Chemistry: Post your doubts here!

[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

 

[Xtreamer]

To identify SO 2 gas
http://www.gcsescience.com/itestsulphurdioxide.htm

other gases
http://www.docbrown.info/page13/ChemicalTests/ChemicalTestsg.htm

 

[Mathemagical]

Only 1 is correct.

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

Ethanoic acid forms CH3COO- ions, whereas calcium forms Ca2+ ions. Therefore, one mole of calcium ions combines with two moles of ethanoate ions.

 

[Mathemagical]

How is this C?

Radicals can be formed on the CH3 group on the far left, on the CH2 part beside it and either one of the three CH3 groups on the right.

 

[phanttasy]

need help on this!

How many moles of nitrogen,N are in 0.65mole of (NH4)2CO3? How many grams of this compound supply this much nitrogen?

 

[princess Anu]

need help on this!

How many moles of nitrogen,N are in 0.65mole of (NH4)2CO3? How many grams of this compound supply this much nitrogen?

1 mol of (NH4)2CO3 has 2 moles of nitrogen atoms so O.65 moles will have 1.3 moles of nitrogen ATOMS
and O.65* (14*2+ 8+12+16*3) = 62.4 g of this compound give us 1.3 moles of nitrogen atoms...

This is what I think.. Lets c what others say

 

[Mathemagical]

1 mol of (NH4)2CO3 has 2 moles of nitrogen atoms so O.65 moles will have 1.3 moles of nitrogen ATOMS
and O.65* (14*2+ 8+12+16*3) = 62.4 g of this compound give us 1.3 moles of nitrogen atoms...

This is what I think.. Lets c what others say

That's correct