Atomic Theory

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Slide 163

Ag + Cl2 AgCl

Total

atoms

1

2

1

1

Both sides must be equal

for ALL atoms.

Slide 164

Physical

Reaction Types

No change in atoms / molecules

phase change (gas, liquid, solid)

light emission/absorption

Dissolving

Electrons passing through metals

Slide 165

Pure substance Mixture

Slide 166

Pure substance vs. Mixture

Only ONE element has 2 or more

or compound. elements/

(distilled water) compounds.

Slide 167

A chocolate chip cookie is an example of a _, because .

a. compound, the ingredients are chemically bonded.

b. compound, it is the same throughout.

c. mixture, you can separate out the chips.

d. mixture, you cannot distinguish between the ingredients.

Slide 168

Distilled water

Slide 169

Air is a mixture of several gases.

Name Formula amount

Nitrogen N2 78 %

Oxygen O2 21 %

Argon Ar 1 %

Carbon CO2 0.03 %

Dioxide

Slide 170

Air is a mixture of several gases

Name Formula amount

Neon Ne 0.002 %

Methane CH4 0.0002 %

Helium He 0.000524 %

Krypton Kr 0.000114 %

Hydrogen H2 0.00005 %

Xenon Xe 0.0000087 %

Noble (inert) Gas

Slide 171

Nitrogen, Oxygen and Helium are pure substances in a gaseous state.

Slide 172

Atoms are NOT the same as molecules.

Air and oxygen are NOT the same.

Helium and hot air are NOT the same.

Slide 173

Helium and hot air are NOT the same.

Slide 174

Diffusion

the natural mixing of two substances. It is caused by random molecular motion.

Slide 175

Beta Particle

(Electron)

Positron

emission

Radioactivity

Alpha

Particle

unstable

nucleus

Gamma Particle

(light)

Slide 176