C1.1

Question 1

What is a solid?

Answer 1

Solid

• Particles packed together
• Particles vibrate about a fixed position

Question 2

What is a liquid?

Answer 2

Liquid:

• Particles close together
• Move around each other

Question 3

What is a gas?

Answer 3

Gas:

• Particles spread far apart
• Move around randomly in all directions

Question 4

What is a physical change?

Answer 4

Physical change:

• No new substances made
• Reversible

Question 5

What is a chemical change?

Answer 5

Chemical change:

• 1 or more substances created
• Usually irreversible

Question 6

What does particle model not show?

Answer 6

Particle model does not show:

• Forces between particles (electrostatic)
• Size of particles
• Space between particles