Q: A photon has a frequency of $$6.0 \times 10$$^{14}$$\ \mathrm{Hz}. $$What is its energy? $$(h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s})$$

$$3.98 \times 10$$^{-19}$$\ \mathrm{J}$$

Question 1

Which of the following statements best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 2

A chlorine sample contains two isotopes: $$^{35}\mathrm{Cl} ($$mass = 34.97 amu, abundance = 75.76%) and $$^{37}\mathrm{Cl} ($$mass = 36.97 amu, abundance = 24.24%). What is the atomic mass of chlorine?

Accepted Answer

$$35.45$$ amu

Question 3

Which equation correctly relates the speed of light $$(c)$$, wavelength $$(\lambda)$$, and frequency $$(
u) of $$electromagnetic radiation?

Accepted Answer

$$c = \lambda 
u$$

Question 4

How many neutrons are in an atom of $$^{56}\mathrm{Fe}$$?

Accepted Answer

30

Question 5

Which of the following best explains why the atomic mass of chlorine is not a whole number?

Accepted Answer

It is the weighted average of the masses of all naturally occurring isotopes.

Question 6

Which principle states that each orbital can hold a maximum of two electrons with opposite spins?

Accepted Answer

Pauli exclusion principle

Question 7

What is the maximum number of electrons that can occupy the $$3p$$ sublevel?

Accepted Answer

6

Question 8

Which of the following electron configurations represents a noble gas?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$

Question 9

A photon has a frequency of $$6.0 	imes 10$$^{14}$$\ \mathrm{Hz}. $$What is its energy? $$(h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$3.98 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 10

Which of the following best describes the difference between the $$2s$$ and $$2p$$ orbitals?

Accepted Answer

$$2s is $$spherical, $$2p is $$dumbbell-shaped

Question 11

Which element has the electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^4$$?

Accepted Answer

Sulfur

Question 12

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its mass number?

Accepted Answer

35

Question 13

Which of the following transitions would emit the most energy in a hydrogen atom?

Accepted Answer

From $$n=2 to$$ $$n=1$$

Question 14

How many valence electrons does an atom of phosphorus have?

Accepted Answer

5

Question 15

Which of the following is true about the $$4d$$ sublevel?

Accepted Answer

It can hold a maximum of 10 electrons.

Question 16

Which of the following best describes the relationship between energy and frequency for electromagnetic radiation?

Accepted Answer

Energy is directly proportional to frequency.

Question 17

Which of the following elements is a noble gas?

Accepted Answer

Neon

Question 18

Which of the following is the correct order of increasing energy for sublevels in an energy level?

Accepted Answer

$$s \u003c p \u003c d \u003c f$$

Question 19

If an atom has an atomic number of 12 and a mass number of 25, how many neutrons does it have?

Accepted Answer

13

Question 20

Which of the following best describes a photon?

Accepted Answer

A packet of energy that travels at the speed of light

Isotopes, Atomic Mass, and Atomic Structure: Study Notes for General Chemistry

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