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.

Tags

NGSS.MS-PS1-4

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

• Liquid

• Gas

• Solid

• Plasma

Tags

NGSS.MS-PS1-4

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.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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.

Tags

NGSS.MS-PS1-4

What happens to molecules as temperature and energy increase?

• Matter condenses

• Substances expand when heated

• Atoms become less active

• Phase change slows down

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Alex noticed that a metal door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms

• become smaller and take up less space.

• slow down and move closer together.

• merge together to form fewer atoms.

• speed up and move farther apart.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

• Gas

• Vapor

• Solid

• Liquid

Tags

NGSS.MS-PS1-4

When a gas begins to condense through condensation, what happens to the heat in the particles.

• The heat leaves the gas as it condenses.

• The heat goes into the gas as it condenses.

• The heat stays the same as it condenses.

• None of the above.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

• tree

• ice

• water

• oxygen

• oil