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sergey [27]
3 years ago
15

If this abudullah kid answers I will report you

Chemistry
1 answer:
Scilla [17]3 years ago
3 0

Explanation:

a. The melting point is at 20C and the boiling point is at 80C. The melting point is when a solid is going through a phase change to become a liquid, that is the 1st plateau in the graph. The boiling point is when the liquid is going through vaporization to become a gas. That is the second plateau.

b. At 30C, it is a liquid, since our melting point is at 20C.

c. The substance before 20C is a solid, as we add energy, it will melt and become a liquid.

The graph is different for each substance but in this same configuration where a change in the graph is a different phase or a phase change.

Where that first incline = solid

1st plateau= melting or freezing

2nd incline= liquid

2nd plateau= vaporization or condensation

3rd incline= gas

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