Q: What is the frequency ($\nu$) of light with a wavelength ($\lambda$) of $500\ \mathrm{nm}$? ($c = 3.00 \times 10^8\ \mathrm{m/s}$)

$6.00 \times 10^{14}\ \mathrm{Hz}$

Q: Calculate the energy of a photon with a wavelength of $400\ \mathrm{nm}$. ($h = 6.626 \times 10^{-34}\ \mathrm{J\cdot s}$, $c = 3.00 \times 10^8\ \mathrm{m/s}$)

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

Q: Using the de Broglie equation, what is the wavelength of an electron ($m = 9.11 \times 10^{-31}\ \mathrm{kg}$) moving at $2.0 \times 10^6\ \mathrm{m/s}$? ($h = 6.626 \times 10^{-34}\ \mathrm{J\cdot s}$)

$3.6 \times 10^{-10}\ \mathrm{m}$

Q: Calculate the energy change ($\Delta E$) for an electron in hydrogen moving from $n=3$ to $n=2$ using $E_n = -2.18 \times 10^{-18} (1/n^2)\ \mathrm{J}$.

$-4.57 \times 10^{-19}\ \mathrm{J}$

Q: If a photon with energy $5.0 \times 10^{-19}\ \mathrm{J}$ strikes a metal with binding energy $3.0 \times 10^{-19}\ \mathrm{J}$, what is the kinetic energy ($KE$) of the emitted electron?

$2.0 \times 10^{-19}\ \mathrm{J}$

Question 1

How many significant figures are in the measurement 0.00450?

Accepted Answer

3

Question 2

Calculate $3.45 	imes 2.1$ and report your answer with the correct number of significant figures.

Accepted Answer

$7.2$

Question 3

A sample has a mass of $25.0\ \mathrm{g}$ and a volume of $10.0\ \mathrm{mL}$. What is its density?

Accepted Answer

$2.50\ \mathrm{g/mL}$

Question 4

Convert $5.25$ miles to kilometers. (1 mile = 1.609 km)

Accepted Answer

$8.45\ \mathrm{km}$

Question 5

Which law is demonstrated if two samples of a compound always contain oxygen and hydrogen in a mass ratio of $2:1$?

Accepted Answer

Law of Definite Proportions

Question 6

An element has two isotopes: 60% at 10 amu and 40% at 11 amu. What is its average atomic mass?

Accepted Answer

$10.4\ \mathrm{amu}$

Question 7

How many moles are in $36.0\ \mathrm{g}$ of $\mathrm{H_2O}$? (Molar mass $= 18.0\ \mathrm{g/mol}$)

Accepted Answer

$2.0\ \mathrm{mol}$

Question 8

How many atoms are in $0.50$ moles of carbon?

Accepted Answer

$3.01 	imes 10^{23}$

Question 9

What is the frequency ($
u$) of light with a wavelength ($\lambda$) of $500\ \mathrm{nm}$? ($c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$6.00 	imes 10^{14}\ \mathrm{Hz}$

Question 10

Calculate the energy of a photon with a wavelength of $400\ \mathrm{nm}$. ($h = 6.626 	imes 10^{-34}\ \mathrm{J\cdot s}$, $c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

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

Question 11

Using the de Broglie equation, what is the wavelength of an electron ($m = 9.11 	imes 10^{-31}\ \mathrm{kg}$) moving at $2.0 	imes 10^6\ \mathrm{m/s}$? ($h = 6.626 	imes 10^{-34}\ \mathrm{J\cdot s}$)

Accepted Answer

$3.6 	imes 10^{-10}\ \mathrm{m}$

Question 12

Calculate the energy change ($\Delta E$) for an electron in hydrogen moving from $n=3$ to $n=2$ using $E_n = -2.18 	imes 10^{-18} (1/n^2)\ \mathrm{J}$.

Accepted Answer

$-4.57 	imes 10^{-19}\ \mathrm{J}$

Question 13

If a photon with energy $5.0 	imes 10^{-19}\ \mathrm{J}$ strikes a metal with binding energy $3.0 	imes 10^{-19}\ \mathrm{J}$, what is the kinetic energy ($KE$) of the emitted electron?

Accepted Answer

$2.0 	imes 10^{-19}\ \mathrm{J}$

Question 14

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$n=2,\ l=2,\ m_l=0,\ m_s=+1/2$

Question 15

If $l=2$, what are the possible values for $m_l$?

Accepted Answer

$-2, -1, 0, +1, +2$

Question 16

A metal has a density of $8.96\ \mathrm{g/mL}$. What mass of metal occupies $15.0\ \mathrm{mL}$?

Accepted Answer

$134\ \mathrm{g}$

Question 17

Which of the following best describes the law of multiple proportions?

Accepted Answer

When two elements form more than one compound, the masses of one element that combine with a fixed mass of the other are in ratios of small whole numbers.

Question 18

Which of the following conversions is correct for $2.50$ hours to seconds?

Accepted Answer

$9,000\ \mathrm{s}$

Question 19

Which transition in the hydrogen atom would result in the absorption of energy?

Accepted Answer

From $n=2$ to $n=5$

Step-by-Step Guidance for CHEMISTRY 106 Exam 1 Study Guide

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