C1.1

Question 1

What is a particle?

Answer 1

A tiny bit of matter

Question 2

What is a particle?

Answer 2

A tiny bit of matter

Question 3

What is the particle model?

Answer 3

Particle model describes how particles are arranged and how they move in solids,liquids and gases.

Question 4

What is a physical change?

Answer 4

When a substance changes without becoming a new chemical.
No new substances are made
MOST physical changes are reversible

Question 5

What is a chemical change?

Answer 5

New substances are formed when the original chemicals react.
Produces one or more new substances
Many are difficult to reverse/impossible

Question 6

Physical change in particles

Answer 6

If a change in state, particles stay the same but their movement and arrangement change

Question 7

Chemical change in particles

Answer 7

Particles break up then join together in different ways. This is why new substances are made.

Question 8

Atoms

Answer 8

Smallest particles that make up a substance

Question 9

Force between particles

Answer 9

Electrostatic forces of attraction between positive and negative charges
Weaker when further apart, stronger when closed
Stronger in solids, weaker in gases

Question 10

Limitations of particle model

Answer 10

Doesn’t include:
Forces between particles
Size of particles
Distance between particles