3.1.1 introduction

Question 1

physical changes create __ ___ __________

Answer 1

no new substances

Question 2

physical changes are usually ____ to reverse

Answer 2

easy

Question 3

physical changes absorb or release small amounts of ______

Answer 3

energy

Question 4

what is the chemical test for water

Answer 4

anhydrous copper (II) sulphate

Question 5

anhydrous copper (II) sulphate turns from

Answer 5

white to blue if water is present

Question 6

the melting point for pure water is near

Answer 6

0 degrees

Question 7

the boiling point for pure water is near

Answer 7

100 degrees

Question 8

metal properties include

Answer 8

high melting and boiling points
electrical conductors
malleable
shiny

Question 9

non-metal properties include

Answer 9

low melting and boiling points
electrical insulators
brittle
dull

Question 10

metals are on the ____ side on the periodic table

Answer 10

left

Question 11

non-metals are on the _____ hand side of the periodic table

Answer 11

right

Question 12

chemical changes create ___ __________

Answer 12

new substances

Question 13

chemical changes are usually _________ to reverse

Answer 13

difficult

Question 14

chemical changes absorb or release large amounts of ______

Answer 14

energy

Question 15

a good example of a physical change is

Answer 15

ice melting in a beaker

Question 16

a good example of a chemical change is

Answer 16

burning wood on the floor

Question 17

when ice is melted in a beaker the particles are still _____ particles

Answer 17

water

Question 18

you can reverse ice is melted in a beaker by

Answer 18

putting the water in the freezer

Question 19

when ice is melted in a beaker the beaker does not get much

Answer 19

hotter or colder

Question 20

when wood is burnt on the floor the wood & oxygen particles turn into

Answer 20

soot & ash

Question 21

when wood is burnt on the floor it is impossible to collect the ____ & ___ and turn it

Answer 21

soot & ash
back into wood

Question 22

when wood is burnt on the floor the floor gets

Answer 22

really hot

Question 23

physical changes absorb or release _____ amounts of energy

Answer 23

small

Question 24

chemical changes absorb or release _____ amounts of energy

Answer 24

large

Question 25

describe what happens when a substance melts

Answer 25

• the particles gain kinetic energy
• they vibrate faster
until they have energy to break
the forces holding them together
• they move past eachother

Question 26

why does water evaporate faster at a higher temperature

Answer 26

• the kinetic energy of the particles
increase
• more particles have enough energy
to break the forces holding them
together

Question 27

solid movement

Answer 27

regular arrangement
vibrating in fixed position

Question 28

liquid movement

Answer 28

random and close
move past eachother

Question 29

gas movement

Answer 29

random and far apart
randomly moving at very high speeds

Question 30

solid to gas is

Answer 30

deposition

Question 31

gas to solid is

Answer 31

sublimation

Question 32

solid to liquid is

Answer 32

melting

Question 33

liquid to solid is

Answer 33

freezing

Question 34

liquid to gas is

Answer 34

boiling

Question 35

had to liquid is

Answer 35

condensing

Question 36

when a solid turns into a liquid

Answer 36

the particles vibrate more and gain heat energy
they then can overcome some of the bonds that kept them in fixed position
they can move around and the solid becomes a liquid