Chemistry unit 1 Physical or Chemical Changes

Question 1

What are the 3 states of matter?

Answer 1

Solid, liquid and gas

Question 2

Name 3 properties of a solid

Answer 2

They have a fixed shape, really strong bonds between molecules, they do not pour

Question 3

Name 3 properties of a liquid

Answer 3

Can be poured, take shape of their container, slightly less close packed, intermolecular bonds are strong

Question 4

Name 3 properties of a gas

Answer 4

particles are spread out, intermolecular bonds are weak, spread out to fill all available space, gas molecules are constantly moving

Question 5

The boiling point of water is?

Answer 5

100 oC

Question 6

The Freezing point of water is?

Answer 6

0oC

Question 7

Water is made up from 2 types of atom. They are….

Answer 7

Oxygen and Hydrogen

Question 8

What do you call the process by which a liquid becomes a gas?

Answer 8

evaporation

Question 8

What do you call the process by which a liquid becomes a solid?

Answer 8

Freezing

Question 9

What do you call the process by which a solid becomes a liquid?

Answer 9

Melting

Question 10

What do you call the process by which a gas becomes a liquid?

Answer 10

Condensation

Question 11

What do call the process by which a gas becomes a solid?

Answer 11

Deposition

Question 12

What do you call the process bu which a solid becomes a gas?

Answer 12

Sublimation

Question 13

As a block of ice starts to melt, the bonds between the oxygen and hydrogen particles starts to …. and ….

Answer 13

weaken and break

Question 14

Name 3 types of precipitation

Answer 14

rain, snow, sleet, hail

Question 15

What causes evaporation of the seas and oceans?

Answer 15

The heat from the sun

Question 16

What does water vapour form when it condenses in the atmosphere?

Answer 16

clouds

Question 17

Name the 3 places that rain goes when it falls?

Answer 17

Ground water, surface runoff, aquifers

Question 18

Name the other source of water vapour in the atmosphere?

Answer 18

Transpiration from trees

Question 19

What has happened to the clouds so that it rains?

Answer 19

They become saturated

Question 20

What determines the type of precipitation that we get?

Answer 20

The air temperature in the atmosphere

Question 21

What does AQ stand for?

Answer 21

Saturated solution

Question 22

What is a reversible reaction?

Answer 22

when a substance can be separated when heated and put back together when cooled without losing mass.

Question 23

What is an example irreversible reaction?

Answer 23

Frying an egg or backing a cake because these ingredients can not be taken out or reversed once backed.