Metric Conversions
Convert 4750 mg to grams.
What is 4.750 g?
How many moles are in 12.0 g of NaCl (molar mass 58.44 g/mol)?
What is about 0.205 mol?
Which statement is TRUE about wavelength and frequency?
A) As wavelength increases, frequency increases.
B) As wavelength increases, frequency decreases.
C) Wavelength and frequency are unrelated.
D) Higher frequency means lower energy.
What is B?
True or False: The emission spectrum of a particular element is always the same and can be used to identify the element.
What is True?
This quantum number specifies the subshell, or the shape of the orbital.
What is l, the angular momentum quantum number?
A reaction requires 0.085 L of solution. How many mL is this?
What is 85 mL?
What is the mass, in grams, of 0.750 mol of CO₂ (molar mass 44.01 g/mol)?
What is about 33.0 g?
What is 4.00 mol O? (2 O atoms per CO₂)
What is about 4.62 × 10⁻⁵ m (461.5 nm)?
This term names the lowest-energy state of an electron, and this is its principal quantum number.
What is the ground state, n = 1?
Label this set of quantum numbers Valid or Invalid, and explain: n=2, l=2, mₖ=0
What is Invalid — l must be less than n (allowed values of l are 0 to n−1), so l=2 is not allowed when n=2?
Convert 2.5 × 10⁻³ km to cm.
What is 250 cm? (2.5×10⁻³ km → 2.5 m → 250 cm)
How many atoms are in 0.500 mol of iron?
What is about 3.01 × 10²³ atoms?
A laser emits light with a wavelength of 532 nm. What is the frequency of this light?
What is about 5.64 × 10¹⁴ Hz?
The H atom and the He⁺ ion each have one electron. Based on the Bohr model, would you expect their line spectra to be identical? Explain.
What is No — He⁺ has a nuclear charge of Z=2 instead of Z=1, so its energy levels (and the resulting wavelengths) are scaled differently, even though both are one-electron systems?
What is the maximum number of orbitals with n=4, l=2?
What is 5? (number of orbitals = 2l+1)
A liquid has a density of 3.40 g/mL. What is this density in kg/L?
What is 3.40 kg/L? (g/mL and kg/L are numerically equal)
A sample contains 3.01 × 10²³ molecules of O₂. How many moles is this?
What is about 0.500 mol?
Calculate the energy of a photon of radiation with a frequency of 7.20 × 10¹⁴ Hz.
What is about 4.77 × 10⁻¹⁹ J?
Calculate the wavelength (in nm) corresponding to the n=3 to n=1 transition in a hydrogen atom.
What is about 102.6 nm?
How many electrons in an atom can have the quantum numbers n=3, l=1, mₛ=+1/2?
What is 3? (one electron per each of the three 3p orbitals can have spin +1/2)
A car travels at 22.0 m/s. What is this speed in km/h?
What is 79.2 km/h?
How many moles of oxygen atoms are in 2.00 mol of CO₂?
What is 4.00 mol O? (2 O atoms per CO₂)
The wavelength of light that has a frequency of 2.40 × 10¹³ s⁻¹ is ______ m.
What is 1.25 × 10⁻⁵ m?
Calculate the wavelength (in nm) corresponding to the n=2 to n=6 transition in a hydrogen atom.
What is about 410.6 nm?
Give a valid set of four quantum numbers (n, l, mₖ, mₛ) for an electron in a 4d orbital.
What is n=4, l=2, mₖ= any of −2, −1, 0, +1, +2, mₛ=+1/2 or −1/2? (example: 4, 2, 0, +1/2)