Matter

Question 1

Define chemistry

Answer 1

Is the study of elements and their properties

Question 2

What is a periodic table

Answer 2

It is an orderly arrangement of elements according to their atomic numbers

Question 3

Name the 3 categories of the periodic table

Answer 3

Metals
Semi metals
Non metals

Question 4

What are the horizontal lines on the periodic table

Answer 4

These are called groups

Question 5

What are the vertical lines called

Answer 5

They are called periods

Question 6

Fact about metal

Answer 6

It is good conductor of heat

Question 7

2 types of metals liquid at room temperature

Answer 7

Mercury and gallium

Question 8

What is an atom mead up of

Answer 8

Sub atomic particles protons electrons and neutrons

Question 9

Describe sub atomic particles

Answer 9

Proton | posetive | 1 a.m u|nuclus
Electron| negative|negiable|shells
Neutron| neutral| 1.a.m.u | nucleus

Question 10

Define matter

Answer 10

Any substance that has a mass and occupies volume

Question 11

Atoms

Answer 11

The smallest particles of matter

Question 12

Define pure substances and list 2 types

Answer 12

Are those which has one type of atom or molecules
They include•compound and elements

Question 13

Who developed the periodic table

Answer 13

Dimitri mendeleev in 1860 he was a Russian chemist

Question 14

Define compound

Answer 14

Is made up of two or more different elements combined together chemically

Question 15

Define molecule

Answer 15

Two or more atoms joined together chemically

Question 16

What stays the same in a compound

Answer 16

The ratio

Question 17

Name and explain two types of methods to break down compounds

Answer 17

Electrolysis
Breaking down a compound using electricity
Thermal decomposition
Breaking down a compound using heat

Question 18

What are mixtures

Answer 18

Two or more substances combined together and can be separated by physical means

Question 19

Two types of mixtures

Answer 19

Homogenous
Hetergenous

Question 20

3 states in which matter exists

Answer 20

Solid
Liquid
Gas

Question 21

What are solids, liquids , gas made up of

Answer 21

Particles called atoms or molecules

Question 22

Why do some substances float on other substances

Answer 22

Substances with less density float

Question 23

Why is water different

Answer 23

Solid Water consists of air bubbles

Question 24

What happens to the volume and density I temperature increase

Answer 24

The volume increase whilst the density decreases

The opposite happens if temperature decreases

Question 25

How do the state of matter react to temperature change

Answer 25

They expand if temperature increases
They contract if temperature decrease

Question 26

Define pressure

Answer 26

The amount of force applied on an area

Question 27

What is to expand
What is to contract

Answer 27

To get bigger in size(expand
To get smaller in size)

Question 28

Name 5 noble gasses

Answer 28

Helium(He)
Neon(Ne)
Argon(Ar)
Krypton(Kr)
Xenon(Xe)