7H - Atoms, molecules, elements and compounds Flashcards
What is a molecule?
More than one atom bonded together.
What are mixtures?
Materials that contain more than one substance which are NOT joined together.
What happens if a natural material is pure?
Contains only one substance (isn’t mixed).
What are elements?
Substances made out of only one type of atom.
What are compounds?
Substances made out of more than one kind of atom (element) bonded together.
What is O?
Oxygen
What is Mg?
Magnesium
What is Fe?
Iron
What is Si?
Silicon
Where do we obtain all the elemnts and compounds we need from?
From the earth’s atmosphere and crust.
Why is it important to recycle?
Because our resources are limited and some may run out in the near future.
What are the 5 common properties of metals?
- High melting point
- Strong and flexible
- Shiny
- Good conductors of heat
- Good conductors of electricity
What are the 5 common properties of non metals?
- Low melting points
- Brittle
- Not shiny
- Poor conductors of heat
- Poor conductors of electricity
What determines the uses of a material?
Its properties.
i.e. copper is strong, flexible and conducts electricity so its used for electricity cables.
What is the name of the only liquid metal?
Mercury