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Biology; Chemistry; Physics: Post your doubts here!

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guys ...plx could any1 tell me wht are the most important..n least important chapter for chemistry olevels paper ....?..will b greatfull
 
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guys ...plx could any1 tell me wht are the most important..n least important chapter for chemistry olevels paper ....?..will b greatfull
well, always be ready for mole question. then reaction energy, organic awwwwwwwwwwwwwwwwww everything is important :p just do book reading once, and then do past papers from at least 2005 :)
 
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btw ...air ,oxgyen ,hydrogen, water.....is an very important topic in recent past year .....paper 1 has many questions from these topics
 
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anyone has notes for CRO, Practical Electricity (including diodes, capacitors) Electromagnetic induction...please share...i am weakest in these topic.:oops:
 
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Which of the following is a reaction of dilute sodium hydroxide?
A
It reacts with ammonium chloride to produce ammonia.
B
It reacts with calcium carbonate to produce carbon dioxide.
C
It reacts with copper(
II
) oxide to produce water.
D
It reacts with Universal Indicator solution turning it red
 
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Which of the following is a reaction of dilute sodium hydroxide?
A
It reacts with ammonium chloride to produce ammonia.
B
It reacts with calcium carbonate to produce carbon dioxide.
C
It reacts with copper(
II
) oxide to produce water.
D
It reacts with Universal Indicator solution turning it red
A. The hydroxides of potassium, sodium and calcium react with ammonium salts to give off ammonia.
 
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can anyone explain me the differences between empirical formula and relative molecular mass?
 
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Which pair of compounds could be used in the preparation of calcium sulfate?
A :calcium carbonate and sodium sulfate
B :calcium chloride and ammonium sulfate
C :calcium hydroxide and barium sulfate
D :calcium nitrate and lead(II) sulfate
 
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