ? …………………………………………………………….........…………………………………..