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HeLLO Students

Welcome to the Chemistry site for 2009.
Through this blog, we hope to overcome the challenges posed by time constraint,
in teaching all of you Chemistry and help to prepare you well for the coming national exam.
wisHlisT♥
mY studeNts scorE A1 for exAms
going on holiday soon


cHitChat♥



daNce awaY♥


liNkY♥
‡ Kuo CHuan Chemistry bLog

‡ 4 Love chemistry wiki link

‡ Combined science classes website link

tHe pasT♥
specimen papers for pure chemistry
Dear students,

These are the links to specimen paper that some of you have asked me to upload. I have uploaded another year paper for your practice.

Prelim2002P1.doc
Prelim2002P2.doc
Prelim2003P1.doc
Prelim2003P2.doc
Posted on: Sunday, August 16, 2009
Posted at: 5:14 AM

Electrolysis worksheet answers
Hi all,

These are the answers to electrolysis worksheet given out during holidays.Please clarify your answers if need be. Thank you.

http://www.4shared.com/file/96321860/31c41cf1/Answers_to_electrolysis.html
Posted on: Thursday, April 2, 2009
Posted at: 12:04 AM

Answers for speed of reaction worksheet
Dear students,

Below is the soft copy of answers for speed of reaction for your reference:

http://www.4shared.com/file/95226777/da840eaf/Speed_of_reaction_worksheet_answers.html

Posted on: Thursday, March 26, 2009
Posted at: 9:49 PM

Prelim paper set A
Dear students,

I am attaching the first prelim paper for your practice. Once I have most of the class emails, I will upload the subsequent papers into the wiki link.

Please try after you have revised the topics instead of before so that you can gauge your understanding better.

http://www.4shared.com/file/91240774/1de9d17a/Prelim2002P1.htm

http://www.4shared.com/file/91240868/618eb2d/Prelim2002P2.html
Posted on: Thursday, March 5, 2009
Posted at: 6:27 AM

Assignments to complete and things to bring for March holidays lesson
Dear students,

Please complete the following assignments before reporting for the March lessons.

1. MCQ on speed of reaction
2. Graphs on effect of concentration on speed of reaction.
3. structured questions on speed of reaction

Please bring your workbook (if you have it with you) or the assignment on redox that was assigned to you earlier as I need to go through the data-based question.

Other things to bring:

1. ammonia notes and worksheet (I will go through questions that you can't do)

2. speed of reaction notes and worksheets

Posted on: Wednesday, March 4, 2009
Posted at: 7:29 PM

Chapter: Heat changes
For this chapter, you may wish to look through the link provided below:

http://studio4learning.tv/sciences/chemistry/heat-in-chemistry/enthalpy/

Remember to refer back to notes and textbook when in doubt.

Posted on:
Posted at: 4:58 PM

Chapter: Electrolysis
At the end of the lesson, you should be able to:

  1. Describe electrolysis as the conduction of electricity by an ionic compound (an electrolyte), when molten or dissolved in water, leading to the decomposition of the electrolyte
  2. Describe electrolysis as evidence for the existence of ions which are held in a lattice when solid but which are free to move when molten or in solution
  3. Describe, in terms of the mobility of ions present and the electrode products, the electrolysis of molten sodium chloride, using inert electrodes
  4. Predict the likely products of the electrolysis of a molten binary compound
  5. Apply the idea of selective discharge based on
    (i) cations: linked to the reactivity series (see 9.2)
    (ii) anions: halides, hydroxides and sulfates (e.g. aqueous copper(II) sulfate and dilute
    sodium chloride solution (as essentially the electrolysis of water))
    (iii) concentration effects (as in the electrolysis of concentrated and dilute aqueous sodium chloride)

    (In all cases above, inert electrodes are used.)

  6. Predict the likely products of the electrolysis of an aqueous electrolyte, given relevant information
  7. Construct ionic equations for the reactions occurring at the electrodes during the electrolysis, given relevant information
  8. Describe the electrolysis of aqueous copper(II) sulfate with copper electrodes as a means of purifying copper (no technical details are required)
  9. Describe the electroplating of metals, e.g. copper plating, and state one use of electroplating
  10. Describe the production of electrical energy from simple cells (i.e. two electrodes in an electrolyte) linked to the reactivity series and redox reactions (in terms of electron transfer)
Electrolysis PPT

Posted on:
Posted at: 4:34 AM