Can't solve this chem problem. Could you guys help me plz?

Watch
Diana Heo
Badges: 0
Rep:
?
#1
Report Thread starter 5 years ago
#1
The problem is from the text book 'Chemistry for Cambridge IGCSE' and on page 11 question 3.

Q: Oxygen is the gas we breathe in. It can be separated from the air. It boils at -219ºC and freezes at -183ºC.
In which state is oxygen, at: 0ºC? -200ºC?



But what I wonder is that can the boiling point be lower than the melting point ?
In addition, the original boiling point of oxygen is -183ºC and the original melting point of oxygen is -219ºC.
What's the matter with that question? or Am I stupid?
Could anyone solve this please?
0
reply
Diana Heo
Badges: 0
Rep:
?
#2
Report Thread starter 5 years ago
#2
The question is from a text book 'Chemistry for Cambridge IGCSE' and on page 11 question 3.

Q : Oxygen is the gas we breathe in. It can be separated from the air. It boils at -219ºC and freezes at -183ºC.
In which state is oxygen, at: 0ºC? -200ºC?

But what I wonder is that can the boiling point be lower than the melting point?
In addition, according to the truths of science, the boiling point of oxygen is -183ºC , not -219ºC. And its melting point is -219ºC, not -183ºC.
What's the matter with this question? or Am I stupid?

Could anybody solve this please?
0
reply
Nessie162
Badges: 17
Rep:
?
#3
Report 5 years ago
#3
It's the other way around. Freezing point is -219 and boiling point is -183
2
reply
DougallnDougall
Badges: 13
Rep:
?
#4
Report 5 years ago
#4
0C - liquid
-200C - somewhere between liquid and solid?
The textbook has the boiling and freezing points wrong way round.

PS - don't take my word for it coz I've never studied chemistry 😜😂😂😂
1
reply
Little Tail Chaser
Badges: 19
Rep:
?
#5
Report 5 years ago
#5
It's a typo, it freezes/melts at -218.4°C and boils/condenses at -183.0°C according to here

You're right that the boiling point can't be lower than the melting point, you're not stupid at all!
1
reply
Diana Heo
Badges: 0
Rep:
?
#6
Report Thread starter 5 years ago
#6
(Original post by Nessie162)
It's the other way around. Freezing point is -219 and boiling point is -183
Then, the answer would be ' Oxygen is still gas at 0ºC.Oxygen turns into liquid at -200ºC.'
Is this right ?
0
reply
Diana Heo
Badges: 0
Rep:
?
#7
Report Thread starter 5 years ago
#7
(Original post by Little Tail Chaser)
It's a typo, it freezes/melts at -218.4°C and boils/condenses at -183.0°C according to here

You're right that the boiling point can't be lower than the melting point, you're not stupid at all!
Thank you sooooo much
0
reply
Diana Heo
Badges: 0
Rep:
?
#8
Report Thread starter 5 years ago
#8
(Original post by DougallnDougall)
0C - liquid
-200C - somewhere between liquid and solid?
The textbook has the boiling and freezing points wrong way round.

PS - don't take my word for it coz I've never studied chemistry 😜😂😂😂

Thanx for your reply
0
reply
DougallnDougall
Badges: 13
Rep:
?
#9
Report 5 years ago
#9
(Original post by Diana Heo)
Thanx for your reply
You're welcome but honestly I wouldn't go with my answer unless quite desperate 🙈 Not sure how I even came to know that Oxygen can be boiled and frozen 😕😊
0
reply
Little Tail Chaser
Badges: 19
Rep:
?
#10
Report 5 years ago
#10
(Original post by Diana Heo)
Then, the answer would be ' Oxygen is still gas at 0ºC.Oxygen turns into liquid at -200ºC.'
Is this right ?
You're correct about it being a gas and a liquid. It won't be 'in between' the two states as suggested above. Pure elements change state at or very close to their boiling/meting points.
0
reply
Rather_Cynical
Badges: 11
Rep:
?
#11
Report 5 years ago
#11
There is some exceptions to the "in between states" comment, but definitely won't be taught in the GCSE syllabus.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How do you prefer to get careers advice?

I like to speak to my friends and family (12)
11.01%
I like to do my own research online using careers specific websites (72)
66.06%
I like speaking to the careers advisors at school, college or uni (14)
12.84%
I prefer to listen watch videos or listen to podcasts of people in my chosen career (9)
8.26%
Something else (let us know in the thread) (2)
1.83%

Watched Threads

View All