Q: If the frequency $(\nu)$ of light is $6.0\times 10^{14}\ \mathrm{Hz}$, what is its wavelength $(\lambda)$ in meters? (Speed of light $c = 2.998\times 10^8\ \mathrm{m/s}$)

$5.00\times 10^{-7}\ \mathrm{m}$

Q: Which of the following statements about the mole is correct?

A mole contains $6.022\times 10^{23}$ particles.

Q: A photon has a wavelength of $4.00\times 10^{-7}\ \mathrm{m}$. What is its energy? ($h = 6.626\times 10^{-34}\ \mathrm{J\cdot s}$, $c = 2.998\times 10^8\ \mathrm{m/s}$)

$4.97\times 10^{-19}\ \mathrm{J}$

Question 1

Which of the following best describes a sample of air at sea level?

Accepted Answer

A homogeneous mixture

Question 2

Which of the following is an example of a chemical change?

Accepted Answer

Rusting of iron

Question 3

A cube has sides of length $2.50\ \mathrm{cm}$. What is its volume in $\mathrm{mL}$?

Accepted Answer

$15.6\ \mathrm{cm}^3$ (which equals $15.6\ \mathrm{mL}$)

Question 4

Which of the following statements about the conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 5

Convert $0.0056\ \mathrm{kg}$ to $\mathrm{mg}$.

Accepted Answer

$5.6	imes 10^6\ \mathrm{mg}$

Question 6

Which of the following is an intensive property?

Accepted Answer

Density

Question 7

A sample contains $70\%$ $^{35}\mathrm{Cl}$ (mass $= 34.97\ \mathrm{amu}$) and $30\%$ $^{37}\mathrm{Cl}$ (mass $= 36.97\ \mathrm{amu}$). What is the average atomic mass of chlorine?

Accepted Answer

$35.50\ \mathrm{amu}$

Question 8

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 9

What is the correct nuclear symbol for an atom with 15 protons, 16 neutrons, and 15 electrons?

Accepted Answer

$^{31}_{15}\mathrm{P}$

Question 10

Which of the following best describes the difference between an orbit and an orbital?

Accepted Answer

An orbit is a fixed path around the nucleus, while an orbital is a region of space with a high probability of finding an electron.

Question 11

Which of the following electron configurations represents a neutral magnesium atom ($Z=12$)?

Accepted Answer

$1s^2\ 2s^2\ 2p^6\ 3s^2$

Question 12

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli exclusion principle

Question 13

A student measures the mass of a metal cylinder as $15.0\ \mathrm{g}$ and its volume as $3.0\ \mathrm{mL}$. What is the density of the metal?

Accepted Answer

$5.0\ \mathrm{g/mL}$

Question 14

Which of the following electromagnetic waves has the highest frequency?

Accepted Answer

Gamma rays

Question 15

If the frequency $(
u)$ of light is $6.0	imes 10^{14}\ \mathrm{Hz}$, what is its wavelength $(\lambda)$ in meters? (Speed of light $c = 2.998	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$5.00	imes 10^{-7}\ \mathrm{m}$

Question 16

Which of the following is the correct noble gas configuration for potassium ($Z=19$)?

Accepted Answer

$[Ar]\ 4s^1$

Question 17

Which of the following statements about the mole is correct?

Accepted Answer

A mole contains $6.022	imes 10^{23}$ particles.

Question 18

Which element is a halogen?

Accepted Answer

Chlorine

Question 19

Which of the following best explains why atomic radii decrease across a period from left to right?

Accepted Answer

The effective nuclear charge increases, pulling electrons closer to the nucleus.

Question 20

A photon has a wavelength of $4.00	imes 10^{-7}\ \mathrm{m}$. What is its energy? ($h = 6.626	imes 10^{-34}\ \mathrm{J\cdot s}$, $c = 2.998	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$4.97	imes 10^{-19}\ \mathrm{J}$

CHEM 108 Exam 1 Study Guide: Foundations of Chemistry, Atomic Structure, and the Periodic Table

Study Guide - Practice Questions

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