Review of Blue Tack Prac All atoms of a type of element are the same size. Pure substances have only...

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 space31 pm across, (pm = trillionth of a metre)Inert meaning will not burn or form a chemical reation.1916 picture (Year 9) shows two electrons, two neutrons, two protonsGlenn and Matt’s model is good, but would be perfectly round With solid surface.

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

H2 Gas 3D all Molecules are theSame size

In real life it looks likeA football, spins and vibrates

Glenn and Matt, 3 types of oxygen, O3 is ozone, the O will bump into a O2

And from O3

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 CaCO3 (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.

http://www.netdenizen.com/buttonmill/glassy.php

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 GeneratorElectrical Energy