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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♥
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

Chapter: Ammonia
At the end of the chapter, you should be able to:
  1. Describe the use of nitrogen, from air, and hydrogen, from cracking oil,in the manufacture of ammonia
  2. State that some chemical reactions are reversible, e.g. manufacture of ammonia
  3. Describe the essential conditions for the manufacture of ammonia by the Haber process
  4. Describe the displacement of ammonia from its salts (LINK TO REACTIONS OF ALKALI)

    Ammonia PPT
    Ammonia Worksheet
Posted on:
Posted at: 4:15 AM

chapter: redox (textbook qns answers)
redox answer
Posted on: Monday, March 2, 2009
Posted at: 7:59 AM