Cells

Question 1

In a ………. each atom of an element is always joined to a fixed number of atoms.
John Daltons atomic theory

Answer 1

Compound

Question 2

Everything is made up of tiny particles called ……..

John Daltons atomic theory

Answer 2

Atoms

The smallest partial of a chemical element that can exist

Question 3

Atoms cannot be created or ………

John Daltons atomic theory

Answer 3

Destroyed

Question 4

The atoms in an …….. are identical

John Daltons atomic theory

Answer 4

Element
Substance that is only made of one type of atom
Eg hydrogen H2
Oxygen 02

Question 5

During chemical reactions atoms are rearranged to make …… substances

John Daltons atomic theory

Answer 5

New

Question 6

Oxygen

Answer 6

O

Question 7

Water

Answer 7

H2o

Question 8

Clorine

Answer 8

Cl

Question 9

Lithium

Answer 9

LI

Question 10

Sodium

Answer 10

Na

Question 11

Iron

Answer 11

Fe

Question 12

Bromine

Answer 12

Br

Question 13

Sulfur

Answer 13

S

Question 14

Where do you find the electron

Answer 14

Outer shell

Question 15

Where do you find the neutron

Answer 15

Nucleus

Question 16

Where do you find the proton

Answer 16

Nucleus

Question 17

Nitrogen

Answer 17

N

Question 18

Carbon

Answer 18

C

Question 19

What is a compound

Answer 19

Substance that is made of two or more types of atoms that have chemically reacted
The new compound is totally different to the original elements

Question 20

Solid properties ( Also know the diagram)

Answer 20

Cannot flow
Cannot be compressed
Strong bonds
Fixed volume
Dense (lots of particles in a small volume)
Definite shape

Question 21

Liquid properties

Answer 21

Can flow easily
Change shape
Cannot be compressed
Medium density (quite a lot of particles in a small volume)
Some forces of attraction between the particles
Particles are close but free to move
Don’t keep a definite shape

Question 22

Gas properties

Answer 22

Easily flow
Move freely 
Can be compressed
Most energy
Very weak forces between the particles 
Don’t keep a definite shape
Low density ( not many particles in a large volume)

Question 23

When two / three or more different elements combine, this is called

Answer 23

A compound

Question 24

Naming compounds:
When two different elements combine, the compound ends in ide
Eg sodium + chlorine =
Magnesium + oxygen =

Answer 24

Sodium chloride

Magnesium oxide

Question 25

Naming compounds: When three or more different elements combine and one is oxygen, the ending is something- ate Copper + sulphur + oxygen =

Answer 25

Copper sulphate

Question 26

Structure of compounds-

Answer 26

See diagram Small group of atoms - called molecules Lattice structure - billions of atoms joined together

Question 27

When does a solid change into a liquid

Answer 27

At its melting point | Remember- the melting point is the SAME as it’s freezing point.

Question 28

If a substances boiling point is higher than 50 degrees C and its melting point is lower than 20 degrees C, when is it a liquid?

Answer 28

25 degrees C

Question 29

What are the properties of metals?

Answer 29

Good conductors of electricity Malleable Flexible High melting point

Question 30

What are the properties of non metals

Answer 30

Poor conductors of heat and electricity | Found on the right side of the periodic table

Question 31

What forms acidic oxides

Answer 31

Non metals

Question 32

What forms alkaline oxides

Answer 32

Metals | Found on the left side of the periodic table

Question 33

What is a molecule

Answer 33

A group of a set of atoms joined together

Question 34

What gas is needed for elements to burn

Answer 34

Oxygen

Question 35

When you burn an element in air/ oxygen, what is formed

Answer 35

Oxide eg calcium oxide Carbon dioxide