If a gas changes directly to a solid without first becoming a liquid, the gas undergoes _______.

What is it called when thermal energy is added and matter changes from a solid to a liquid?

What is an example of freezing?

When one substance evenly mixes with another substance it called _______

Sometimes, when energy is added to a solid, it undergoes ________, in which it changes directly from a solid to a gas without first becoming a liquid.

When enough energy is added to a solid for it to change to a liquid, the solid has reached its ________.

When enough energy is added to a liquid for it to change to a gas, the liquid has reached its ________.

When thermal energy is added to particles, they move _____ and temperature _______.

The energy of particles changes when ________ is added or removed.

A change in state involves a change in the _____ of the particles.

____________ the matter’s identity stays the same.

A physical change involves a change in size, shape, form, or state.

Mass is different after a physical change.

Which never changes after a physical change?

Examine the graph of the temperature over time as a substance changes from solid to liquid to gas. Explain why the graph has horizontal lines.

Rodney tears a piece of paper weighing 1 oz into small pieces. What most likely happens to the weight of the sheet of paper after Rodney tears it into pieces?