Physics WA1

Question 1

Topic: Kinetic Particle Model of Matter

What is the kinetic particle model of matter

Answer 1

Made up of tiny particles that are in constant motion

Question 2

Topic: Kinetic Particle Model of Matter

What is an internal energy?

Energy from random motion + forces between particles

Answer 2

An energy store that is made up of the total kinetic energy from random motion of particles and total potential energy between particles

Question 3

Topic: Kinetic Particle Model of Matter

Arrangement/Motion of Solids

Arrangement/Motion

Answer 3

| Motion
- Particles vibrate about their fixed positions and held by strong attractive forces between the particles

| Solids have highest density, fixed shape and volume

Arrangement
- Particles closely packed in an orderly manner
- Least amount of energy

Question 4

Arrangement/Motion of Liquids

Answer 4

|Arrangement
- Particles are less closely packed in disorderly manner

|Motion
- Particles slide past each other freely without fixed postitions
- Forces holding the particles are weaker than in solids

Liquids have slightly lower densities than solids, fixed volume, no fixed shape

Question 5

Arrangement/Motion of Gas

Answer 5

|Arrangement
- Far apart from one another in disorderly manner
- Particles have the most energy

|Motion
- Particles move freely and randomly in all direction
- Weak attractive forces between particles

Gases have lowest densities, no fixed volume and shape

Gases are compressable

Question 6

What is the temperature reading?

Answer 6

Temperature rises with the average kinetic energy of the particles in a body

Question 7

Changes of state

Boiling, Melting, Condensation, Solidification

Answer 7

|Melting/Boiling: energy transferred to substance

|Solidification/Condensation energy transferred out of substance