Chemistry: Post your doubts here!

[Autumn98]

Can anyone help me with this question??

 

[Autumn98]

Whats is the oxidation of S in CS2? The answer says —2 but i calculated myself i got +1

Carbon's ox no is +4, so +4+(2*-x)= 0
x= -2

 

[Mathemagical]

Whats is the oxidation of S in CS2? The answer says —2 but i calculated myself i got +1

The oxidation state of carbon is +4, so the oxidation state of sulphur is -2.

 

[Studydayandnight]

Helpppp!!!!

Correct answer is B.

 

[Studydayandnight]

Helppp!!!!!!!!!!

Correct answer is A.

 

[Mathemagical]

Helppp!!!!!!!!!!

Correct answer is A.

In separate reactions, 4 H and Br atoms will attach themselves to the carbon atoms. 4 atoms of H and Br is equivalent to 2 molecules of H2 and Br2, so the answer is A.

 

[joeyseti]

i have problem while solving question number b iii)
your help will be much appreciated

bi) 20/1000 x 0.0200 mol/dm^3 = 4x10^-4
bii) 5 x (bi) = 2 x 10^-3
biii) 250/25 x 2x10^-3 = 0.02 mol
biv) 3.40g / 0.02 mol = 170 g/mol
bv) 151.8 + 18x = 170 , thus x = 1

CMIIW.

 

[The Sarcastic Retard]

Helpppp!!!!

Correct answer is B.

 

[princess Anu]

Can anyone help me with this question??View attachment 54389

if the ans is B..

 

[princess Anu]

why is it B? shudn't the rate of reaction increase? :/

 

[princess Anu]

why is 3 wrong?

 

[Mathemagical]

View attachment 54398 why is 3 wrong?

Magnesium oxide decomposes at 2852 degrees Celsius, far beyond the temperatures Bunsen burners can provide.

 

[Mathemagical]

why is it B? shudn't the rate of reaction increase? :/

Volume does not affect the rate of reaction, only the concentration does.

 

[Studydayandnight]

My options are different.

A. X
B. X -W
C. Y- W
D. Z- Y

I thought it'd be X, because it shows Na 2+ :/

 

[The Sarcastic Retard]

My options are different.

A. X
B. X -W
C. Y- W
D. Z- Y

I thought it'd be X, because it shows Na 2+ :/

But you saw how I did it.. Or want solution to it?

 

[Studydayandnight]

How is this C?

 

[Studydayandnight]

Only 1 is correct.

How? When ethanoic acid has only 2 carbon atoms??

 

[Studydayandnight]

But you saw how I did it.. Or want solution to it?

Yeah I did see how you did it, but it's kinda unclear

 

[The Sarcastic Retard]

Yeah I did see how you did it, but it's kinda unclear

http://sketchtoy.com/65244398

 

[Studydayandnight]

http://sketchtoy.com/65244398

Ohhhh, thanksss