March 26, 2015

Homework Help: Chemistry

Posted by Fiona on Tuesday, January 18, 2011 at 10:49am.

I have a couple of questions I need a hand with:

1. Oxygen has a melting point of -218 degrees celcius and a boiling point of -183 degrees celcius. This means that oxygen would be a liquid at...?
Please do not tell me the answer, but tell me the relation between the melting point and boiling point and HOW i can use it to determine when a substance is liquid. Feel free to give me examples.

2. When a substance absorbs heat from its surroundings it could:
A) condense or melt.
B) solidify or condense.
C) evaporate or condense.
D) evaporate or melt.
I'm guessing it is 'evaporate or melt'? Correct me if I am wrong, along with an explanation.

3. When wax melts, the wax particles:
A) change shape to fit the surface they are on.
B) gain energy and spread out alot.
C) become softer.
D) Gain energy and move more freely.
I'm caught between B) and D).. but leaning towards D) more. Again, any explanations would be great!

Thank you very much.

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