Atomic Theory
The scientist that discovered the electron.
Who is J.J. Thomson?
6.02 x 1023 atoms, ions or particles of anything
What is a mole?
or
What is Avogadro's number?
The color of visible light with the least amount of energy.
What is red light?
Atoms of the same element that have different numbers of neutrons.
What are isotopes?
Has distinct phases or visible components
What is a heterogeneous mixture?
The scientist who discovered the atomic nucleus from his Gold Foil experiment.
Who is Ernest Rutherford?
The atomic mass of an element or compound expressed in grams/mol.
What is the molar mass of an element or compound?
EM radiation that is used in Thermal Imaging cameras.
What is Infrared or IR?
The atomic number of an element tells us this.
What is the number of protons?
Pure substances.
What are elements or compounds?
The principle that was proposed by Werner Heisenberg.
What is the Uncertainty Principle?
The formula for determining the concentration of a solution.
What is moles/liters?
M = mol/L
A type of EM radiation given off by the sun or used in tanning beds.
What is ultraviolet or UV?
Each orbital of equal energy must receive one electron before adding a second one according to this rule.
What is Hund's Rule?
When a substance melts, it is an example of this type of change. This type of change can be reversed.
What is a physical change?
Scientist who believed that electrons travel in "orbits".
Who is Niels Bohr?
The molarity of a solution having 0.500 moles of a solute dissolved in 2.50 liters of solution.
What is 0.200 M?
This is the most powerful form of EM radiation.
What are gamma rays?
(or cosmic rays?)
An outer shell electron that is associated with an atom.
What is a valence electron?
Flammability is an example of this.
What is a chemical property?
This Greek philosopher used the term "atomos" to describe the smallest piece of matter.
Who is Democritus?
12.011 g/mol
What is the molar mass of Carbon?
In an electromagnetic wave, when the frequency increases this measurement decreases.
What is wavelength?
How the average atomic mass is calculated for an element.
What is a weighted average of all known isotopes?
Iron rusting.
What is an example of a chemical change?