Atomic Theory

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Molecule

Two or more atoms bonded together.

Compound Complex

A molecule with more than one element.

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Common chemicals

H2O2

NH3

NaOH

NaClO

I2

Compound o molecule ?

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Combustibility

The tendency to react with Oxygen O2 .

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H + O2

C + O2

N + O2

O + O2

Si + O2

Fe + O2

Common Oxides

H2O

NO2

CO2

O3

SiO2

Fe2O3

Compound o molecule ?

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Reaction Types

Nuclear

Chemical

Physical

Protons

&

Neutrons

change

Bonds

made/ broken

Electrons exchanged

No change in atoms

phase change

light emission/ absorption

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Nuclear

Reaction Types

Change in the

Gain or lose Protons , Neutrons,

Alpha, Beta particle

Fission, Fusion, Radiation

Proton Neutron

nucleus

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Chemical

Reaction Types

Bonds are made / broken

Change in oxidation states

Plasma

P+1

P+1

2

1

Li

+1

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evidence of Chemical Change:

development of a gas

formation of precipitate

change in color

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NOT a Chemical Change:

crystalization

sublimation fluorescence

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more evidence of

a Chemical Change:

light

fire

http://webmineral.com/help/FlameTest.shtml

Flame Test

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Precipitate

formation of insoluble ionic compounds.

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You get up in the morning and make toast for breakfast. You notice the color changes from light to dark. Later on that day in science class, your teachers asks for every day examples of physical and chemical changes.

Should you volunteer your toast as an example of a physical or chemical change?

Why?

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