Phase Changes and Substances.

Question 1

What is the triple point?

Answer 1

The point on a phase change diagram where both a solid, liquid and gas co-exist.

Question 2

What is the critical point?

Answer 2

The point on a phase change diagram where the substance becomes a supercritical fluid and does not undergo a directly noticeable phase change.

Question 3

What are the lines on a phase diagram called?

Answer 3

The lines of equilibrium.

Question 4

What is Fusion?

Answer 4

The Melting of solid to liquid phase Change. A positive Entropy.

Question 5

What is Vaporization?

Answer 5

The phase change from liquid to gas, sometimes called boiling. Positive entropy change.

Question 6

What is Freezing?

Answer 6

Phase change from Liquid to solid. Negative Entropy.

Question 7

What is Condensation?

Answer 7

Phase change from gas to liquid. Negative Entropy.

Question 8

What is Sublimation?

Answer 8

Phase change from solid to gas (think of Dry Ice CO₂). Positive entropy change.

Question 9

What is Deposition?

Answer 9

Phase change from Gas to solid, think of snow. Negative entropy change.

Question 10

What side of an exothermic equation is favored when heat is added?

Answer 10

The reactants.