Significant Figures
Dimensional Analysis
Subatomic Particles
Electron Orbitals
History of the Atom
100

How many significant figures in 1.0500

5

100

How many inches are in 4 ft.

12 in = 1 ft

48 in

100

What are the 3 subatomic particles in an atom?

Neutron, Electron, Proton

100

When does an electron release energy?

When it goes back to its original orbital after getting excited.

100

Describe the first atomic model.

Dalton's model: A hard sphere

200

Have many significant figures are in 0.00000000012050

5

200

Each dimensional analysis problem has taken you 1.5 minutes to complete. How many dimensional analysis problems could you complete in 6 weeks of chemistry class?

1 period = 50 min 


50/1.5 = 33.3

33.3*5 = 166.66

166.66*6 = 1000

1000 dimensional analysis problems

200

What is the charge of the nucleus. Explain

Positive because Protons are positive and Neutrons have no charge.

200

Write the electron configuration of an excited atom of Phosphorus.

2-7-6

200

Describe the Wave-Mechanical model, in your own words.

The wave mechanical model has a positively charged nucleus, with an electron cloud around it, because we don't know the exact location of the electrons.

300

Solve the following equation to the correct number of significant figures: 0.1204/0.00004

3000

300

Find the density of 4000 mg of Mg metal in 4 ml of water in the units g/cm^3

1000 mg = 1 g

1 ml = 1 cm^3

1 g/cm^3

300

Using your CRT, determine the number of Protons, Neutrons, and Electrons in a neutral atom of Sulfur-34.

16 protons, 18 neutrons, and 16 electrons

300
In the ground state, which atom has a filled valence shell?


1) C                              2) V

3) Ne                            4) Sb

3) Ne

300

What was Rutherford's experiment and what did he discover?

He shot Alpha particles into gold foil and found out that the atom is mostly empty space with a positively charged nucleus. The alpha-particles mostly went through except for when it bounced off when it hit the center.

400
How many significant figures are in the answer of : 4.060 + 5.2 + 0.000976

Answer: 9.3 which has 2 sig-figs

400

A car is traveling down a highway at a speed of 52 miles per hour. What would this speed be in units of meters per second?

1 mile = 1.609 km        1 km = 1000 m

1 hour = 60 min            1 min = 60 sec


52/1.609 = 32.3 meters

60*60 = 120 sec

Answer: 32.3 meters/120 sec

400

Determine the number of neutrons in a neutral isotope of Potassium-41.

22 neutrons

400

What color would be emitted if an electron relaxed from the fourth shell to the third shell? Explain

1) Red.                            2) Yellow

3) Blue.                           4) Purple

Red, because it was a small jump back to its original shell.

400

List the 5 atomic models in order.

Daltan's Model, Thomson's Plum Pudding Model, Rutherford's Model, Bohr's Planetary Mode, Schrodinger's Wave Mechanical Model

500

Solve the following in the correct number of sig-figs: [(40.64+0.213+65.1) * 41)

106.0*41 = 4300

500

John can read 15 pages of a book every 45 minutes. How many hours will it take him to read the entire 200 page book?

1 hr = 60 min

45/60 = 0.75 hr

200/15 = 13

13*0.75 = 10 hrs

500
Compare and contrast the two stable, neutral isotopes of Nitrogen: Nitrogen-14 and Nitrogen-15, in terms of their subatomic particles.

They have 7 protons and electrons. Nitrogen-14 has 7 neutrons and Nitrogen-15 has 8 neutrons.

500

Write an electron configuration for ground state Aluminum and excited state Aluminum.

Ground State: 2-8-3

Excited State: 2-7-4

500

Describe how the atom changed over time. 

The atom started off as a hard sphere, and then Thompson discovered that there are small negatively charged particles in an atom. Through Rutherford's gold foil experiment, we determined that the atom was mostly empty space except for a postively charged nucleus. Bohr then discovered that the electrons were in shells around the nucleus. Finally, the modern atom has a positively charged nucleus with an electron cloud.

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