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Biology; Chemistry; Physics: Post your doubts here!

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Dear Physics Students,

Check out fuchunphysics.wordpress.com

This blog contains teaching videos for Physics O' Level syllabus.
Chapters uploaded include:
1) Measurements
2) Kinematics
3) Dynamics
4) Mass, Weight and Density
5) Turning Effect of Force
6) Energy, Work and Power
7) Pressure
8) Kinetic model of matter

The teaching videos for the remaining chapters will be posted soon.
 
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yes oxidation state for both compounds.
what will be oxidation state of calcium nitrate
(1) Ca(NO3)2
and
(2) (NH4)2 CO3 ????
 
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yes oxidation state for both compounds.
what will be oxidation state of calcium nitrate
(1) Ca(NO3)2
and
(2) (NH4)2 CO3 ????

Both compounds have a oxidation number of 0
That is because

Ca has a charge of +2 and NO3 has a charge of -1
So there are two nitrate ions joined to one Calcium ion so 2 + 2(-1) = 0

Likewise,
NH4 ion has a charge of +1 and CO3 has a charge of -2, Since there are 2 ammonium ions, 2(+1) + (-2) = 0

So in both cases it adds up to 0 !
 
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can u plzzz tell me the best way 4 the preparartion of my Olevel exams in this Oct/Nov session and the book u prefr
I have already covered the whole course
 
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Both compounds have a oxidation number of 0
That is because

Ca has a charge of +2 and NO3 has a charge of -1
So there are two nitrate ions joined to one Calcium ion so 2 + 2(-1) = 0

Likewise,
NH4 ion has a charge of +1 and CO3 has a charge of -2, Since there are 2 ammonium ions, 2(+1) + (-2) = 0

So in both cases it adds up to 0 !
thnku
 
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Salam
I was revising my course and faced a few problms in the following topics
1 polymerisation 2 electroplating 3 titration
 
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scouserlfc: How to calculate change in velocity?
E.g. if an airplane is flying at 500 km/h due west. It then changes its direction to east and now its speed is 400 km/h. What would be its change in velocity??????? Would it be 100 or 900? Plz help.
 
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