Phase Changes

What is an example of a chemical change?

• Wood burning, which produces ash and gases.

• Water boiling to form steam.

• Ice melting into water.

• Sugar dissolving in water.

What is evaporation?

• Evaporation is the process where a liquid turns into a gas when heat is added.

• Evaporation is the process where a gas turns into a liquid when cooled.

• Evaporation is the process of a solid turning into a liquid when heated.

• Evaporation is the process of a liquid turning into a solid when heat is removed.

What is sublimation?

• A process where a liquid turns into a solid.

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

• A process where a gas turns into a liquid.

• A process where a solid turns into a liquid.

What is melting?

• Melting is the process where a solid turns into a liquid when heat is added.

• Melting is the process where a liquid turns into a gas when heat is added.

• Melting is the process where a solid becomes a gas without turning into a liquid.

• Melting is the process where a liquid turns into a solid when heat is removed.

What is an example of a physical change?

• Ice melting into water.

• Burning wood to ash.

• Rust forming on iron.

• Mixing sand and salt.

What is the significance of the melting point?

• It is the temperature at which a solid becomes a liquid, and it is a characteristic property of a substance.

• It is the temperature at which a liquid becomes a gas.

• It is the temperature at which a gas condenses into a liquid.

• It is the temperature at which a solid dissolves in a liquid.

What is freezing?

• Freezing is the process where a liquid turns into a solid when heat is removed.

• Freezing is the process where a solid turns into a liquid when heat is added.

• Freezing is the process of turning a gas into a liquid by cooling.

• Freezing is the process of evaporating a liquid into a gas.

What happens to the temperature of a substance during a phase change?

• The temperature of a substance increases continuously during a phase change.

• The temperature of a substance decreases continuously during a phase change.

• The temperature of a substance remains constant during a phase change, even though heat energy is being added or removed.

• The temperature of a substance fluctuates randomly during a phase change.

What are the main types of phase changes?

• Melting, freezing, condensation, evaporation, sublimation, and deposition

• Dissolution, crystallization, precipitation, and filtration

• Sublimation, condensation, filtration, and evaporation

• Melting, boiling, freezing, and condensation

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 remains in the same state but changes its shape.

• A chemical reaction that alters the composition of a substance.

• A phenomenon that occurs only at absolute zero temperature.