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Monday, August 17, 2009
'N' Level Preliminary Examination 2009

This is a gentle reminder that the 'N' level students will be sitting for their Science(Chemistry) paper tomorrow.

All the best to 4N6 and 4N7!

Regards,
Miss Cindy Ho

happyy-stopp 5:45 PM
Sunday, August 16, 2009
Answer Key for WRSS Preliminary Exam 2007

Dear students,

The answer for WRSS Prelim 2007 is posted as below. Please marked them against your own answers and do not copy bindly.

Thank you.





happyy-stopp 5:43 PM
Monday, August 03, 2009
Important Reminder!

Students, please be reminded that you have Chemistry Class Test on the following dates.

3E1: 4th August
3E4: 5th August
3N6: 6th August

The topics involved are covalent and ionic bonding, acids and its word and chemical equation writing.

Study hard and Good luck to all!

Regards,
Miss Cindy Ho

happyy-stopp 5:44 PM
Secondary 3: Acid reaction worksheet answers

Students, please get back to me if you do not understand the mistakes that you have made in this paper.

1) potassium hydroxide reacting with nitric acid

word equation
potassium hydroxide + nitric acid -> potassium nitrate + water

Chemical equation
KOH + HNO3 -> KNO3 + H2O


2)magnesium carbonate reacting with sulfuric acid

word equation
magnesium carbonate + sulfuric acid -> magnesium sulfate + water + carbon dioxide

Chemical equation
MgCO3 + H2SO4 -> MgSO4 + H2O + CO2

3)sodium carbonate reacting with hydrochloric acid

word equation
sodium carbonate + hydrochloric acid -> sodium chloride + water + carbon dioxide

Chemical equation
Na2CO3 + 2HCl -> 2NaCl + H2O + CO2

4) lithium hydroxide reacting with sulfuric acid

word equation
lithium hydroxide + sulfuric acid -> lithium sulfate + water

Chemical equation
2LiOH + H2SO4 -> Li2SO4 + 2H2O

5)calcium reacting with carbonic acid

word equation
calcium + carbonic acid -> calcium carbonate + hydrogen

Chemical equation
Ca + H2CO3 -> CaCO3 + H2

happyy-stopp 9:26 AM
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