Q: The atomic radius of a uranium atom is approximately $175\ \mathrm{pm}$. In correct scientific notation, this is:

$1.75 \times 10^{-10}\ \mathrm{m}$

Q: Which of the following statements about atomic orbitals is correct?

A $2p$ orbital has a node at the nucleus.

Q: Which of the following best explains why the first ionization energy increases across a period?

Increasing nuclear charge with little increase in shielding

Question 1

Which subatomic particles have approximately equal masses?

Accepted Answer

protons and neutrons

Question 2

A $^{16}_{8}\mathrm{O}$ ion has 8 protons, 8 neutrons, and how many electrons?

Accepted Answer

10

Question 3

What value should be reported as the volume of a strip of aluminum foil measuring $15.37\ \mathrm{cm} 	imes 4.25\ \mathrm{cm} 	imes 0.0010\ \mathrm{cm}$?

Accepted Answer

$0.065\ \mathrm{cm}^3$

Question 4

The atomic radius of a uranium atom is approximately $175\ \mathrm{pm}$. In correct scientific notation, this is:

Accepted Answer

$1.75 	imes 10^{-10}\ \mathrm{m}$

Question 5

When comparing the dark Fraunhofer lines with lines emitted by burning elements, Bunsen and Kirchhoff concluded that:

Accepted Answer

each element absorbs and emits the same wavelengths

Question 6

Which of the following orbitals is the second lowest in energy (assuming they are all in the same shell)?

Accepted Answer

$p$

Question 7

If the principal quantum number is $n = 7$ and the angular momentum quantum number is $l = 3$ ($f$ orbital), which of the following values is NOT an allowed value of the magnetic quantum number ($m_l$)?

Accepted Answer

4

Question 8

Which transition in a hydrogen atom absorbs a photon with the longest wavelength?

Accepted Answer

$n_i = 2$ to $n_f = 3$

Question 9

How many unpaired electrons does $\mathrm{Co}^{2+}$ have?

Accepted Answer

3

Question 10

What is the average molar mass (in g/mol) for the newly discovered element, Crionisotium, given the following data? 
Isotope: $^{301}\mathrm{Cr}$, Mass: $300.94$ g/mol, Abundance: $73.10\%$ 
Isotope: $^{303}\mathrm{Cr}$, Mass: $302.95$ g/mol, Abundance: $26.90\%$

Accepted Answer

$301.54$

Question 11

A $12.0$ g piece of dark chocolate is found to contain $1.50$ mg of caffeine. If the caffeine content in a $600$ mL mug of coffee is $451$ mg, how many kg of chocolate would you have to eat to consume the amount of caffeine in $2$ mugs of this particular coffee?

Accepted Answer

$7.22$ kg

Question 12

How many moles of $\mathrm{H}_2\mathrm{CO}_3$ are in $450.0$ g of $\mathrm{H}_2\mathrm{CO}_3$? (Molar mass $= 62.03$ g/mol)

Accepted Answer

$7.26$ mol

Question 13

How many moles of H atoms are in $450.0$ g of $\mathrm{H}_2\mathrm{CO}_3$?

Accepted Answer

$14.52$ mol$

Question 14

How many atoms of H are in $450.0$ g of $\mathrm{H}_2\mathrm{CO}_3$?

Accepted Answer

$8.74 	imes 10^{24}$

Question 15

Arrange P, S, and Na in order of increasing first ionization energy.

Accepted Answer

Na < P < S

Question 16

Arrange P, S, and Na in order of increasing atomic radius.

Accepted Answer

S < P < Na

Question 17

Which of the following statements about atomic orbitals is correct?

Accepted Answer

A $2p$ orbital has a node at the nucleus.

Question 18

Which of the following best explains why the first ionization energy increases across a period?

Accepted Answer

Increasing nuclear charge with little increase in shielding

Question 19

Which of the following is a correct electron configuration for $\mathrm{S}$ (sulfur)?

Accepted Answer

$1s^2\ 2s^2\ 2p^6\ 3s^2\ 3p^4$

General Chemistry Exam Study Guide: Atomic Structure, Chemical Quantities, and Periodic Trends

Study Guide - Practice Questions

Study Guide - Flashcards