Solids, Liquids And Gases

Question 1

Solid

Answer 1

-packed closely (regular structure)
-particles held together by strong bonds (forces)
-particles vibrate about fixed positions

Question 2

Liquid

Answer 2

-packed closely (difficult to compress)
-particles held by weaker bonds than in solids
-particles flow around one another

Question 3

Gas

Answer 3

-separated by relatively large distances
-very weak forces between particles
-particles move randomly
-can expand and compress

Question 4

What are changes of state?

Answer 4

Physical changes (reversible) that change the internal energy of a substance, conserving the mass

Question 5

Solid —> gas

Answer 5

Sublimation

Question 6

What is the internal energy of a system?

Answer 6

The total kinetic and potential energy of all the particles it contains

Question 7

Increasing internal energy…

Answer 7

Latent heat is being supplied to allow for a change of state

Question 8

Decreasing internal energy…

Answer 8

Latent heat is being released to allow for a change of state