ELEMENTS

Question 1

How many elements are there?

Answer 1

92

Question 2

Can elements be split up into other substances? - 2

Answer 2

1. No - they are made of just one type of particle called an ATOM.
2. The atoms of each element are different.

Question 3

Who came up with the theory that all matter was made up of very small building blocks he called ATOMOS?

Answer 3

DEMOCRITUS - he wasn’t a scientist so no one paid any attention to him until the 1800s

Question 4

What does ATOMOS mean?

Answer 4

It is the Greek word for ‘cannot be split up’

Question 5

What was John Dalton’s Atomic Theory - 5 points

Answer 5

1. Elements made of tiny particles called Atoms
2. All atoms of a given element are identical
3. Atoms of a given element are different to those of other elements and can be distinguished by their weight
4. Atoms of one element can be combined with other to form chemical compounds
5. Atoms cannot be created, divided into smaller particles or destroyed

Question 6

Name 6 physical properties of metals

Answer 6

1. Shiny
2. Good conductors of heat
3. Good conductors of electricity
4. High melting point
5. Ductile (most metals can be drawn out into thin wires)
6. Malleable (most metals can be hammered into thin sheets)

Question 7

Name 7 physical properties of non-metals

Answer 7

1. Not shiny
2. Poor conductors of heat
3. Poor conductors of electricity
4. Low melting point
5. Brittle (breaks easily)
6. Not ductile
7. Not malleable

Question 8

What is a chemical reaction?

Answer 8

A change in the way the atoms are grouped together

Question 9

Elements are divided into 2 groups, what are these?

Answer 9

Metals and non-metals

Question 10

What does the term ‘carat’ mean for gold? - 2

Answer 10

1. The purity.

2. The higher the carat the purer it is

Question 11

What colour is chlorine gas?

Answer 11

Yellowish-green

Question 12

What % of the Earth’s atmosphere is Nitrogen?

Answer 12

78%

Question 13

Is mercury a solid, liquid or gas at room temperature?

Answer 13

Liquid

Question 14

Give 2 parts of the human body that contain a lot of calcium

Answer 14

1. Bones

2. Teeth