Chapter 1 Matter

Question 1

What are the properties of a solid

Answer 1

They have fixed shape

They have fixed volume

Question 2

What are the properties of liquid

Answer 2

They have no fixed shape

They have a fixed volume

Question 3

What are the properties of gases

Answer 3

They have no fixed shape

They have no fixed volume

Question 4

Why do gases have no fixed shape

Answer 4

They particles are far apart and have no forces of attraction

Question 5

Why are solid have a fixed shape

Answer 5

Because they are closely parked and only vibrate

Question 6

What happens when liquids are heated

Answer 6

They move faster and attractive forces become weaker and turns gaseous state

Question 7

Explain the movement of solid and liquids

Answer 7

The liquid close pass each other

The solids vibrate in a fixed position

Question 8

How are gases molecule arranged

Answer 8

They molecules are far apart

Question 9

What happens when liquid is cooled

Answer 9

Liquid contract and solidify when cooled

Question 10

What happens when solids are cooled

Answer 10

They contract and state stays the same

Question 11

What happen when gases are cooled

Answer 11

Gases condenses to liquid when cooled

Question 12

What team is used when solids changes to gases

Answer 12

Its called sublimation

Question 13

What happens when a pure substance is heated

Answer 13

The temperature of a melting solid becomes constant.

Question 14

State whether melting is a physical or chemical change

Answer 14

Its a physical change because no new substances are formed

Question 15

Whats the basic unit present in oxygen gas

Answer 15

Oxygen atoms

Question 16

What basic units in a solid sodium chloride

Answer 16

Sodium and chloride atoms

Question 17

What basic units found in molten aluminum oxide

Answer 17

Aluminum and oxygen atoms

Question 18

What is diffusion

Answer 18

Is a process by which move from a region of high concentration to a region of lower concentration until until particles are evenly distributed

Question 19

In what phase do diffusion occur

Answer 19

In gas and liquid state only

Question 20

State any two factors affect the rate if diffusion

Answer 20

Temperature

Particle size

Question 21

Why do wet cloths dry faster in warm days than cold

Answer 21

Because wet cloths gain more kinetic energy from high Tempreture resulting high evaporation and dry faster

Question 22

Solids lose it shape when melts why

Answer 22

The particles vibrate and gain heat thus there is week forces and the particles slide each other losing shape

Question 23

Salt dissolves faster in hot water than cold why

Answer 23

They move faster in hot water thus the particles collide with water molecules and dissolve faster

Question 24

When sugar is added to water when dissolves taste sweet

Answer 24

Because the sugar particles diffuse through out making it sweet