Lesson 2- Particle Theory Of Matter

Question 1

Define the following terms: Matter, Mass, and Volume

Answer 1

Matter - anything that has mass and volume
Mass - the amount of matter in an substance
Volume → the amount of space a substance occupies

Question 2

Identify the 6 main points of the particle theory of matter.

Answer 2

1. All matter is made up of particles.
2. All particles are in constant motion
3. All partices of one substance are identical.
   4: Tempature affects the speed at which partides move
4. In liquds and solids, the particles are closer together and have strong forces of attraction between them.
5. In a gas, there are large spaces between the particles

Question 3

Identify and explain the particle structure with the three states of matter.

Answer 3

1. Solid state
   • Solids hold a definite shape because the particles are packed closely together and vibrate in one place.
   Example: ice
2. Ligud state
   • Liquids can flaw and take the shape of their container because their particles have partly overcome their attraction for eachother.
   Example: water
3. Gaseous state
   • Gases can flow and spread out because their particles are far apart and have completly overcome their attraction for eachother.
   Example: Clouds

Question 4

Explain the concept of ‘Thermal Expansion’ and ‘Contraction’.

Answer 4

Thermal expansion is when the temperature of a solid, liquid or gas increases causing the particles to move faster and, further apart causing them to expand

Contraction is when the tempature of a solid liquid or gas decreases so its particles move slowly and closer together causing the substance to contract