coconut64
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http://www.ocr.org.uk/Images/171755-...-materials.pdf

For Q2 the answer is C ( C The bonds between the ammonia molecules are weak). Can someone explain as this is very vague answer. What bond is thing referring to ?

Also for 10b) why is the answer c?

Thanks
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username986184
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(Original post by coconut64)
http://www.ocr.org.uk/Images/171755-...-materials.pdf

For Q2 the answer is C ( C The bonds between the ammonia molecules are weak). Can someone explain as this is very vague answer. What bond is thing referring to ?
Intermolecular


(Original post by coconut64)
Also for 10b) why is the answer c?
Write out the equation. Look at the stoichiometry. One of the reactants is in excess.
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coconut64
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(Original post by TeachChemistry)
Intermolecular




Write out the equation. Look at the stoichiometry. One of the reactants is in excess.
For q2 why is the intermolecular forces bewteen the molecules considered rather than the bonds within the molecule for the boiling point?

For 10b) the ratio is 1:3 : 2 I am still unsure as I have used this info and did 500/2 to give me 250 cm^3 as there are two moles of ammonia. Thanks
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coconut64
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help???
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username986184
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(Original post by coconut64)
help???
Let's deal with Q2.

When water boils, for example, which bonds break during the liquid to gas transition?
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coconut64
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(Original post by TeachChemistry)
Let's deal with Q2.

When water boils, for example, which bonds break during the liquid to gas transition?
Hydrogen bonds?
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(Original post by coconut64)
Hydrogen bonds?
Exactly - the intermolecular bonds. The bonds between molecules. And so it is with ammonia.

So the answer is C. It can't be A because that is not true. B is true but so what - it has no relevance to the question. D is true but these bonds have nothing to do with state.

A
The bonds between the nitrogen and hydrogen atoms in ammonia are weak.

B
Nitrogen and hydrogen have very low boiling points.

C
The bonds between the ammonia molecules are weak.

D
Ammonia is covalently bonded
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coconut64
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(Original post by TeachChemistry)
Exactly - the intermolecular bonds. The bonds between molecules. And so it is with ammonia.

So the answer is C. It can't be A because that is not true. B is true but so what - it has no relevance to the question. D is true but these bonds have nothing to do with state.

A
The bonds between the nitrogen and hydrogen atoms in ammonia are weak.

B
Nitrogen and hydrogen have very low boiling points.

C
The bonds between the ammonia molecules are weak.

D
Ammonia is covalently bonded
Why do they call the IMF between the ammonia molecules 'bonds' , aren't they intermolecular forces though? Thanks Also can you explain 10b?
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(Original post by coconut64)
Why do they call the IMF between the ammonia molecules 'bonds' , aren't they intermolecular forces though? Thanks Also can you explain 10b?
the terms bonds and forces are synonymous in this situation. I am surprised you have not heard this before.
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(Original post by coconut64)
Also can you explain 10b?
Look at the Haber process balanced equation and answer the following. What is the MAXIMUM volume of N2 that can react with 300 cm3 of H2?
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(Original post by TeachChemistry)
the terms bonds and forces are synonymous in this situation. I am surprised you have not heard this before.
I was taught that they are simply called intermolecular forces. Bonds are within the molecule that what I learnt. Please could you explain 10b? thanks
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(Original post by coconut64)
I was taught that they are simply called intermolecular forces. Bonds are within the molecule that what I learnt.
But you just used the term hydrogen bonds. Why did you not call these 'hydrogen intermolecular forces'?
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(Original post by TeachChemistry)
Look at the Haber process balanced equation and answer the following. What is the MAXIMUM volume of N2 that can react with 300 cm3 of H2?
So only 100 cm3 of N2 will react. And if there are 2 moles of ammonia, surely it will be 100+300 then half of the total , giving 200?
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(Original post by coconut64)
So only 100 cm3 of N2 will react. And if there are 2 moles of ammonia, surely it will be 100+300 then half of the total , giving 200?
And what about the unreacted nitrogen?
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(Original post by TeachChemistry)
And what about the unreacted nitrogen?

Thanks for the help, I really appreciate it. I have got other questions as well if you don't mind helping. Many thanks.
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(Original post by coconut64)
Thanks for the help, I really appreciate it. I have got other questions as well if you don't mind helping. Many thanks.
Does that mean you understand 10b now?
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(Original post by TeachChemistry)
Does that mean you understand 10b now?
Yes, because the question is not asking you the volume of the final product but instead the volume of everything left over after the reaction. Since there is some unreacted ammonia, the total adds up to 300
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(Original post by coconut64)
Yes, because the question is not asking you the volume of the final product but instead the volume of everything left over after the reaction. Since there is some unreacted ammonia, the total adds up to 300
Exam tip. Check your answer.
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