Phase Change Diagrams

By POINT E, the substance is completely in the ____ phase.

• solid

• liquid

• gas

• plasma

What is the role of energy in phase changes?

• Energy is absorbed or released during phase changes, facilitating the transition between states of matter.

• Energy is only released during phase changes, never absorbed.

• Energy has no effect on phase changes.

• Energy is only involved in the solid to liquid phase change.

What is a phase change diagram?

• A graphical representation showing the states of matter (solid, liquid, gas) and the transitions between them as a function of temperature and pressure.

• A chart that displays the chemical reactions occurring in a substance.

• A visual tool used to measure the density of different states of matter.

• A diagram that illustrates the molecular structure of solids, liquids, and gases.

Beyond POINT E, the substance is still in the __________ phase, but the molecules are moving _________ as indicated by the increasing temperature.

• liquid phase, slower.

• solid phase, faster.

• gaseous phase, faster.

• plasma phase, slower.

Between minute 9 and 13, the added energy increases the ____________ of the substance.

• pressure

• volume

• temperature

• density

Describe the relationship between pressure and boiling point.

• Increasing pressure lowers the boiling point of a liquid.

• Increasing pressure raises the boiling point of a liquid.

• Pressure has no effect on the boiling point of a liquid.

• Boiling point is only affected by temperature, not pressure.

What occurs during condensation?

• A gas loses energy and transitions into a liquid.

• A liquid gains energy and transitions into a gas.

• A solid loses energy and transitions into a liquid.

• A gas gains energy and transitions into a solid.

The energy put into the substance between minutes 13 and 18 converted the substance from ___________ to ____________ state.

• solid to liquid

• liquid to gas

• gas to solid

• solid to gas

What is sublimation?

• The process where a solid changes directly into a gas without passing through the liquid phase.

• The process where a gas changes into a liquid.

• The process where a liquid changes into a solid.

• The process where a solid changes into a liquid.

Material in this phase has a __________ volume and an _______________ shape.

• definite volume and indefinite shape.

• indefinite volume and definite shape.

• definite volume and definite shape.

• indefinite volume and indefinite shape.