Question 1

Which of the following is the correct electron configuration for a neutral sodium atom ($Z=11$)?

Accepted Answer

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

Question 2

A sample of gas occupies $500\ \mathrm{mL}$ at $27^\circ\mathrm{C}$ and $1\ \mathrm{atm}$. What volume will it occupy at $-23^\circ\mathrm{C}$ and $2\ \mathrm{atm}$? (Assume ideal gas behavior.)

Accepted Answer

$201\ \mathrm{mL}$

Question 3

Which intermolecular force is primarily responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 4

What is the oxidation state of chromium in $\mathrm{K_2Cr_2O_7}$?

Accepted Answer

$+6$

Question 5

Which of the following compounds has the highest mass percentage of oxygen?

Accepted Answer

$\mathrm{H_2O_2}$

Question 6

How many grams of $\mathrm{NaOH}$ (MW = $40.0\ \mathrm{g/mol}$) are needed to prepare $250\ \mathrm{mL}$ of a $0.400\ \mathrm{M}$ solution?

Accepted Answer

$4.00\ \mathrm{g}$

Question 7

Which of the following species has the smallest ionic radius?

Accepted Answer

$\mathrm{Al^{3+}}$

Question 8

For the reaction $2\mathrm{NO}(g) \rightarrow \mathrm{N_2}(g) + \mathrm{O_2}(g)$, given $\Delta H_f^\circ(\mathrm{NO}) = 90.25\ \mathrm{kJ/mol}$, $\Delta H_f^\circ(\mathrm{N_2}) = 0.0\ \mathrm{kJ/mol}$, $\Delta H_f^\circ(\mathrm{O_2}) = 0.0\ \mathrm{kJ/mol}$, what is the enthalpy of reaction?

Accepted Answer

$-180.5\ \mathrm{kJ}$

Question 9

Which of the following best describes what happens when an electron transitions from the ground state to an excited state?

Accepted Answer

A photon is absorbed

Question 10

What is the molecular geometry of $\mathrm{NO_3^-}$?

Accepted Answer

Trigonal planar

Question 11

A $100.0\ \mathrm{mL}$ sample of gas at STP is heated to $200^\circ\mathrm{C}$ and $3.0\ \mathrm{atm}$. What is the final volume? (Assume ideal gas behavior.)

Accepted Answer

$114.4\ \mathrm{mL}$

Question 12

Which of the following is a strong electrolyte?

Accepted Answer

$\mathrm{NaCl}$

Question 13

Which type of chemical reaction is represented by $2\mathrm{H_2O}_2 \rightarrow 2\mathrm{H_2O} + \mathrm{O_2}$?

Accepted Answer

Decomposition

Question 14

Which of the following statements about exothermic reactions is correct?

Accepted Answer

Exothermic reactions release energy to the surroundings

Question 15

Calculate the wavelength of light emitted when an electron in a hydrogen atom drops from $n=4$ to $n=2$. (Use $R_H = 1.097 	imes 10^7\ \mathrm{m}^{-1}$)

Accepted Answer

$486.1\ \mathrm{nm}$

Question 16

Which of the following best explains why noble gases are very unreactive?

Accepted Answer

They have completely filled valence shells

Question 17

What is the formal charge of the sulfur atom in $\mathrm{SO_4^{2-}}$?

Accepted Answer

0

Question 18

Which of the following is the correct set of quantum numbers for an electron in the $3p$ subshell?

Accepted Answer

$n=3,\ l=1,\ m_l=0,\ m_s=+\frac{1}{2}$

Question 19

Which of the following best describes the red region in the electrostatic potential map of $\mathrm{BF_3}$?

Accepted Answer

Region near the fluorine atoms (most negative potential)

Question 20

Which of the following is most compressible?

Accepted Answer

Helium gas

General Chemistry Study Guide: Atomic Structure, Chemical Reactions, and Properties of Matter

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