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9/10 A DAY, 9/11 B DAY - Significant Figures & Scientific Notation, Atomic History & Structure, Light & Energy
How many Significant Figures are in the number 100.25?
five
How many Significant Figures are in the number 0.00340 ?
three
Round 45730.2 to three significant figures.
45700
Round 0.0035071 to two significant figures.
0.0035
What is 450,000 in scientific notation?
4.5 × 105
What is 0.000321 in scientific notation?
3.21 × 10-4
What charge do protons have and where are they located?
positively-charged, located in the nucleus
What charge do neutrons have and where are they located?
neutral (no charge), located in the nucleus
What charge do electrons have and where are they located?
negative charge, located outside the nucleus
What does the atomic number tell us?
the number of protons an element has
How do you find mass number?
the sum of protons and neutrons
How do you calculate average atomic mass?
Avg. Atomic Mass = (mass 1 x abundance 1) + (mass 2 x abundance 2) + …
repeat for however many isotopes there are. remember to convert your abundances to decimals before calculating (divide by 100 or move decimal two spaces to the left)
What were the four postulates of Dalton’s Atomic Theory?
all matter is made up of atoms
atoms of an element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
In chemical reactions, atoms are combined, separated, or rearranged.
What is the relationship between wavelength and frequency and energy?
An inverse relationship
long wavelength = low frequency = low energy
short wavelength = high frequency = high energy
What is the order of the electromagnetic spectrum from longest to shortest wavelength?
radio, microwave, infrared, visible, UV, x-ray, gamma
What is the order of the visible light spectrum from longest to shortest wavelength?
red, orange, yellow, green, blue, indigo, violet
the rainbow - ROY G BIV
What experiment did Rutherford conduct and what did he discover?
Gold Foil Experiment
discovered the positively-charged nucleus
What experiment did J.J. Thompson conduct and what did he discover?
Cathode Ray Tube Experiment
discovered electrons
Which atomic model did John Dalton create?
the Solid Sphere Model
Which atomic model did J.J Thompson create?
the Plum Pudding Model
Which atomic model did Rutherford create?
the Nuclear Model
Which atomic model did Bohr create?
the Planetary Model
Which atomic model did Schrödinger and Heisenberg create?
the Quantum (Cloud) Model
Note 
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