C1.1 - The Particle Model

Question 1

Describe the arrangement of particles in a solid state

Answer 1

Regular and very close

Question 2

Describe the arrangement of particles in a liquid state

Answer 2

Random and close

Question 3

Describe the arrangement of particles in a gas state

Answer 3

Random and far apart

Question 4

Describe the main movement of particles in a solid state

Answer 4

Vibrate around fixed positions

Question 5

Describe the main movement of particles in a liquid state

Answer 5

Move around each other

Question 6

Describe the main movement of particles in a gas state

Answer 6

Move quickly in all directions

Question 7

Why can solid and liquid substances not be compressed?

Answer 7

There is no space for the particles to move into

Question 8

What are the two main differences between physical and chemical changes?

Answer 8

Physical changes -
Reversible
Changes of state. Still the same substance
Chemical changes -
Irreversible
Breaks old chemical bonds to form new ones, making new substances

Question 9

What is the formula for ratio of distance to diameter for atoms?

Answer 9

Distance between atoms
___________________________
Diameter of atom

Question 10

What happens to electrostatic forces when particles get further apart?

Answer 10

They become weaker

Question 11

What are the 3 main limitations of the particle model

Answer 11

It does not take into account:
. The forces between particles
. The size of particles
. The space between particles

Question 12

Differences between chemical and physical changes

Answer 12

Physical - reversible, no new substance made
Chemical - irreversible/difficult to reverse, new substance made