Atoms, Compounds And Mixtures (1)

Question 1

All substances are made up of _________

Answer 1

Atoms

Question 2

Where is the nucleus located in the atom

Answer 2

In the center

Question 3

The nucleus contains _________ and _________

Answer 3

Protons and neutrons

Question 4

Almost the whole _________ of the atom is concentrated in the nucleus

Answer 4

Mass

Question 5

Size-wise the nucleus is ________ compared to the rest of the atom

Answer 5

Tiny

Question 6

Electrons move around the nucleus in energy levels called __________

Answer 6

Shells

Question 7

Electrons are ___________ charged

Answer 7

Negatively

Question 8

Electrons are ______ but cover a lot of space

Answer 8

Tiny

Question 9

The size of an electron’s __________ determines the size of the atom

Answer 9

Orbit

Question 10

Electrons have virtually no ___________

Answer 10

Mass

Question 11

Relative mass and charge of a proton

Answer 11

1

Positive

Question 12

Relative mass and charge of a neutron

Answer 12

1

Neutral

Question 13

Relative mass and charge of electrons

Answer 13

1/2000

Negative

Question 14

The relative mass of a proton is 1
The relative mass of a neutron is 1
The relative mass of an _____________ is 1/2000

Answer 14

Electron

Question 15

How is the number of electrons similar to the number of protons

Answer 15

It is equal

Question 16

The _________ on the electrons is the same size as the charge on the protons but _____________

Answer 16

Charge

Opposite

Question 17

The number of electrons always equals the number of __________ in a neutral atom

Answer 17

Protons

Question 18

What does the mass number tell you

Answer 18

Total number of protons and neutrons

Question 19

What does the atomic number tell you

Answer 19

The number of protons

Question 20

Atoms of the same element always have the same number of _____________ - so atoms of different elements will have different numbers of _____________

Answer 20

Protons

Protons

Question 21

To get to the number of neutrons, just do:

_________ number - ____________ number

Answer 21

Mass number - atomic number

Question 22

Which number is the mass number

Answer 22

The top one

Question 23

Which number is the atomic number

Answer 23

The bottom one

Question 24

Atoms can join together to form ____________

Answer 24

Molecules

Question 25

Some molecules are made from just one _____________ (E.g H2 or N2) while other are made up of more than one _____________ (e.g H2O or Co2)

Answer 25

Element

Element

Question 26

Molecules are held together by ____________ bonds

Answer 26

Covalent

Question 27

Elements consist of one type of _________ only

Answer 27

Atom

Question 28

Atoms in gases often go around in __________

Answer 28

Pairs

Question 29

A molecule with two atoms in it is called a ____________ molecule

Answer 29

Diatomic

Question 30

What is a compound

Answer 30

A substance that is made of two or more different elements which are chemically joined (bonded) together

Question 31

The properties of a compound are often totally different from the properties of the original ____________. For example, if a mixture of iron and sulphur is heated, they form the compound iron sulphide. However it is not much like iron (not magnetic) nor sulphur (not yellow)

Answer 31

Elements

Question 32

There’s no chemical bond between the different parts of a __________. This is opposite to a ____________. The parts can be separated out by physical methods such as ____________

Answer 32

Mixture
Compound
Distillation

Question 33

A mixture of iron powder and sulphur powder will show the properties of _________ iron and sulphur. (It will be magnetic and yellow)

Answer 33

Both