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An unknown substance is cooled from 25 °C to 10 °C. The table below shows the state of the substance at different temperatures.
Time (minutes) Temperature (degrees Celsius) State of matter 0 25 Liquid 2 23 Liquid 4 18 6 18 8 18 10 15 Solid 12 10 Solid

Which statement is correct about the unknown substance?
Its freezing point is 23 °C.
Its freezing point is 18 °C.
The substance sublimes at 23 °C.
The substance exists as a gas at 18 °C.

Respuesta :

The second statment is true and right. Hope this helps!!

Answer: Option (b) is the correct answer.

Explanation:

Freezing point is defined as the point at which liquid state of a substance changes into solid state.

So, in the given table it is shown that at temperature [tex]18^{o}C[/tex] the substance is changing into solid state. Whereas at [tex]23^{o}C[/tex] the substance is in liquid state.

Hence, [tex]18^{o}C[/tex] will be the freezing point of the substance.

Thus, we can conclude that the statement its freezing point is [tex]18^{o}C[/tex], is correct about the unknown substance.

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