Phase Changes

Phase Changes

by Jeanette Rodriguez

​Water's heating Curve

​From -40 degrees to 0 degrees energy is being added to water and it is still a solid all that time as the temperature continues to rise.

​As it reaches 0 degrees Celsius, the energy is now going towards breaking the intermolecular forces, change of state then takes place.

​During this time, the temperature remains constant and you have solid and liquid present until all of the solid is melted completely.

​Melting

​From point B to C the ice is melting, during this time the temperature remains constant and there is a solid and liquid mixture until all the solid is melted. At that point the temperature will begin to rise until it reaches the boiling point.

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​Once all the ice is melted, the temperature of the liquid water starts to rise. That takes place from point C to point D. You only have liquid water throughout those two points.

​When the temperature reaches 100 degrees celsius (boiling point) temperature remains constant and the phase change begins to take place. You'll find both liquid and gas from point D to E.

Multiple Choice

Particles of a substance at a warmer temperature have more thermal energy than that same substance at a cooler temperature.

• True

• False

Multiple Choice

What happens to the particles of a liquid as they lose energy?

• The particles move at the same rate.

• The particles move slower

• The particles move more rapidly.

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Multiple Choice

The change of state from a liquid to a gas is called _________.

• condensation

• sublimation

• vaporization

Multiple Choice

During _____ water vaporizes only at the surface.

• evaporation

• boiling

• condensation

Multiple Choice

8 During ________, water vaporizes below the surface of a liquid.

• evaporation

• condensation

• boiling

Multiple Choice

Chemists use boiling points to help identify unknown substances.

• True

• False

Multiple Choice

Water freezes at ______o C.

• 0

• 100

• 180

Multiple Choice

Water boils at ______o C.

• 0

• 100

• 180

Multiple Choice

Which of these temperatures would fit a sample of liquid water?

• 85o C

• 110o C

• -34o C

• 0 o C

Multiple Choice

Which of these temperatures would fit a sample of water vapor?

• 85o C

• 110o C

• -34o C

• 0 o C

Multiple Choice

If Aluminum's melting point is 660°C and its boiling point is 2519°C, identify its state of matter at room temperature.

• solid

• liquid

• gas

Multiple Choice

If Flourine's melting point is -220° C and its boiling point is -188° C, what state is it at room temperature?

• solid

• liquid

• gas

Multiple Choice

Mercury has a melting point of -39° C. Its boiling point is 357° C. What state is Mercury at room temperature?

• solid

• liquid

• gas