Biology; Chemistry; Physics: Post your doubts here!

[$$AK$$]

Back to work

ur right.
start a new page and study hard

 

[Mohammad Mishal]

some of use urdu, but it can be a problem for others like me. so can we keep the postings to English please

 

[Saad Mughal]

some of use urdu, but it can be a problem for others like me. so can we keep the postings to English please

Well, if someone doesn't understand. Just ask us to translate.
We would never use Urdu for answering questions. It's solely for conversation purposes SOMETIMES.

 

[zohra`xo]

Two different hydrocarbons each contain the same percentage by mass of hydrogen.
It follows that they have the same
A empirical formula.
B number of isomers.
C relative molecular mass.
D structural formula.

 

[starship]

I try.

This too please

 

[usama321]

Two different hydrocarbons each contain the same percentage by mass of hydrogen.
It follows that they have the same
A empirical formula.
B number of isomers.
C relative molecular mass.
D structural formula.

empirical formula. The reasoning being that as it is a hydrocarbon, it contains only carbon and hydrogen.. so if hydrogen percentage is same, then carbon percentage is same too

 

[zohra`xo]

empirical formula. The reasoning being that as it is a hydrocarbon, it contains only carbon and hydrogen.. so if hydrogen percentage is same, then carbon percentage is same too

Ohh okay.
I was thinking like, C2H6 and C3H6 - that they have the same amount of H and they can't have same emp form.

 

[usama321]

Ohh okay.
I was thinking like, C2H6 and C3H6 - that they have the same amount of H and they can't have same emp form.

the percentage of H is not the same in both of them

 

[usama321]

This too please View attachment 26750

measure the resultant length, multiply with the scale, which is already the same. you have got your answer

 

[Ahmed Zaib]

Hey people. Hope I am welcomed in. Got a quesion, if we have to produce ammonia, we usually react an ammonium salt with a base.. Can anybody explain me what happens in the reaction?
And also, why Pottasium Nitrate preffered over Ammonium Phosphate for increasing the nitrogen content in soil. That is as a fertilizer.
Hoping for answers.
Merci Beacoup.

 

[usama321]

Hey people. Hope I am welcomed in. Got a quesion, if we have to produce ammonia, we usually react an ammonium salt with a base.. Can anybody explain me what happens in the reaction?
And also, why Pottasium Nitrate preffered over Ammonium Phosphate for increasing the nitrogen content in soil. That is as a fertilizer.
Hoping for answers.
Merci Beacoup.

Welcome
When ammonium salt reacts with a base, the product is usually a salt, water and ammonia

nitrates are preferred perhaps because if you add ammonium, you can't add bases, otherwise the Nitrogen is lost in the form of NH3 given off by the ammonium base reaction

 

[Ahmed Zaib]

Thankyou so much man THat was such great help

 

[Hskk]

The drawing's really really pathetic. I'm no good at paint. I know sorry.
I hope you get the concept.
P.S. I switched one of the arrows accidentally too.

View attachment 26746

I got this q in my mock exam and I drew an eye myself because that's how I knew to make ray diagrams. Is that okay? My teacher gave me all of the marks. Which year is it btw, I wanna check the ms.

 

[Hskk]

View attachment 26754

measure the resultant length, multiply with the scale, which is already the same. you have got your answer

Which angle do you consider the direction of the resultant?

 

[Young Stunner]

What does this mean. Position of equilibrium moves to right?

 

[Suchal Riaz]

Which angle do you consider the direction of the resultant?

Write bearing from north, of Ngle from any other force. For example 25 degree from AB

 

[Suchal Riaz]

What does this mean. Position of equilibrium moves to right?

The products at right are produced more than products at left

 

[Saad Mughal]

I got this q in my mock exam and I drew an eye myself because that's how I knew to make ray diagrams. Is that okay? My teacher gave me all of the marks. Which year is it btw, I wanna check the ms.

Don't know about the year.
But it's correct to make the eye. No penalties for that.

 

[Suchal Riaz]

Don't know about the year.
But it's correct to make the eye. No penalties for that.

What else can we make other than eye

 

[Saad Mughal]

What else can we make other than eye

They tell us to draw the image of X. We can directly draw rays from X, reflect them, trace them back to find the image. No need for eye.