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24 Oct
Posted by: sean in: Chemistry Qns & Ans, Good Learning Tools
1 comments: illuminate-x said…
THANK YOU SO MUCH for the tip for the weak/strong acid question! It came out for Chem Paper 2 today and I was so relieved I saw the post just yesterday. :)October 24, 2007 3:37 AM
WOW!
Popularity: 7%
Hi, I have a Chemistry question..
A metallic element, M, has the following properties:
less dense than water
soft
melts below 100C
occurs naturally as its chloride, formula MCl
the oxide of M reacts with water to form a solube hydroxide
Suggest how metal M can be extracted from its compounds. Explain your reasoning.
Also, how do I distinguish between hydrogen gas and nitrogen gas?
Popularity: 4%
22 Oct
Posted by: sean in: Chemistry Qns & Ans
Question:
Q1) Describe an expt that you wld caryy out to show that sulphuric acid is a strong acid but ethanoic acid is a weak acid
Ans: This questionis testing you on the properties of acid. There are 4 ways for you to differentiate acid - pH paper test, Reaction w Metal, Reaction with Carbonate, or Reaction with an Alkali. To differentiate the acidity of Sulphuric Acid and Ethanoic Acid, i would suggest to test the amount of CO2 Gas produced when certain amount of the acid are reacted with a certain mass of ,say calcium carbonate. Suphuric Acid, being stronger acid will tends to give off CO2 gas more and at a faster rate.
One more day and your O Level examinations will be kicked-start formally..
Understand that some are feeling tired and some bored after preparing for the Prelims, taken it and now another period of preparing for your O levels.
Come on! Cheer up! We have been through all this before..You are not walking alone..
Stay Focused and Determined..Just 1-2 more weeks…
If you happen to be still able to see this blog, check out the short video clip:
http://successessentials.blogspot.com/2007/07/inspiring-movies-most-influential.html
Last but not least,i would like to wish you:
ALL THE BEST TO YOUR COMING EXAMS!!!!
Q)Which gas is produced in large quantities by fractional distillation?
A. chlorine
B. ammonia
C. nitrogen
D. methane
Last question for the night. Come on..Students taking your Chemistry Paper 2 on next Wednesday. Time for you to answer this question.
Rgds
Sean
SimpleChemConcepts
Learnig Experience with A Difference
Popularity: 5%
Q)When solid potassium chloride is added to water, the temperature of the mixture falls. What conclusion can be made from this observation?
A. The process is endothermic.
B. The process is exothermic.
C. All solids dissolve with a fall in temperature.
D. Very little potassium chloride dissolves in water.
Anyone would like to share your answers for above Energy Changes questions?
Rgds
Sean
SimpleChemConcepts
Learning Experience with A Difference
Popularity: 6%
Q)Which pair of substances is most suitable for the preparation of copper(II) sulphate?
A. Aqueous copper(II) nitrate and aqueous sodium sulphate
B. Copper(II) carbonate and dilute sulphuric acid
C. Copper and dilute sulphuric acid
D. Copper(II) oxide and ammonium sulphate
Takers??
Rgds
Sean
SimpleChemConcepts
Learning Experience with A Difference
Popularity: 5%
A Chemistry Question that was posed by a local singapore student that is taking her O level this year.
Which of the following consists of the greatest number of atoms?
A. 4g of hydrogen gas, H2
B. 48g of solid magnesium, Mg
C. 71g of chlorine has, Cl2
D. 24 dm3 of argon gas, Ar at r.t.p.
Any takers??
Rgds
Sean
SimpleChemComcepts
Learning Experience with A Difference
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Here is another one for you to be exposed to:
Q) Which of the following compounds has the largest number of lone pairs of electrons on the central atom?
A) CCl4
B) NH3
C) CO2
D) H2O
Share your thoughts with us.
Rgds
Sean
SimpleChemConcepts
Popularity: 4%