2011-01-30

Visitors from Jawa Tengah


Recently a bus of teachers & students from Jawa Tengah visited my school. Initially, the visitors were planned to observe my chemistry class with 5H.  But it went out not as planned. Few teachers & students dropped by my chemistry class and stayed with us for a while.  At that moment, I was showing a video relating reaction between hydrogen & iodine. The girls were asked to explain the requirement for a chemical reaction. Luckily the lesson went well as planned.

2011-01-29

Scientists' Contribution towards Development of Atomic Structure


  1. J.J. Thomson discovered electron.
  2. Ernest Rutherford discovered the proton
  3. James Chadwick discovered the neutron.
We get to know more about an atom thanks to their effort.

In your opinion, how does an atom look like? How about a carbon atom?

Please respond  by leaving your comments & names.

2011-01-28

Effect of Concentration of Sodium Thiosulphate on its Rate of Reaction with Sulphuric Acid

5C students carried out their investigation to study the effect of concentration of sodium thiosulphate on its rate of reaction with sulphuric acid on 24 Jan 2011.

Before the experiment, they were ready with their experiment plan. Most of them were able to write a satisfactory experiment plan. However, the aim of the experiment, problem statement were not specific.  Some even were not ready with their table. Hopefully they would improve after discussing with me.

The students were able to carry out the experiment with correct technique & skills. Well done, 5C students!
The student was taking time for mark 'X' dissapear from view.
 
Cooperation is shown througout the experiment.

The conical flask is swirled once sulphuric acid is added into sodium thiosulphate.

Mark 'X' is observed from top of the conical flask. The other pair of students were discussing their data.

2011-01-02

Chemistry SPM 2010 Paper 1

Chemistry SPM was on 6 Dec 2010, which is a week ago. As I go through the question paper in more details, the arrangement of the question was slightly different compared to the last few years. Normally questions involving calculation or more difficult question are arranged at later part. But this year the questions are seems more likely arranged according to topics in chemistry syllabus.

 

Chapter

No of Question

2   Structure of atom                                    

2

3   Chemical Formulae & Equations

3

4   Periodic Table of Elements

4

5   Chemical Bonds

6

6   Electrochemistry                                     

4

7   Acid & Bases                                  

5

8   Salts                                                       

2

9   Manufacture Substances in Industry        

5

1   Rate of Reaction                                     

4

2   Carbon Compounds                               

7

3   Redox                                                    

4

4   Thermochemistry                                    

3

5   Chemicals for Consumer

1

For answer for this paper, please click here.

2010-12-13

Chemistry SPM 2010 Paper 3

Question 1:
  • Reactivity of Group 1 elements with water
Question 2:
  • The role of water towards the acidic properties of ethanoic acid
Question 3:
  • The effect of copper(II) sulphate on the rate of reaction between metal and acid

2010-12-11

Chemistry SPM 2010 Paper 2




Section A

Question 1 : (Chapter 2: The Structure of Atom)
  • State of matter
  • Conversion of matter
  • Kinetic theory of matter
Question 2: (Salts & Numerical Calculation involving Chemical Equation)
  • Heating of carbonate salt
  • Writing chemical equation
  • Numerical calculation involving chemical equation: molar mass, no of particles, molar volume
Question 3: (Periodic Table of Elements)
  • Position of an element in periodic table
  • Group 18 elements
  • Chemical properties of group 1
  • Compare & explain the difference in electronegativity between two elements
Question 4:(Chemical Bonds)
  • Electron arrangement of an atom & ion
  • Formula of compound
  • Formation of covalent bond
  • Properties of covalent compound & ionic compound
Question 5: (Electrolytic Cell & Voltaic Cell)
  • Writing half equation of anion
  • Identify negative terminal & anode
  • Observation for both cells & explain
  • Chemical test to identify gas produced
Question 6: (Acid, Bases & Salts)
  • acid-base titration
  • calculation to determine molarity of acid
  • identify monoprotic acid & diprotic acid
  • confirmatory test for sulphate ion
Section B

Question 7: (Chemical Formulae & Equation, Carbon Compounds, Chemicals for Consumer)
  • Determine empirical formula & molecular formula of a hydrocarbon
  • Drawing the structural formula & naming the isomer of the hydrocarbon
  • Based on given food labels,  name the food additives  & determine the type of food additives & their funition.
Question 8:( Rate of Reaction)
  • The meaning of rate of reaction & identify the factor that affects the rate of reaction
  • Based on graf volume of gas released against time, compare the rate of reaction between two experiment by using the Collision Theory
  • Suggest one way to obtain a curve & explain using the Collision Theory
Question 9: (Electrochemistry)
  • Electrolysis of a concentrated aqueous solution: half equation at the cathode, formation of product at the anode & chemical test
  • Electroplating an iron spoon with silver
Questin 10: (Thermochemistry)
  • Heat of neutralisation of two different monoprotic acid with sodium hydroxide: explain the difference.
  • Determine the change in temperate based on given heat of neutralisaiton
  • Describe experiment to determine the heat of neutralisation.

2010-11-25

Determing Melting Point

Example of Essay Question:
Solid Z has a melting point of 65oC.  Describe a laboratory experiment to determine the melting point of Z. Your answer should show how the melting point of Z is determined.

Requirement of the Question 

a) Procedure and diagram
b) A table showing time and temperature.
c) Sketch a graph temperature of substance Z against time.
d) Show how melting point of substance can be obtained from the graph.

2010-11-21

Cave of Giant Crystals, Mexico



The crystals in the cave are made of selenite, a form of the common mineral gysum.  Slelenite is translucent & soft.  Research carried out by the scientist through uranium-thorium dating suggests the larget crystals are about 600 000 years old.

For more details, visit http://www.crystalinks.com/mexicocrystals.html

2010-11-12

Perfect Score Chemistry Module Year 2010

Perfect Score Chemistry Year 2010 compiles common questions for Paper 2 & 3 SPM into 4 set. 

Set 1: Chapter 2, 3, 4, & 5 in Form 4
Set 2: Chapter 6 in Form 4 & Chapter 3 in Form 5
Set 3: Chapter 7 & 8 in Form 4; Chapter 1 & 4 in Form 5
Set 4 : Chapter 2 & 5 in Form 5, Chapter 9 in Form 4

To download,
This set is helpful especially to know better common questions in Paper 2 & 3 SPM.

2010-10-07

Trial SPM Wilayah Persekutuan Chemistry Paper 3 2010

Yesterday, my students sat for the exam. There are only two questions.
  1. Determining heat of displacement of copper by different metals.
  2. Planning an experiment to determine the position of carbon based on it ability to reduce metal oxies.
The first question were somehow the same like one of the past year question(heat of neutralisation).  My both classses did carry out this experiment. But I wonder whether they can answer the question with high score. Best of luck to all of them which is going to sit for Chemistry Trial SPM Paper 1 & Paper 2 tomorrow!

2010-10-06

Question Analysis Chemistry Trial SPM Paper 3 2010 from Different States


States
Question 1
Question 2
Question 3
SBP
Reactivity of alkali metals towards oxygenEffect of metals on iron rustingEffect of size of zinc on the rate of reaction
Terengganu
Heat of combustion of various alcoholsReactivity of alkali metals towards oxygenEffect of catalyst on the rate of decomposition of hydrogen peroxide
Kedah
Reactivity of alkali metals with oxygenEffect of quantity of catalyst on the rate of decomposition of hydrogen peroxideEffect of metals on the rusting of iron
Penang
Electrical conductivity of lead(II) bromide & naphthalene in molten stateEffect of the amount of catalyst on the rate of reactionInvestigate the effect of ethanoic acid & ammonia solution on the coagulation of latex
Negeri Sembilan
Construct the electrochemical series based on voltmeter reading by using different metals pair with copperDetermine the concentration of potassium hydroxide by using titration methodInvestigate the electrical conductivity of lead(II) bromide & naphthalene
Sabah
Compare heat of combustion of alcoholsReactivity of halogens with iron woolInvestigate the effect of metals on iron rusting
Perak
End-point of titration
-
Effect of temperature on the rate of reaction
MRSM
Construct ionic equation for the precipitation of silver chloride
-
The effect of other metals on rusting of iron
Johor
Effect of other metals on rusting of iron
-
Effect of catalyst on the rate of reaction
Perlis
Construct electrochemical series based on the potential difference of pairs of metals
-
Effect of concentration/catalyst on the rate of reaction between an acid & metal
Kelantan
Heat of combustion of various alcohols
-
Effect of the type of electrode on the product of electrolysis at anode
Kuala Lumpur
Heat of displacement of copper by different metals
-
determine the position of carbon in the reactivity series based on its ability to reduce metal oxides
Pahang
Heat of combustion of alchols
-
Effect of catalyst on the rate of decomposition of hydrogen peroxide
Mallaca
Relationship between concentration of nitric acid and its pH value
-
Investigate the difference in electrical conductivity between an ionic compound and a covalent compound
Selangor
Effect of metal on rusting of iron
-
Effect of temperature on the rate of reaction

2010-09-20

Trial Chemistry SPM 2010 from Different State



Please visit http://chngtuition.blogspot.com/2010/09/2010-spm-all-chemistry-state-trial-exam.html
to download Trial Chemistry SPM from

  1. Johor
  2. Perak
  3. Kedah
  4. Terengganu
  5. Perlis
  6. Kelantan
  7. Pahang
  8. Melaka
  9. Penang
  10. Negeri Sembiln
  11. Selangor
  12. Sabah
  13. Penang
  14. Selangor
  15. MRSM
  16. Kuala Lumpur
chem2u will update from time to time once chem2u find questions from other states too.

2010-09-05

Chemistry Form 4 Finals Mallaca 2009


You may look at this set of question how the real format of  Paper 1, 2 & 3 looks like while preparing for the coming finals.

All the best, any doubts of the question, do leave a comment here. I''ll help to clarify the concepts.

Download