2.3 Types of substances and conductivity

2.4 types of substances and conductivity
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2.4 types of substances and conductivity

Slide 1 - Diapositive

Molecules
A molecule is the smallest particle of a substance with the same properties of that substance.
  • The molecule model shows what a molecule looks like
  • A few nanometers (1nm= 0.000000001mm)

Slide 2 - Diapositive

The molecule model of water

Slide 3 - Diapositive

Molecules in different fases

Slide 4 - Diapositive

Types of substances

Slide 5 - Diapositive

Different atoms

Slide 6 - Diapositive

types of substances
  • Metals  
  • Molecular substances
  • Salts

Slide 7 - Diapositive

Metals
A substance consisting only of metal atoms
Shiny surface
formable
conduct heat
Conduct electricity in solid and liquid phase

Slide 8 - Diapositive

Corrosion sensitivity
A process in which a metal reacts with oxygen and water. 
  • With iron it's called rusting.
  • Some types of metals are more sensitive for corrosion than others

Slide 9 - Diapositive

Precious metals
Metals that do not react with oxygen and water
Gold
Silver
Platinum

Slide 10 - Diapositive

semi-precious metals
Metals that react with difficulty with oxygen and water
Mercury
Copper

Slide 11 - Diapositive

Base metals
metals that react with water and oxygen
Iron
Zinc

Slide 12 - Diapositive

Very base metals
Metals that react very violently with oxygen and water
Potassium
Sodium
Magnesium

Slide 13 - Diapositive

Alloy
Two or more types of metal atoms combined is called an alloy.
Used to make a metal stronger 

Slide 14 - Diapositive

In which fase can metals conduct electricity?
A
Gas and liquid
B
dissolved and gas
C
liquid and dissolved
D
solid and liquid

Slide 15 - Quiz

What are base metals?
A
Metals that do not react with oxygen and water
B
Metals that react with difficulty with oxygen and water
C
Metals that react easily with water and oxygen
D
Metals that react very violently with oxygen and water

Slide 16 - Quiz

Molecular substances
Connections between non-metal atoms
 Few common features
do not conduct electricity
Molecules

Slide 17 - Diapositive

Salts
Decomposable substances consisting of metal atoms and non-metal atoms.
Strong but fragile
Do not conduct electricity as a solid
In liquid or dissolved phase, salts can conduct electricity because the particles then move freely

Slide 18 - Diapositive

Which types of atoms is a molecular substance made of?
A
non-metalatoms
B
metalatoms
C
non-metalatoms and metalatoms

Slide 19 - Quiz

In which phase can a salt conduct electricity?
A
Solid and liquid
B
gas and solid
C
dissolved and gas
D
dissolved and liquid

Slide 20 - Quiz