Unit 1
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AMU
Atomic Mass Units (u) the measurement of mass for elements 1 = ABOUT a proton/neutron - don’t count on this
molar mass
the mass of an element - measured by g/mol
Groups on a Periodic Table
the columns
Periods
the horizontal rows
Group 1A/1
Alkali Metals
Groupe 2A/2
Alkaline Earth Metals
Group b/3-12
Transition Metals
Group 7A/17
Halogens
Group 8A/18
Noble Gases
How do you determine the element?
The number of protons
Isotopes
a different number of neutrons
mass spectometry
a graph which has the mass and abundance of a certain element
Average Molar Mass Calculation
{(amu x % composition) …+…+(amu x %composition)}
Mole
6.022 x 10^23
Combined Gas Law
PV = nRT
What does R stand for in the Gas Law?
0.0821 L atm / mol K
What is the Standard Temperature and Pressure (STP)
P = 1 atm T = 273 K (Moles = Volume / 22.4 L/mol)
Molarity (M)
the measurement of calculation (moles)/(volume)
What is THAT Molarity equation
M1V1 = M2V2
Empirical Formula
the Ratio
Molecular Formula
the actual composition of an element
What are electrons energy like?
they are QUANTIZED. the farther they are from the nucleus, the higher their potential energy
Electromagnetic Radiation
energy in the form of waves
When an electron goes from a high energy level to a low energy level, it….
emits energy