KPT

Question 1

Characteristics of solid

Answer 1

Arrangement of particles: Packed closely in orderly arrangement

Movement of particles: Vibrate about in fixed positions
Due to particles held in fixed positions by strong forces of attraction

Question 2

Characteristics of a liquid

Answer 2

Arrangement of particles: Packed fairly closed together in an disorderly arrangement

Movement of particles: Able to slide past each other throughout the liquid
Due to particles held by strong forces of attraction

Question 3

Characteristics of a gas

Answer 3

Arrangement of particles: Spaced very far apart, randomly arranged

Movement of particles: Able to move randomly and freely in all directions at great speeds
Due to weak intermolecular forces of attraction between particles

Question 4

Define diffusion

Answer 4

Diffusion is the process in which a substance moves from a region of higher concentration to lower concentration due to the constant and random motions of its particles

Question 5

What are the 2 factors affecting rate of diffusion

Answer 5

1. Temp
   - Speed of diffusion increases with temp because particles gain energy at higher temp so they move faster, higher the temp, faster rate of diffusion
2. Relative molecular mass of particles
   - Larger the relative molecular mass, the slower the rate of diffusion
   - Smaller the relative molecular mass, the faster the rate of diffusion

Question 6

Boiling VS Evaporation

Answer 6

Boiling:

• Happens at a fixed temperature, only at mp
• Takes place throughout the liquid
• Rapid process
• Requires continuous supply of heat

Evaporation:

• Takes place at any temp between mp & bp
• Takes place only at surface
• Slower process
• Results in liquid becoming cooler due to loss of high energy particles