Question

An unknown substance is heated from 10 °C to 25 °C. The table below shows the state of the substance at different temperatures.


Time
(minutes) Temperature of liquid
(degrees Celsius) State of matter
0 10 Solid
2 15 Solid
4 17
6 17
8 17
10 23 Liquid
12 25 Liquid

Which statement is correct about the unknown substance?


Its melting point is 17 °C.

Its melting point is 15 °C.

The substance sublimes at 15 °C.

The substance exists as a gas at 17 °C.


(This is science)

Answer 1

Answer:

Its melting point is 17 °C.

Explanation:

• The melting point of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium.

So, the melting point is 17 °C.

And this is shown in the figure attached.

Answer 2

Answer:

A

Explanation: this is science and I'm like dis guy