Q: A photon in the ultraviolet portion of the spectrum has a wavelength of 150 nm. What is the energy of this photon?

$8.27 \times 10^{-19}\ \mathrm{J}$

Question 1

Which of the following is the correct net ionic equation for the reaction of aqueous AgNO$_3$ with aqueous NaCl?

Accepted Answer

$\mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)}$

Question 2

A photon in the ultraviolet portion of the spectrum has a wavelength of 150 nm. What is the energy of this photon?

Accepted Answer

$8.27 	imes 10^{-19}\ \mathrm{J}$

Question 3

Which statement about the Heisenberg uncertainty principle is TRUE?

Accepted Answer

It states that we cannot know both the exact location and speed of an electron simultaneously.

Question 4

Given the reaction: $2\mathrm{KMnO_4} + 5\mathrm{H_2C_2O_4} + 8\mathrm{H_2SO_4} \rightarrow 2\mathrm{MnSO_4} + 10\mathrm{CO_2} + 8\mathrm{H_2O} + K_2SO_4$, how many moles of $\mathrm{K_2SO_4}$ are produced by allowing five moles each of $\mathrm{KMnO_4}$, $\mathrm{H_2C_2O_4}$, and $\mathrm{H_2SO_4}$ to react?

Accepted Answer

2.5 moles

Question 5

A 0.5 g sample of an unknown compound occupies 200 mL at 298 K and 1.22 atm. What is its molar mass?

Accepted Answer

$50.0\ \mathrm{g/mol}$

Question 6

Determine the binding energy per nucleon of an $\mathrm{Mg}$-24 nucleus. The $\mathrm{Mg}$-24 nucleus has a mass of $23.9850\ \mathrm{amu}$. A proton has a mass of $1.00728\ \mathrm{amu}$, a neutron has a mass of $1.00867\ \mathrm{amu}$, and $1\ \mathrm{amu}$ is equivalent to $931.5\ \mathrm{MeV}$ of energy.

Accepted Answer

$8.26\ \mathrm{MeV}$

Question 7

A graduate student found a leg bone of a large animal during the building of a new gym on campus. The bone had a carbon-14 activity of 0.13 disintegrations per minute per gram of carbon. Living bone has a carbon-14 activity of 15.3 disintegrations per minute per gram of carbon. The half-life of carbon-14 is 5730 years. How old is the bone?

Accepted Answer

$32,000\ \mathrm{years}$

Question 8

Which of the following compounds does NOT have hydrogen bonding?

Accepted Answer

$\mathrm{CH_3OCH_3}$

Question 9

A 40.0 mL sodium bromide solution has a bromide ion concentration of $0.245\ \mathrm{M}$. What is the mass of sodium bromide in the solution?

Accepted Answer

$1.27\ \mathrm{g}$

Question 10

Which intermolecular forces are present in $\mathrm{CH_3CH_2CH_2CH_2OH}$?

Accepted Answer

Hydrogen bonding, dipole-dipole, and London dispersion forces

Question 11

Which of the following statements is TRUE regarding the quantum numbers of electrons?

Accepted Answer

No two electrons in an atom can have the same set of four quantum numbers.

Question 12

Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. What is the average atomic mass of the element?

Isotope 1: 24.00 amu, 78.99%
Isotope 2: 25.00 amu, 10.00%
Isotope 3: 26.00 amu, 11.01%

Accepted Answer

$24.32\ \mathrm{amu}$

Question 13

Which of the following compounds contains a pi bond?

Accepted Answer

$\mathrm{C_2H_4}$

Question 14

Acetaminophen is a widely used and effective pain reliever. Identify the functional group circled in the structure below.

Accepted Answer

Amide

Question 15

Which combination of protons, neutrons, and electrons is correct for the isotope of copper $^{65}\mathrm{Cu}$?

Accepted Answer

29 protons, 36 neutrons, 29 electrons

Question 16

Consider the molecule below. Determine the molecular geometry of each of the two labeled carbons.

$\mathrm{F_2C=CH_2}$

C1 = leftmost carbon, C2 = rightmost carbon

Accepted Answer

C1 = trigonal planar, C2 = tetrahedral

Question 17

Using the following equation for the combustion of octane, calculate the heat associated with the formation of $100.0\ \mathrm{g}$ of carbon dioxide. The molar mass of octane is $114.23\ \mathrm{g/mol}$.

$2\mathrm{C_8H_{18}} + 25\mathrm{O_2} \rightarrow 16\mathrm{CO_2} + 18\mathrm{H_2O}$
$\Delta H = -11018\ \mathrm{kJ}$

Accepted Answer

$-1550\ \mathrm{kJ}$

Question 18

Which of the following processes is a chemical process?

Accepted Answer

Burning of wood

Question 19

Which of the following compounds is expected to have the highest boiling point?

Accepted Answer

$\mathrm{CH_3CH_2CH_2OH}$

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