LaunchPlace homework on desk

Quiz Reflection Worksheet9/8 Practice Questions – drawing and table

Answer the following four questions in complete sentences:1.Where is the nucleus located?

2.What subatomic particles are found in the nucleus?

3.Where are the rings located?

4.What subatomic particle is found in the rings?

How is the atom structured?

Part IIMr. HeffnerChemistry

9/9/09

How is the atom structured?

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Rings •Protons•Nuetrons•Electrons

How is the atom structured?

Subatomic Particle

Charge Mass Location

Proton +1 1 amu Nucleus

Neutron No charge

1 amu Nucleus

Electron -1 ~0 amu Rings

How is the atom structured?

Size comparison: nucleus vs. rings

The nucleusReally small

The ringsReally large

How is the atom structured?

Size comparison: nucleus vs. rings

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How do we know?Ernest Rutherford: Gold Foil Experiment

Fired particles at a thin sheet of gold foil

How do we know?Ernest Rutherford: Gold Foil Experiment

Hypothesis: all will travel straight through

Test: Rutherford's Gold Foil Experiment

Results:98% went straight through2% went through but were deflected~0.01% bounced backwards

Concluded that the nucleus is small and dense

What is the density of the nucleus?

Nucleus has a large massProtons and neutrons (both weight 1 amu)

Nucleus has a small volume

Large Mass

Small Volume= Very Dense!

What is the density of the rings?Rings have a small mass

Electrons (weighs ~0 amu)

Rings have a large volumeMostly empty space

Small Mass

Large Volume= Not Dense

8-way FoldableOn the top of the flaps write the following:

Density of nucleus (dense: large in mass, small in volume)

Density of rings (not dense: small in mass, large in volume)

Atom (draw a small picture) Proton (charge, mass, location) Neutron (charge, mass, location) Electron (charge, mass, location) Nucleus (draw a small picture with charges) Rings (draw a small picture with charges)

If you finish early quiz yourself!

Practice Questions1. Which is more dense, the nucleus or the rings?

2. Re-write the below statements with the correct words:

The nucleus is ___________ (small/large) in mass and __________ (small/large) in volume, meaning it is __________ (dense/not dense)

The rings are ___________ (small/large) in mass and __________ (small/large) in volume, meaning it is __________ (dense/not dense)

3. What did Rutherford’s experiments prove about the nucleus?

Exit Slip1. Which subatomic particles are found in the nucleus?

a. protons

b. neutrons

c. electrons

d. both a & b

2. The rings are

a. small in volume

b. large in mass

c. small in mass

d. none of the above

Exit Slip3. What is the correct relationship between the nucleus and

the rings?a. the nucleus is more dense than the ringsb. the nucleus is less dense than the ringsc. the nucleus and the rings are equally densed. the nucleus and the rings both contain protons

4. Which of the following correctly describes the nucleus?a. It contains almost all of the atom’s mass.b. It is the location where protons and electrons are found.c. It is very large in volume.d. It is on the outside edge of the atom.

Exit Slip5. Rutherford’s experiments using alpha particles

shot at gold foil proved that the nucleus of an atom

a. is made of protonsb. is small and is the densest part of the atomc. is almost as big as the rings surrounding itd. occupies most of the atoms space

HomeworkMake sure you binder is put together just in case

we have a random “Binder Check” later this weekRemember: one person can let the whole team

down!

Finish Practice Questions and Foldable

Study for the Unit #1 Exam!