e.g. the melting point of hydrogen sulphide Is -85 degrees and its boiling point is -61 degrees.


Anything below its melting point is a solid.
Anything above its melting point and below its boiling point is a liquid
Anything above it boiling point is a gas
25 degrees is above the boiling point (which is -61 degrees)
So this must be a.........

Tabitha Farrant

hello my name is Amantle Duta in Botswana .... and um asking for your help on Physics.


In boiling, most or all of the molecules in the liquid have enough energy to leave the liquid and become gas. The whole liquid will be near or at the boiling temperature.
In evaporation, the liquid will normally be much cooler than boiling temperature. However, because of the way that molecules pass energy from one to another (Brownian Motion), not all the molecules will have the SAME energy. In fact, some will have lots more than others. These very energetic molecules, if they are near to the edge of the liquid, may have enough energy to escape from the liquid and become gas. The process of molecules leaving will gradually mean that the liquid all evaporates away.
Hope that helps

Tabitha Farrant
By Shekinah Alornyeku

Are there any art GCSE questions or help or anything on this site?


Sorry - no GCSE questions here - but did you know that you can download ALL past paper questions and mark schemes FOR FREE at the relevant exam board websites? Check with your teacher what exam specification you are studying as they are changing and I may not have got the right links below.
AQA - http://www.aqa.org.uk/subjects/art-and-design/gcse/art-and-design-4200
OCR - http://www.ocr.org.uk/qualifications/gcse-art-and-design-suite-j160-j167...
Edexcel (Pearsons) https://qualifications.pearson.com/en/qualifications/edexcel-gcses/art-a...
Good luck

Tabitha Farrant
By elliott heath

An alkali is a compound with particular chemical properties including turning litmus blue and neutralizing acids
An alkali has a pH of more than 7

Tabitha Farrant
When do you normally start revising for exams?
Day before
Week Before
Up to a month before
Up to three months before
Up to six months before
I revise all year
Total votes: 7449