Q: Calculate the frequency of visible light having a wavelength of $486\ \mathrm{nm}$ (speed of light $c = 3.0 \times 10^8\ \mathrm{m/s}$).

$6.17 \times 10^{14}\ \mathrm{Hz}$

Q: Which of the following best explains why the second ionization energy of sodium is much greater than the first?

The second electron is removed from a stable, noble gas configuration.

Question 1

Which of the following is a chemical property of tin (Sn)?

Accepted Answer

Tin dissolves slowly in cold, dilute hydrochloric acid, but it dissolves readily in concentrated hydrochloric acid.

Question 2

How many micrometers are in 6.0 kilometers?

Accepted Answer

$6.0 	imes 10^9$ micrometers

Question 3

Dry ice (solid CO$_2$) sublimes at $-78.5\ ^\circ \mathrm{C}$. What is this temperature in Kelvin?

Accepted Answer

$194.65\ \mathrm{K}$

Question 4

A piece of metal with a mass of 114 g was placed into a graduated cylinder that contained 25.00 mL of water, raising the water level to 42.50 mL. What is the density of the metal?

Accepted Answer

$6.51\ \mathrm{g/cm^3}$

Question 5

Radio waves travel at the speed of light, which is $3.0 	imes 10^8\ \mathrm{m/s}$. How many minutes does it take for a radio message to reach Earth from Mars if Mars is $9.9 	imes 10^7\ \mathrm{km}$ from Earth?

Accepted Answer

$5.5$ minutes

Question 6

Which is the correct formula for copper (II) phosphate?

Accepted Answer

$\mathrm{Cu_3(PO_4)_2}$

Question 7

The chemical name for ClO$_2^-$ is chlorite ion. Therefore, the name of HClO$_2$ is:

Accepted Answer

Chlorous acid

Question 8

Which of the following is the formula for hydrobromic acid?

Accepted Answer

$\mathrm{HBr}$

Question 9

Calculate the frequency of visible light having a wavelength of $486\ \mathrm{nm}$ (speed of light $c = 3.0 	imes 10^8\ \mathrm{m/s}$).

Accepted Answer

$6.17 	imes 10^{14}\ \mathrm{Hz}$

Question 10

The number of orbitals in a d subshell is:

Accepted Answer

5

Question 11

Which element has the following ground-state electron configuration: $[\mathrm{Kr}]4d^{10}5s^25p^4$?

Accepted Answer

Te

Question 12

How many electrons are there in the 2nd principal energy level ($n=2$) of a phosphorus atom?

Accepted Answer

8

Question 13

Which of the following is most likely to be a covalent compound?

Accepted Answer

$\mathrm{NH_3}$

Question 14

A compound contains 48.65% carbon, 8.108% hydrogen, and the remainder oxygen. The molecular mass of this compound is approximately 74.00 g/mol. What is the empirical formula?

Accepted Answer

$\mathrm{C_3H_6O_2}$

Question 15

Arrange the following in order of increasing first ionization energy: Na, Cl, Al, S, Cs.

Accepted Answer

Cs < Na < Al < S < Cl

Question 16

Which of the following best explains why the second ionization energy of sodium is much greater than the first?

Accepted Answer

The second electron is removed from a stable, noble gas configuration.

Question 17

Which of the following pairs of elements would you expect to have the most similar chemical properties?

Accepted Answer

Na and K

Question 18

What is the ground-state electron configuration for chlorine?

Accepted Answer

$1s^22s^22p^63s^23p^5$

Question 19

Which of the following ions has the largest ionic radius?

Accepted Answer

$\mathrm{O^{2-}}$

Question 20

A radioisotope of gallium, $^{71}\mathrm{Ga}$, has a natural abundance of 37.0%. $^{69}\mathrm{Ga}$ has an abundance of 62.1%. Calculate the average atomic mass of gallium.

Accepted Answer

$69.72\ \mathrm{amu}$

General Chemistry: Atomic Structure, Periodicity, Compounds, and Calculations – Study Guide

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