Phase Changes

Suppose you pour a glass of ice water and set it on the kitchen table. After a few minutes, the outside of the glass will be covered with drops of water. Why did this happen?

• Oxygen in the air cooled and condensed onto the cold glass.

• Water vapor in the air cooled and condensed onto the cold glass.

• Water vapor in the air cooled and evaporated onto the cold glass.

• Water seeped through pores in the glass.

A substance is able to flow freely within a container. What state of matter is the substance in?

• Liquid

• Gas

• Solid

• Plasma

What are the characteristics of a solid?

• Solids do not have a definite shape but have a definite volume

• Solids have a definite shape and no definite volume

• Solids do not have a definite shape and no definite volume

• Solids have a definite shape and definite volume

Why do atoms in a solid still vibrate?

• All solids have some thermal energy.

• Some solids have some thermal energy, and some do not.

• Atoms in a solid do not vibrate.

• None of the above.

When heat is added to a liquid, what occurs?

• Liquid molecules begin to condense to form a solid.

• Liquid molecules are being slowed down to become a gas.

• Liquid molecules speed up and begin to spread out to become a gas.

• Liquid molecules begin to slow down to become a solid.

When heat energy and temperature are at their lowest, what state of matter is a substance in?

• Gas

• Vapor

• Solid

• Liquid

Which of the following is an example of a liquid (select ALL that apply).

• tree

• ice

• water

• oxygen

• oil

Is the substance gaining or losing energy?

• Gaining

• Losing

Are the particles moving faster or slower as time goes on?

• Faster

• Slower

What state/phase is the object likely from points A to B?

• Solid

• Liquid

• Gas

• Plasma