Q: Calculate the energy of one mole of photons with a frequency of $$15.42$$ MHz. (Planck constant $$h = 6.626 \times 10$$^{-34}$$ J·s, Avogadro's number N_A = 6.022$$ \times $$10^{23}$$ mol$$^{-1})$$

$$6.15 \times 10$$^{-5}$$ kJ/mol

Question 1

Which of the following statements about the 4p atomic orbital is correct?

Accepted Answer

It can hold a maximum of 2 electrons with opposite spins.

Question 2

How many orbitals of the 4p type exist in the fourth shell?

Accepted Answer

$$3$$

Question 3

Which of the following elements has the same number of valence electrons as selenium (Se)?

Accepted Answer

Te

Question 4

A student writes the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$ $$3d^{10}$$ $$4s^2$$ $$4p^5. $$Which element does this configuration represent?

Accepted Answer

Bromine

Question 5

Which of the following is the correct noble gas notation for the ground state electron configuration of molybdenum (Mo)?

Accepted Answer

$$[Kr] 5s^1$ 4d^5$

Question 6

Arrange the following ions in order of increasing radius: $$K^+$$, $$Ca^{2+}$$, $$Al^{3+}$$, $$S^{2-}.$$

Accepted Answer

$$Al^{3+}$$ \u003c $$Ca^{2+}$$ \u003c K^+ \u003c $$S^{2-}$$

Question 7

Which atom has a higher effective nuclear charge ($$Z_{eff}) $$than sulfur?

Accepted Answer

Chlorine

Question 8

Which atom has a larger first ionization energy than bromine?

Accepted Answer

Fluorine

Question 9

A radio wave has a frequency of $$15.42$$ MHz. What is its wavelength in meters? (Speed of light $$c = 2.998 	imes 10^8$ m/s)

Accepted Answer

$$19.44 m$$

Question 10

Calculate the energy of one mole of photons with a frequency of $$15.42$$ MHz. (Planck constant $$h = 6.626 	imes 10$$^{-34}$$ J·s, Avogadro's number N_A = 6.022$$ 	imes $$10^{23}$$ mol$$^{-1})$$

Accepted Answer

$$6.15 	imes 10$$^{-5}$$ kJ/mol

Question 11

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 12

Which of the following quantities are the same for the isotopes of hydrogen? Select all that apply.

Accepted Answer

Atomic number and nuclear charge

Question 13

Given the isotopic abundances of sulfur ($$^{32}S$$: 94.9%, $$^{34}S$$: 4.76%), what is the average atomic mass of sulfur to four decimal places?

Accepted Answer

$$32.07$$ amu

Question 14

A mass spectrum of H$$_2S $$shows two main peaks at $$m/z = 34$$ and $$m/z = 36. $$Which isotopes are present in the most abundant and next most abundant types of H$$_2S $$molecules?

Accepted Answer

$$^{32}S$$ for $$m/z = 34$$ and $$^{34}S$$ for $$m/z = 36$$

Question 15

If you have a sample of 1000 H$$_2S $$molecules, how many of these molecules would have a mass equal to $$34.082$$ amu (rounded to the nearest whole number)? (Given $$^{32}S is 94.9$$% abundant)

Accepted Answer

$$949$$

Question 16

Which of the following statements about electron configurations is accurate?

Accepted Answer

In the ground state, all electrons in the fourth shell experience the weakest attractions to the nucleus.

Question 17

How many orbitals are occupied in the ground state configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$?

Accepted Answer

$$9$$

Question 18

Which neutral atom is represented by the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^6$$?

Accepted Answer

Argon

Question 19

In an excited state configuration of argon, how many orbitals contain unpaired electrons?

Accepted Answer

$$1$$

General Chemistry Study Guide: Atomic Structure, Electron Configuration, Periodic Trends, and Isotopes

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