Review of Blue Tack Prac All atoms of a type of element are the same size. Pure substances have only one type of particle Helium does not react, Elements.

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Presentation transcript:

Review of Blue Tack Prac All atoms of a type of element are the same size. Pure substances have only one type of particle Helium does not react, Elements with lose electrons are metals.

Discovered 1895 in Sun then found on earth. Helium is so light it leaks to outer space 31 pm across, (pm = trillionth of a metre) Inert meaning will not burn or form a chemical reation picture (Year 9) shows two electrons, two neutrons, two protons Glenn and Matts model is good, but would be perfectly round With solid surface.

Good snap shot of He perhaps sticking to a very very cold surface All He are identical, I have photoshoped a Li atom

H 2 Gas 3D all Molecules are the Same size In real life it looks like A football, spins and vibrates

Glenn and Matt, 3 types of oxygen, O 3 is ozone, the O will bump into a O 2 And from O 3

Expt: Chemical Change Statement: Chemical Change rearranges atoms, making new compounds. Aim: Explain what happens to the compounds, weigh them before and after Method –Crush CaCO 3 (Marble chips) with a morta and pestle –Weigh powder on balance (how will you hold the powder? - ans in book) –In a beaker Measure approx.40ml of 2M HCl (2M refers to the strength, HCl is Hydrochloric acid) (What safety precautions will you take?)

Weigh beaker and solution (Do you see any difference with the beam balance when different people use it, when pushed down then to rest, pushed up to rest?) Show weights in a Table to Teacher, and diagram. Mix solutions and observe Reweight final product Explain your results.

S Stored as sugar (Food Energy) M Moved from pack, down mouth, stomach, gut to liver S Stored as animal starch in liver M Moved in blood stream to cell as sugar S Stored as animal starch in cell C Burnt in cell with oxygen to energize APT C APT pulls back mini sprung legs U Springs are triggered releasing heat and motion (muscle power or Energy) U

S Stored as Coal (Chemical Energy) M Moved from earth to Powerstation (Chemical Fuel) S Stored at power station M Moved to burn chamber Burned to make heat (Heat Energy) C Moved to steam C M Changed from heat into motion (Kinetic Energy) C Changed from motion to electricity in Generator Electrical Energy