Bill Nye - Phases of Matter

What is matter, and in how many common phases does it exist?

• Anything that takes up space and has mass; 3 phases.

• Energy; 2 phases.

• A type of atom; 4 phases.

• A type of molecule; 5 phases.

What is the primary factor that causes matter to change its phase?

• Adding or removing energy.

• Altering its chemical structure.

• Increasing its pressure.

• Decreasing its temperature only.

What is Absolute Zero?

• The temperature at which all molecular motion stops.

• The coldest temperature ever recorded on Earth.

• The temperature at which water freezes.

• A theoretical temperature that can be reached with advanced technology.

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What happens when solid carbon dioxide (dry ice) is placed in warm water?

• It melts into a liquid.

• It changes directly into a gas.

• It dissolves and disappears.

• It causes the water to freeze.