Matter

Question 1

Describe the arrangement and movement of particles in solids.

Answer 1

Particles are closely packed in an orderly manner.
They vibrate about their fixed positions.

Question 1

What is matter made of?

Answer 1

It is made up of small discrete
particles in constant and random motion.
Then it arranges into solid, liquid and gas.

Question 2

Describe the arrangement and movement of particles in liquids.

Answer 2

Particles are closely packed in a disorderly manner.
They move randomly and slide past each other.

Question 3

Describe the arrangement and movement of particles in gases.

Answer 3

Particles are far apart and are disorderly.
They move randomly and quickly

Question 4

What is diffusion?

Answer 4

Net movement of particles from a region of higher concentration to a region of lower concentration.

Question 5

What happens to particles when a solid substance is heated?

Answer 5

Its particles GAIN ENERGY, and vibrate MORE VIGOROUSLY about their fixed positions

Hence, the distances between the particles increase

Causing Volume of substance to increase –> substance expands

Question 6

What happens to particles when a solid substance is cooled?

Answer 6

Its particles LOSE ENERGY, and vibrate LESS vigorously about their fixed positions

Distance btwn particles decreases –> vol decreases

Hence substance contracts