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www.eastmarinedrive.com 2006. Last week our focus was separating mixtures. This included:. 1. Dissolving and evaporation. (How can we separate a mixture of salt and sand?) 2. Both simple and fractional distillation. (How do we extract petrol LPG and diesel from crude oil?)

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slide2

Last week our focus was separating mixtures. This included:

1. Dissolving and evaporation. (How can we separate a mixture of salt and sand?)

2. Both simple and fractional distillation. (How do we extract petrol LPG and diesel from crude oil?)

3. Filtering (Research the use of filters in everyday life)

4. Chromatography

5, Centrifuging (Separating by centrifugal force)

slide3

This week we should investigate the following:

1. Element and compounds

2. The work and thinking of the scientists who developed

the periodic table (Hennig Brand,Johann Dobereiner,

John Newlands and Dimitri Mendeleev)

3. The physical properties of both metals and non metals

4. How the periodic table is organised

(Groups, periods, atomic and mass numbers)

5. The reactivity of some elements

slide4

The 4 Greek elements

Based purely on observation and reasoning. Early Greeks thought that all matter was composed of 4 basic elements (or building blocks).

Earth

Fire

Air

Water

slide5

LOOK AT WOOD BURNING and you will see the evidence

It will produce ash, (this is earth!)

The wood produces fire

And lots of smoke this could be air?

You may see liquid bubbling up through the wood (water!)

slide6

WOOD

contains a mixture of all 4 elements

GREEK CONCLUSION

slide7

Elements are special substances because they contain only

one type of atom

They cannot be broken down into simpler substances by any chemical means

Earth, Air Fire and water are not elements

slide8

The Early Chemists (Alchemists, and Alchemy)

Where? and What?

The Philosopher's Stone

slide10

phosphorus.VOB

Before a Periodic Table could be developed it was necessary to discover the elements

The first big step happened in 1649

Hennig Brand

(Alchemist)

discovered

Phosphorus

(Cold Fire)

slide11

The Big Three!

What

did

they

do?

slide13

unwise.mpeg

thermit.mpeg

practical session