Chemistry: Post your doubts here!

[A*****]

statement 2 also have a long hydrocarbon chain which is more flammable.
Thus provide no use as a fire extinguisher.

What about 3?

 

[Hamnah Zahoor]

What about 3?

Only bromine containing compounds and carbondioxide are used as fire extinguishers.
Acids are not used.

 

[IN NEED OF HELP]

In an experiment, 12.0dm3 of oxygen, measured under room conditions, is used to burn completely 0.10mol of propan-1-ol. What is the final volume of gas, measured under room conditions? A 7.20dm3 B 8.40dm3 C 16.8dm3 D 18.00dm3 ans is B. Pls explain how

 

[A*****]

In an experiment, 12.0dm3 of oxygen, measured under room conditions, is used to burn completely 0.10mol of propan-1-ol. What is the final volume of gas, measured under room conditions? A 7.20dm3 B 8.40dm3 C 16.8dm3 D 18.00dm3 ans is B. Pls explain how

 

[Kanekii]

Is the boiling point of a compound directly proportional to percentage of carbon in the compound?
how to find sigma and pi bonds and what are they?

 

[SohaibButt]

Someone pls help it's ans is B y not D?

 

[Ebrahim12]

Which fertilisers, when washed out of soil by rain, cause excessive growth of river plants and
algae with the result that fish in the river die?
1 K2SO 4
2 NH4NO 3
3 NaNO3

Only 2 and 3 are correct. Won't the K+ ions in 1 also cause excessive growth in plants?

 

[A*****]

Someone pls help it's ans is B y not D?View attachment 64008

Was going to ask the same!!

 

[A*****]

Is the boiling point of a compound directly proportional to percentage of carbon in the compound?

Never heard of that

how to find sigma and pi bonds and what are they?

Sigma bond is the single bond formed due to overlap of orbitals....pie is formed by the sideways overlap of p orbitals

 

[A*****]

Which fertilisers, when washed out of soil by rain, cause excessive growth of river plants and
algae with the result that fish in the river die?
1 K2SO 4
2 NH4NO 3
3 NaNO3

Only 2 and 3 are correct. Won't the K+ ions in 1 also cause excessive growth in plants?

Is it used as a fertilizer?

 

[Hamnah Zahoor]

Someone pls help it's ans is B y not D?View attachment 64008

Was going to ask the same!!

Well I suppose when we studied about molecules possessing energy we know that it is not the case that a very large number of molecules possess very low energy or very high energy I mean the peak of the graph never shifts to the far left or right in case of showing energy. Most molecule posses average energy thus option D is incorrect.
In option B at high temperature peak lowered showing the correct graph.

 

[Hamnah Zahoor]

Is it used as a fertilizer?

Well yes it is used as a fertilizer
The dominant use of potassium sulfate is as a fertilizer. K2SO4
But I am also not able to figure out why it is not involved in eutrophication.
Well It is also soluble in water.

 

[A*****]

Well I suppose when we studied about molecules possessing energy we know that it is not the case that a very large number of molecules possess very low energy or very high energy I mean the peak of the graph never shifts to the far left or right in case of showing energy. Most molecule posses average energy thus option D is incorrect.
In option B at high temperature peak lowered showing the correct graph.

but the peak is at almost the same energy level...I mean it is not shifted to the right

 

[SohaibButt]

For the same plane angle must not be 120? Here it is B but propane forms 109.5

 

[Hisham Khan]

Someone pls help it's ans is B y not D?View attachment 64008[/QUOTE}

It has to be D check again

 

[SohaibButt]

It has to be D check again

I checked it's B

 

[Hisham Khan]

I checked it's B

My teacher said it's D lol

 

[SohaibButt]

My teacher said it's D lol

She is not marking scheme

 

[Hisham Khan]

She is not marking scheme

He was a examiner in the practicals but yes we all are humans

 

[SohaibButt]

He was a examiner in the practicals but yes we all are humans

Yup man explain now! He must have given reason