Chap 7: Model of Matter

Question 1

What is the forces of attraction in solid

Answer 1

Very strong forces of attraction

Question 2

What is the forces of attraction in liquid

Answer 2

Strong forces of attraction

Question 3

What is the forces of attraction in gas

Answer 3

weak forces of attraction

Question 4

What is the arrangement in a liquid

Answer 4

Closely packed in a disorderly manner

Question 5

What is the arrangement in a solid

Answer 5

Very closely packed in a orderly manner

Question 6

What is the arrangement in a gas

Answer 6

Far apart in a disorderly manner

Question 7

What are the movements in solid

Answer 7

Vibrate among their fixed positions

Question 8

What are the movements in liquid

Answer 8

Slide past one another

Question 9

What are the movements in gas

Answer 9

Randomly and quickly

Question 10

What happens when a substance in the solid state is heated?

Answer 10

It’s particles gain more energy and vibrate more amongst their fixed positions, the distance between the particles increase and the volume of the solid increases
( same thing goes for liquids and gases )

Question 11

What happens when a substance is cooled?

Answer 11

It’s particles lose energy and vibrate less amongst their fixed positions, the distance between the particles decrease and the volume of the solid decreases
( same goes for liquids and gases )

Question 12

**What happens when a solid melts into liquid?

Answer 12

When a solid is heated, they vibrate faster about their fixed positions. They eventually gain enough energy to overcome the very strong forces of attraction between them, thus melting into a liquid

Question 13

**What happens when a liquid boils into a gas?

Answer 13

When the liquid is heated, its particles gain energy. They move faster and further apart from one another. They eventually gain enough energy to overcome the strong forces of attraction between them, thus boiling into gas

Question 14

What is diffusion?

Answer 14

Diffusion are particles moving in constant, random motion from a region of higher concentration to a region of lower concentration.

Question 15

What happens when particles is added into a beaker of water?

Answer 15

The particles move in a constant and random motion. The particles eventually moves from a region of higher concentration to a region of lower concentration and eventually becomes uniform due to the overall net movement of particles

Question 16

** what happens when a gas condenses into liquid?

Answer 16

Particles in gas lose energy, move slower and are pulled closer together by forces of attraction.

Question 17

**what happens when a liquid freezes into a solid

Answer 17

Particles in liquid lose energy, move slower, and are pulled closer together by forces of attraction and held in fixed positions.

Question 18

What are the changes when particles are heated/ cooled.
(state solid liquid and gas)

Answer 18

particles gain energy and move more vigorously (gas), / slide past each other more vigorously (liquid)/ vibrate more vigorously about their fixed positions (solid)
(replace more with less for cooled)

The distance between the particles increase when heated, and decreased when cooled.
*there is no change in particle size or number**

Question 19

What are applications of diffusion?

Answer 19

Perfume making

Question 20

what is Brownian motion

Answer 20

it is when a particle that is suspended in liquid or gas is being bombarded by liquid or air particles, causing it to move in constant random motions.

Question 21

What are some applications of atomic techniques and their cons?

Answer 21

properties of atomics are applied in X-ray and radiation therapy to cure diseases

however the use of atomic bombs can lead to destructive effects