The graph shows the changes in the phase of ice when it is heated.

A graph is plotted with temperature in degree Celsius on the y axis and Time in minutes on the x axis. The temperature at time 0 minute is labeled A, the temperature at time 2 minutes is labeled B, the temperature at time 25 minutes is labeled C, the temperature at time 80 is labeled D. Graph consists of five parts consisting of straight lines. The first straight line joins points 0, A and 2, B. The second straight line is a horizontal line joining 2, B and 12, B. Third straight line joins 12, B and 25, C. Fourth straight line is a horizontal line which joins 25, C and 80, C. Fifth straight line joins 78, C and 80, D.

Which of the following temperatures describes the value of C? (5 points)
100 °C, because it is the melting point of ice.
100 °C, because it is the boiling point of water.
Less than 100 °C, because C represents the temperature at which ice melts.
Less than 100 °C, because C represents the temperature at which water evaporates.

Question

06-03-2022
Chemistry

Answered

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The graph shows the changes in the phase of ice when it is heated.

A graph is plotted with temperature in degree Celsius on the y axis and Time in minutes on the x axis. The temperature at time 0 minute is labeled A, the temperature at time 2 minutes is labeled B, the temperature at time 25 minutes is labeled C, the temperature at time 80 is labeled D. Graph consists of five parts consisting of straight lines. The first straight line joins points 0, A and 2, B. The second straight line is a horizontal line joining 2, B and 12, B. Third straight line joins 12, B and 25, C. Fourth straight line is a horizontal line which joins 25, C and 80, C. Fifth straight line joins 78, C and 80, D.

Which of the following temperatures describes the value of C? (5 points)
100 °C, because it is the melting point of ice.
100 °C, because it is the boiling point of water.
Less than 100 °C, because C represents the temperature at which ice melts.
Less than 100 °C, because C represents the temperature at which water evaporates.

Sagot :

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The temperatures describing the value of C is 100 °C, because it is the boiling point of water.Hence, The correct answer is Option (B)

What is Phase change ?

A phase change is when matter changes to from one state (solid, liquid, gas, plasma) to another.

These changes occur when sufficient energy is supplied to the b(or a sufficient amount is lost), and also occur when the pressure on the system is changed.

The given heating curve has two flat lines (Or plateaus) ;

The first one is the melting point,

The second one is the boiling point.

(Image is attached for reference)

In the given problem, C is the second flat line, so it is boiling point.

Therefore , The temperatures describing the value of C is 100 °C, because it is the boiling point of water.Hence, The correct bis Option (B)

Learn more about Phase change here ;

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Sagot :

What is Phase change ?

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