Q: A sample of green light has a wavelength of $$525\ \text{nm}$$ and contains $$189\ \text{kJ} of $$energy. How many photons are present in the sample?

$$5.67 \times 10$$^{20}$$ photons

Q: Calculate the energy (in joules) of a photon of blue light emitted by a mercury lamp with a frequency of $$6.88 \times 10$$^{14}$$\ \text{Hz}.$$

$$4.56 \times 10$$^{-19}$$\ \text{J}$$

Q: A baseball (mass $$= 155\ \text{g}) is $$moving at $$32.5\ \text{m/s}. $$Calculate its wavelength.

$$1.26 \times 10$$^{-34}$$\ \text{m}$$

Q: Determine the energy change associated with the transition from $$n = 5 to$$ $$n = 2 in $$the hydrogen atom.

$$4.58 \times 10$$^{-19}$$\ \text{J}$$

Q: What mass (in mg) does 2.63 moles of nickel have? (Atomic mass of Ni = 58.69 g/mol)

$$1.54 \times 10$$^{5}$$\ \text{mg}$$

Question 1

Which of the following statements about the quantum numbers for an electron in an atom is CORRECT?

Accepted Answer

The magnetic quantum number $$m_l$$ describes the orientation of the orbital.

Question 2

A sample of green light has a wavelength of $$525\ 	ext{nm}$$ and contains $$189\ 	ext{kJ} of $$energy. How many photons are present in the sample?

Accepted Answer

$$5.67 	imes 10$$^{20}$$ photons

Question 3

Which of the following best describes the threshold frequency in the photoelectric effect?

Accepted Answer

The minimum frequency of incident light required to eject electrons from a metal surface.

Question 4

Calculate the energy (in joules) of a photon of blue light emitted by a mercury lamp with a frequency of $$6.88 	imes 10$$^{14}$$\ 	ext{Hz}.$$

Accepted Answer

$$4.56 	imes 10$$^{-19}$$\ 	ext{J}$$

Question 5

An atom has 12 protons, 14 neutrons, and 10 electrons. What is the symbol for this ion?

Accepted Answer

$$^{26}	ext{Mg}^{2+}$$

Question 6

A baseball (mass $$= 155\ 	ext{g}) is $$moving at $$32.5\ 	ext{m/s}. $$Calculate its wavelength.

Accepted Answer

$$1.26 	imes 10$$^{-34}$$\ 	ext{m}$$

Question 7

Which statement about electromagnetic radiation is correct?

Accepted Answer

As the energy increases the frequency increases.

Question 8

A new element was discovered and found to have an atomic weight of $$342.38\ 	ext{amu}. $$This element has two isotopes, the lighter of which has a mass of $$340.91\ 	ext{amu}$$ and an abundance of $$68.32\%. $$What is the mass of the heavier isotope?

Accepted Answer

$$346.27\ 	ext{amu}$$

Question 9

Which of the following is NOT a physical property?

Accepted Answer

The rusting of iron

Question 10

How many valence electrons does a nitrogen atom have?

Accepted Answer

5

Question 11

Which of the following transitions in a hydrogen atom represents emission of the shortest wavelength photon?

Accepted Answer

$$n = 5 \rightarrow n = 1$$

Question 12

Determine the energy change associated with the transition from $$n = 5 to$$ $$n = 2 in $$the hydrogen atom.

Accepted Answer

$$4.58 	imes 10$$^{-19}$$\ 	ext{J}$$

Question 13

Which of the following sets of quantum numbers is valid for an electron in an atom?

Accepted Answer

$$n = 2, l = 1, m_l = +1$$

Question 14

A person is 2.321 yards tall. How tall are they in centimeters? (1 yard = 3 feet; 1 foot = 12 inches; 1 inch = 2.54 cm)

Accepted Answer

212.2 cm

Question 15

How many neutrons does an atom of oxygen-15 have?

Accepted Answer

7

Question 16

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Air

Question 17

How many orbitals are contained in the third principal level ($$n = 3) of a $$given atom?

Accepted Answer

9

Question 18

Which of the following statements is TRUE?

Accepted Answer

All of the above are true.

Question 19

What mass (in mg) does 2.63 moles of nickel have? (Atomic mass of Ni = 58.69 g/mol)

Accepted Answer

$$1.54 	imes 10$$^{5}$$\ 	ext{mg}$$

General Chemistry: Atomic Structure, Properties, and Calculations – Study Guide

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