Phase Changes & Properties of Matter

What are the three main states of matter?

• Solid, liquid, and gas

• Solid, liquid, and plasma

• Solid, gas, and vapor

• Liquid, gas, and steam

What is a phase change?

• A transition of matter from one state to another due to changes in energy and temperature.

• A process where matter loses its mass.

• A chemical reaction that alters the molecular structure of a substance.

• A phenomenon that occurs only at absolute zero.

What occurs at the melting point of a substance?

• The substance completely vaporizes.

• The solid and liquid phases coexist in equilibrium.

• The substance becomes a gas immediately.

• The temperature of the substance decreases.

What is condensation?

• A phase change where a liquid turns into a gas as energy is added.

• A phase change where a gas turns into a liquid as energy is removed.

• A process where solid turns directly into gas without becoming liquid.

• A chemical reaction that produces gas from liquid.

What is the significance of the phase change diagram?

• It visually represents the states of matter and the energy changes during phase transitions.

• It shows the chemical reactions that occur during phase changes.

• It illustrates the temperature changes in a chemical reaction.

• It provides a historical overview of phase change theories.

What is an example of a phase change from gas to liquid?

• Water vapor condensing into liquid water.

• Ice melting into water.

• Liquid water evaporating into steam.

• Steam freezing into ice.

What is the relationship between energy and phase changes?

• Energy must be added or removed for phase changes to occur; adding energy can cause melting or boiling, while removing energy can cause freezing or condensation.

• Phase changes occur without any energy change.

• Energy is only required for melting, not for freezing.

• Phase changes are independent of energy changes.

How does temperature affect particle motion?

• As temperature increases, particle motion decreases.

• As temperature increases, particle motion (kinetic energy) increases; as temperature decreases, particle motion decreases.

• Temperature has no effect on particle motion.

• As temperature decreases, particle motion increases.

What is boiling (vaporization)?

• The process of a solid turning into a liquid as heat is applied.

• The phase change where a liquid turns into a gas as energy is added.

• The transformation of a gas into a liquid when cooled.

• The process of a liquid becoming a solid when temperature decreases.

What happens to the temperature during a phase change?

• The temperature increases as the substance changes state.

• The temperature decreases as the substance changes state.

• The temperature remains constant while the substance changes state.

• The temperature fluctuates during the phase change.