Q: What is the frequency of light with a wavelength of $3.3 \times 10^{-7} \mathrm{m}$?

$4.98 \times 10^{14} \mathrm{s}^{-1}$

Question 1

A student is given 1.00 g samples of Na2O, MgO, and CaO. Which compound contains the greatest number of moles of oxygen atoms?

Accepted Answer

MgO

Question 2

Which of the following best explains why the first ionization energy of F is much higher than that of O?

Accepted Answer

F has more protons, resulting in a stronger nuclear attraction

Question 3

Given the electron configurations below, which element would have the largest jump in ionization energy after the removal of its second electron?

Accepted Answer

$\mathrm{Y}: 1s^2 2s^2 2p^6 3s^1$

Question 4

The mass spectrum of the element Sn is most likely represented by which of the following?

Accepted Answer

Multiple peaks with the average mass closest to 121.76 g

Question 5

Which of the following corresponds to the molar mass of oxygen element in Cr2O3?

Accepted Answer

$47.997 \mathrm{g}$

Question 6

Which electron in a multi-electron atom is easiest to remove?

Accepted Answer

The electron farthest from the nucleus

Question 7

A 1.20 g sample of compound contains 0.40 g H, 0.80 g O. What is the empirical formula?

Accepted Answer

$\mathrm{H}_2\mathrm{O}$

Question 8

Based on the Lewis diagram for $\mathrm{NH}_3$, what is the electron geometry?

Accepted Answer

Tetrahedral

Question 9

When Reaction 2 occurs, does the hybridization of the carbon atom change?

Accepted Answer

Yes, it changes from $sp$ to $sp$

Question 10

Which diatomic species contains 1 sigma and 2 pi bonds?

Accepted Answer

$\mathrm{N}_2$

Question 11

The potential energy diagram for three diatomic molecules X, Y, Z shows that X has the deepest well and shortest bond length. Which molecule is most likely $\mathrm{N}_2$?

Accepted Answer

X

Question 12

Which of the following diagrams best depicts an alloy of Ni and Hf?

Accepted Answer

A mixture of very different sized circles

Question 13

A 2.1 L container is filled with gas at 1.0 atm and 273 K. How many moles of gas are present?

Accepted Answer

$0.089 \mathrm{mol}$

Question 14

Which graph best represents the distribution of molecular speeds for a gas at a lower temperature?

Accepted Answer

A graph with a peak at lower speed

Question 15

A solution is prepared by mixing 0.10 mol MgCl2 in 0.50 L water. What is the concentration of chloride ions?

Accepted Answer

$0.20 \mathrm{M}$

Question 16

An experiment measures the absorbance of solutions of $\mathrm{Ni}^{2+}$ at different concentrations. The slope of the absorbance vs. concentration graph is 0.45. What is the absorbance of a 0.10 M solution?

Accepted Answer

0.45

Question 17

A student measures the absorbance of a solution twice and gets different results. What is the most likely explanation?

Accepted Answer

The solution was not mixed well between measurements

Question 18

What is the frequency of light with a wavelength of $3.3 	imes 10^{-7} \mathrm{m}$?

Accepted Answer

$4.98 	imes 10^{14} \mathrm{s}^{-1}$

Question 19

A 4.0 mol sample of H2S and 3.0 mol sample of SO2 are mixed. What is the limiting reactant in the reaction $2\mathrm{H}_2\mathrm{S} + \mathrm{SO}_2 \rightarrow 2\mathrm{H}_2\mathrm{O} + 3\mathrm{S}$?

Accepted Answer

SO2

General Chemistry: Comprehensive Study Notes (Matter, Atoms, Bonding, Gases, Thermochemistry, and More)

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