Question

Q16 This diagram shows a heating curve for sample of compound x


(a) Is X a solid a liquid or a gas at room temperature 200C
(b) Name the change of state which occur in region DE
(c) Explain how the curve shows that a pure sample of compound X was use​

Answer 1

Answer:

a) at 200c x will be gas

b) in region DE x changes into gaseous state

c)

Answer 2

a) liquid (I think that is 20 ) (i had 20 in my question paper)

b) solid to liquid

But with a reversible sign

I got this question in my test and i got it correct

c) It has a sharp melting and boiling point.

Have one type of particles

(It is for two marks so need to write 2 points )