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Atomic Theory
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Molecule

Molecule

Two or more atoms bonded together.

Compound Complex

A molecule with more than one element.

Slide 139

Common chemicals

Common chemicals

H2O2

NH3

NaOH

NaClO

I2

Compound o molecule ?

Slide 140

Combustibility

Combustibility

The tendency to react with Oxygen O2 .

Slide 141

H + O2

H + O2

C + O2

N + O2

O + O2

Si + O2

Fe + O2

Common Oxides

H2O

NO2

CO2

O3

SiO2

Fe2O3

Compound o molecule ?

Slide 142

Reaction Types

Reaction Types

Nuclear

Chemical

Physical

Protons

&

Neutrons

change

Bonds

made/ broken

Electrons exchanged

No change in atoms

phase change

light emission/ absorption

Slide 143

Nuclear

Nuclear

Reaction Types

Change in the

Gain or lose Protons , Neutrons,

Alpha, Beta particle

Fission, Fusion, Radiation

Proton Neutron

nucleus

Slide 144

Reaction Types

Slide 145

Chemical

Chemical

Reaction Types

Bonds are made / broken

Change in oxidation states

Plasma

P+1

P+1

2

1

Li

+1

Slide 146

evidence of Chemical Change:

evidence of Chemical Change:

development of a gas

formation of precipitate

change in color

Slide 147

NOT a Chemical Change:

NOT a Chemical Change:

crystalization

sublimation fluorescence

Slide 148

more evidence of

more evidence of

a Chemical Change:

light

fire

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

Flame Test

Slide 149

Precipitate

Precipitate

formation of insoluble ionic compounds.

Slide 150

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.

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?

Slide 151

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