Basics/Concentration
Identify the element symbol and the number of protons, neutrons, and electrons.
Charge - +1
Atomic Mass - 72
Ge
Protons - 32
Neutrons - 40
Electrons - 31
Describe the relationship between wavelength and frequency.
Inverse
Is absorption a positive or negative?
positive
Name this: Mg2N3
Magnesium nitride
Electron configuration of Sodium
1s2 2s2 2p6 3s1
What is the molar mass of iodine?
126.9 g/mol
Calculate the wavelength (in cm) of a photon with an energy of 7.45×10^−22kJ.
2.67 x 10^-5 cm
An electron in a hydrogen atom jumps from n=1 to n=7.
What is the energy of the photon (J)?
2.14 x 10^-18 J
Name this: KF
potassium fluoride
electron configuration of potassium
1s2 2s2 2p6 3s2 3p6 4s1
How many atoms are in 32.7 moles of sulfur?
1.97 x 10^25 atoms S
What is the frequency of a photon with an energy of 4.75×10−19J?
7.17 x 10^14 Hz
When an electron in a hydrogen atom falls from n=4 to n=2, what is the wavelength (nm) of the emitted photon?
486 nm
What is the empirical formula of calcium oxide?
CaO
electron configuration of bromine
1s2 2s2 2p6 3s2 3p6 4s2 3d10 3p5
How many molecules of sodium chloride are in a 0.5M solution of 10L?
3.011 x 10^24 NaCl molecules
Calculate the wavelength in nanometers of a photon with an energy of 3.28×10−19J.
605 nm
When an electron in a hydrogen atom falls from n=6 to n=2, what is the wavelength (nm) of the emitted photon? What color of light is this?
410 nm - violet
what is the empirical formula of lithium sulfide?
electron configuration of O^2-
1s2 2s2 2p6
Toxin A has a lethal dose of 15 μg/kg, measured in mice. Its molar mass is 85,000 g·mol⁻¹. How many molecules of Toxin A would it take to kill a 0.03 kg mouse?
3.19 x 10^12 molecules
A solution has a molar absorptivity ε=2.10×103 1/M*cm, a concentration of 0.025 M, and a path length of 1.00 cm. What is the absorbance?
52.5
A photon of light with a wavelength of 410 nm, causes an electron in a Hydrogen atom to jump from the n=2 to a higher-energy orbital.
Determine the final n of the electron.
Indicate whether this process is absorption or emission.
n=6; absorption
ammonium sulfate
electron configuration of Fe^2+
1s2 2s2 2p6 3s2 3p6 4s2 3d4