Exam 1 FlashCards
What is the purpose of scientific notation?
To represent very large or small numbers
How do you convert large numbers to scientific notation?
Move the decimal (at the very end) to the front
To the left
What is Avogradro’s number?
6.23x10^23
How do you convert very small numbers to scientific notation?
Move the decimal to the right
What are the seven base SI units?
Mass, Length, Time, Temperature, Electric Current, Light, Amount of Matter
What does the Atomic Number represent and how do you find it>
It counts the amount of protons
What was the original purpose of the atomic symbols?
To keep things mysterious, and mystical
What does the mass number represent
The number of protons AND neutrons
Define Isotopes
Atoms with the same number of protons, but different number of neutrons
Define Anion
Net neg. charged atom due to an excess of electrons
Define Cation
Net pos. charged atoms due to an deficiency of electrons
Define Electromagnetic Radiation
The probe that was used to determine the arrangement of electrons around atoms
What is another word for electromagnetic radiation
Light
What is the symbol for wavelength
What is the symbol for frequency
v
What is the symbol for the speed of light?
c
When frequency increases, what happens to the wavelength
it decreases
When frequency decreases, what happens to the wavelength
it increases
Define Frequency
The number of waves which pass in a second
What is the constant for the speed of light (c)
3 x 10^8
If the density increases, does light travel go faster or slower?
slower
List the electromagnetic spectrum from lowest to highest frequency (or highest to lowest wavelength)
1) AM RADIO
2) TV / FM
3) Microwave
4) Radar
5) Infrared Light
6) Visible Light
7) Ultra Violet Light
8) X-ray
9) Gamma ray
What is the visible light spectrum?
The very small portion of electromagnatic spectrum that we can see
What does the ROYGBV order
The colors from long wavelength to short wavelength
What is energy proportional to
Frequency
Define Photon
The energy of light that travels through space in concentrated bundles
what is the symbol for planck’s constant
h
What is the number of planck’s constant
6.626 x 10^-34
As frequency increases, what happens to energy
it increases
As wavelength increases, what happens to energy
it decreases
What is the Si unit for matter?
mole
