Biology; Chemistry; Physics: Post your doubts here!

[exploded diper]

Which question. I already answered 2 different people today regarding this

that if we increase the concentration the graph wpuold be higher and steeper since there are more moles and faster reaction
and if in a reaction u decrease the volume and increase the concentration by the same amount the the graph height will be same but steeper since the the no. of moles remain same and but the reaction is faster ... am i right?

 

[Dark Destination]

Why do I miss the alerts? :/

Because if you don't check once, it stops giving alerts for each post.

 

[funky brat]

In the KMnO4 titrations, what is the color change at end point?
When Iron (II) Sulfate is titrated with KMnO4.

Also, why is Sulfuric acid used in the Electrolysis of water? :/

And, what are the colors of common metals and compounds we should know?

And to how many significant figures should we round our moles answers, in the titration question?

And lastly, how to draw a graph properly?

It is from purple to clourless.
Water itself cannot be used as an electrolyte unless it's impure. So the electrolysis of H2SO4 is actually the electrolysis of water.
3 singificant figures
Graphs here are simple, at least Physics se better.

 

[funky brat]

so if we increase concentration , temperature, catalyst, the graph is steeper
and if we increase volume the volume of gas is more so graph is higher..
if we increase concentration does the volume of gas also increases so graph is both steeper and higher ?
and if we decrease volume and increase concentration the graph is steeper but at the same height ....
am i correct????

Increasing the catalyst does not increase the rate of reaction.
Yes.
Yeah both.
Yes.

 

[princess Anu]

It says increasing the conc of sodium carbonate 10 times

What does the marking scheme say?

 

[funky brat]

so if we increase concentration , temperature, catalyst, the graph is steeper -- Yes
and if we increase volume the volume of gas is more so graph is higher.. -- Yes

if we increase concentration does the volume of gas also increases so graph is both steeper and higher ? -- Steeper only
and if we decrease volume and increase concentration the graph is steeper but at the same height ....-- Less height
am i correct????

This is exactly what I said earlier but then I edited my answer. Dark Destination you said when concentration increases moles increase so vloume of gas given off increase too, Are you sure?

 

[Dark Destination]

This is exactly what I said earlier but then I edited my answer. Dark Destination you said when concentration increases moles increase so vloume of gas given off increase too, Are you sure?

Yeah

 

[Dark Destination]

Chemistry

 

[funky brat]

Chemistry

You don't say.

 

[exploded diper]

Increasing the catalyst does not increase the rate of reaction.
Yes.
Yeah both.
Yes.

increasing a catalyst does increase rate of rection....this i am pretty sure...

 

[Dark Destination]

You don't say.

Will the paper be easy?

 

[funky brat]

Will the paper be easy?

I believe.

 

[funky brat]

increasing a catalyst does increase rate of rection....this i am pretty sure...

It does? Are you sure?

 

[Dark Destination]

CHEMISTRY! *sigh*

 

[exploded diper]

It does? Are you sure?

Yes it does.......vat else do u use a catalyst for?.......

 

[Maganius]

How can we determine the color change in Titration question? Anyone?

 

[exploded diper]

It increases the rate of reaction by decreasing the activation energy......however it does not have any effect on the equilibrium......as it will increase the rate of both sided reactions.....

It does? Are you sure?

 

[Maganius]

I believe.

Increasing the mass of catalyst per se, does not increase reaction rate. Reaction rate is increased mainly through increasing the surface area of the catalyst. If you keep the mass of catalyst constant and mechanically alter its shape you can:
1) if you reduce the surface area, reduce reaction rate
2) If you increase the surface area, increase the reaction rate.

You cannot make the broad claim that reaction rate is affected by mass of catalyst. This is not technically correct.

That's what I believe.

 

[***amd***]

Explain please.
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_w09_qp_4.pdf question 6.
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s11_qp_42.pdf question 6.
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Chemistry (5070)/5070_s09_qp_4.pdf question 4.

chem master ko kiya ho gya?

 

[funky brat]

chem master ko kiya ho gya?

Kuch nahi. Fazool main confuse ho rahi thy.
Main chemistry master nahi hun.