Biology; Chemistry; Physics: Post your doubts here!

[AhsanAfzal]

the more carbon atoms, the more heat in organic compounds of same homologous series.

so why petrol is better than bitumen? Suchal Riaz Suchal Riaz

 

[robinhoodmustafa]

wait wait.
CaCO3 will decrease in mass-understood
CO2 will increase in mass-understood
HCl-moles will decrease, so won't the volume of HCl decrease too, causing the concentration to remain constant?

Volume remain Constant because Caco3 is itself a Limiting factor. if Cac03 runs out what will the HCL do than?

 

[robinhoodmustafa]

so why petrol is better than bitumen? Suchal Riaz Suchal Riaz

Petrol is Easily Ignited whole Bitumen will take lot heat to ignite

secondly Petrol is less viscous while bitumen is really viscous so it will Jam the Engine piston

 

[robinhoodmustafa]

how to learn the qu. on test,observation and conclusion by heart . cations and anions. plzzzzzzzzzzzzzzz helppppppppppp

http://easycaptures.com/fs/uploaded/627/3978817638.jpg

 

[AhsanAfzal]

part b. as the size of molecules increases the temperature rise done when it is burned increases or decreases? pls explain

so u mean bitumen will give more temperature rise but will also take more heat to ignite?robinhoodmustafa

 

[robinhoodmustafa]

so u mean bitumen will give more temperature rise but will also take more heat to ignite?robinhoodmustafa

Yes more Heat will be given than compared to petrol but Bitumen requires Lot of heat to burn

 

[AhsanAfzal]

are there any chemistry atp notes? robinhoodmustafa Suchal Riaz

 

[simranlalchand]

Ifa a small piece of sodium and a small piece of iron is added to separate samples of water what would be observed?

 

[AhsanAfzal]

Ifa a small piece of sodium and a small piece of iron is added to separate samples of water what would be observed?

violent reaction and sodium hydroxide with sodium and rusting with iron

 

[AhsanAfzal]

are there any chemistry atp notes? robinhoodmustafa Suchal Riaz

 

[Dawarkazi]

Guys from where can i get June 1995 chem atp?

 

[usama321]

violent reaction and sodium hydroxide with sodium and rusting with iron

Ifa a small piece of sodium and a small piece of iron is added to separate samples of water what would be observed?

nothing would be observed for iron as its reaction with water is extremely slow

 

[robinhoodmustafa]

Ifa a small piece of sodium and a small piece of iron is added to separate samples of water what would be observed?

U be doing Merchant Paper... Am I right
I just did that q

Sodium : White lilac flame, Very Vigorous reaction, metal be floating on top (Because grp 1 metal r light) and Metal oxide be seen below

Iron: It doesnot react with water so No Reaction

I am Confuse that it Iron is presence of water can get rusted so why not Iron Can react with Water?

 

[robinhoodmustafa]

Guys from where can i get June 1995 chem atp?

No Where bhai!

You Can only find it in Pastpaper Books

 

[robinhoodmustafa]

are there any chemistry atp notes? robinhoodmustafa Suchal Riaz

https://www.xtremepapers.com/community/threads/chemistry-practical-video.22606/

 

[Dawarkazi]

can anyone explain dehydration of alcohol

 

[Saad Mughal]

For those attempting ATP tomorrow, here's my portion of advice.
https://www.xtremepapers.com/community/threads/chemistry-atp-tips.25439/

 

[robinhoodmustafa]

can anyone explain dehydration of alcohol

From which chapter is that?

 

[AhsanAfzal]

U be doing Merchant Paper... Am I right
I just did that q

Sodium : White lilac flame, Very Vigorous reaction, metal be floating on top (Because grp 1 metal r light) and Metal oxide be seen below

Iron: It doesnot react with water so No Reaction

I am Confuse that it Iron is presence of water can get rusted so why not Iron Can react with Water?

in the pipette question the mark which shows 25 cm3 should be on top part. right?(in imran merchant paper)

 

[Saad Mughal]

U be doing Merchant Paper... Am I right
I just did that q

Sodium : White lilac flame, Very Vigorous reaction, metal be floating on top (Because grp 1 metal r light) and Metal oxide be seen below

Iron: It doesnot react with water so No Reaction

I am Confuse that it Iron is presence of water can get rusted so why not Iron Can react with Water?

I was thinking of the exact same thing. Iron reacts with water (and air) to form rust (brown solid).
The thing is they're only asking for the reaction with water. Iron doesn't react with water, it reacts with steam, so that's that.