Year 8 Chemical World Revision

Metal or Nonmetal

100

High Density

Metal 

200

Low melting/boiling point

Nonmetal

300

Brittle

Nonmetal

400

Lustrous

Metal

500

Ductile

Metal

Chemical Formula

100

Chemical Formula for Water

H₂O

200

Chemical Formula for Carbon dioxide

CO₂

300

Chemical symbol for iron 

Fe

400

Chemical Symbol for Hydrochloric acid

HCl

500

Chemical Symbol for table salt

NaCl

Periodic Table

100

The columns of the periodic table are called...

Groups

200

The rows of the periodic table are called ...

Periods

300

Atomic number tells us the number of ___________ and the number of ____________

Protons and Electrons

400

___________ have a positive charge. 

___________ have a neutral charge (no charge). 

___________ have a negative charge.

Protons

Neutrons 

Electrons

500

The atomic mass tells us ... 

The number of protons + the number of neutrons

Element Compounds Mixtures

100

Water

Compound

200

Neon

Element

300

Bronze

Mixture

400

Air

Mixture

500

Deoxyribonucleic Acid

Compound

Random

100

A substance that is used to produce nuclear power and atomic bombs is 

Urainium

200

Type of materials that are good conductors

Metals

300

Silicon is a ______________. The property that makes it useful in mircochips is that it is a ______________.

Metaloid

Semiconductor

400

If an element has an atomic number of 19 and an atomic mass of 39, how many protons, neutrons, and electrons does it have? 

Protons and electrons = 19 

Neutrons = 20

500

If an atom has 9 electrons, 9 protons and 10 neutrons, what is the:

Atomic Mass? 

Atomic Number? 

Atomic mass = 19 

Atomic Number = 9