ENERGY
what are the base units for wavelength?
nm
Which of the following is most electronegative:
A: Ca
B: Al
C: Ar
D: F
F
what is avogadro's number?
6.02 X 10^23 units
TRUE OR FALSE: Halogens have a -2 charge
FALSE
TRUE OR FALSE: Plank's constant is 3.00 x 10^8
FALSE
How many protons, neutrons, and electrons does potassium-40 have?
19 protons, 21 neutrons, 19 electrons
How many moles are in 15 g of Li?
2.2 mol
What is 10785743 written in scientific notation (3 sig figs only please)?
1.08 x 10^7
For a given wave, the wavelength is 495 m. What is the Energy of the wave?
1.9878*10^-25
write the electron configuration of Molybdenum (Mo) and give its quantum numbers
[Kr] 5s1 4d5
n = 4 ℓ = 2 mℓ = 2 ms = +½
How many grams are in 4.5 moles of sodium fluoride, NaF?
188.96 g NaF
Explain why Sulfur has a smaller atomic radius than Silicon using effective nuclear charge.
Use shielding and number of protons in explanation, not just periodic trend
Calculate the energy of a photon in a light beam with a wavelength of 24 um.
8.28 x 10^-21
Write the full (unabbreviated) electron configuration for Cu
1s22s22p63s23p64s13d10
What is the molar mass of H2O2?
34.02 g
Which of the following is not a physical process?
A: melting
B: filtration
C: evaporation
D:none of the above
none of the above
what is the frequency of a 5.6 X 10^10 um wave?
5.36 X 10^3 s-1
Identify the element whose last electron would have these 4 quantum numbers:
3, 1, -1, +1/2__________
4, 3, +3, -1/2___________
4, 2, +1, +1/2__________
2, 1, +1, -1/2___________
Al
Lu
Mo
Ne
Calculate the number of molecules in 1.058 mole of H2O
6.371 x 1023 molecules
Calculate the average atomic mass of sulfur, based on the following data:
(use 3 sig figs in your answer)
S-31.972 95.00%
S- 32.971 0.76%
S- 33.967 4.22%
32.1 amu