State the physical properties of:
Metals
- High Melting and boiling point
- Malleable and ductile
- Sonorous
- Good conductor of heat and electricity
State the physical properties of:
Metalloids
- Alloys of metalloids are good contuctors of electricity
- High melting and boiling points
State the physical properties of:
Non-Metals:
- Bad/non conductors of heat and electricity
- Not malleable and ductile
- Low melting and boiling points
State examples of Metals
- Lithium
- Sodium
- Potassium
State examples of metalloids
- Silicon
State examples of non-metals
- Sulfur
- Phosphorous
- Carbon
Define:
Element
Element is a pure substance that cannot be broken down into a more simpler substance
Define:
Compound
compounds are pure substance, containing two or more elements which are chemically bonded in a fixed ratio
Define:
Mixture
Mixture contains two or more than two components which are not chemically bonded and there is no fixed ratio compounds of mixture can be seperated by physical method
Give example of:
Compound
H20
Give example of:
Mixture
Sea water is the mixture of salt and water
Properties of:
Element
- made of 1 type of atom
- naturally formed
- No fixed ratio
- They have their own properties
- They have fixed melting and boiling points
Properties of:
Compound
- Made of 2 or more types of elements
- Formed by chemical reaction
- Fixed ratio
- They have different properties
- They have fixed melting and boiling points
Properties of:
Mixtures
- 2 or more types of elements or atoms but not chemically bonded
- Physically formed by physical mixing
- No fixed ratio
- They have their own properties
- Boils and melts over a range of temperatures
Define:
Malleable
Changing shape on hammering
Define:
Ductile
Drawn into narrow wires
Why are metals malleable and ductile?
Metals have layer structure. Layers can slide over if pressure applied. Layer slide over and stay at their new position
