Quantum #s & Orbitals
how many electrons can exist in one orbital?
2
What is the molarity of a solution containing 2 moles of NaCl dissolved in 4 liters of water
0.5M
What are the rows and columns called in the Periodic Table?
Rows: Periods
Columns: Groups
What is wavelength?
Distance between 2 consecutive peaks in a wave.
What law states that in chemical and nuclear reactions, the total mass of the reactants must be equal to the total mass of the products?
The Law of conservation of Mass
How many orbitals exist in a p subshell?
3
How many moles of water are created when 2 moles of of H2 react with excess O2?
In what directions of the periodic table does atomic radius increase?
Right to left (across period)
Top to bottom (down group)
What equation relates the speed of light (c), wavelength (λ), and frequency (ν).
c=λ/v
Why do we have to fill in orbitals in order?
Aufbau Principle
If a given orbital has quantum numbers of n=3 and l=2, what are all possible values for ml?
-2,-1,0,1,2
The number of grams of KCl needed to prepare 1 liter of a 0.5 M solution. (Molar mass of KCl = 74.55 g/mol)
37.28 grams
Why does atomic radius decrease as you move from left to right across a period of the PT?
What is the speed of light in a vacuum?
3.000x 108 m/s
What rule states that no two electrons in an atom can have the same set of four quantum numbers?
Pauli Exclusion Principle
What is the electron configuration of oxygen?
1s2 2s2 2p4
The pressure exerted by 3 moles of gas in a 5-liter container at 298 K using the ideal gas law R= 0.0821atmxL/molxK
14.7atm
Which element in group 16 has the smallest atomic radius?
O
The energy (in Joules) of a photon with a frequency of
6.0x1014Hz. When h= 6.626x10-34J
3.98x10-19J
What number is this and why is it important?
6.023x1023
Avogadro's number, it tells us the number of ~things~ in a mole.
What orbital corresponds to the quantum numbers n=2 l=1 and ml=-1
2p orbital
Cl has 2 isotopes 35Cl (34.9689 amu) and 37Cl (36.9659 amu). If the average atomic mass is 35.453 amu what is the percent abundance of each isotope?
25Cl= 75.75%
27Cl = 24.25%
What trends explain why elements at the bottom of Group 1 are more reactive than those at the top.
increased atomic radius & lower ionization energy
What rule states that electrons will fill degenerate orbitals singly before pairing up
Hunds rule