$M = \frac{\text{moles of solute}}{\text{volume of solution in liters}}$

Question 1

Which of the following elements has the greatest number of valence electrons in its ground state?

Accepted Answer

Phosphorus ($Z=15$)

Question 2

What is the correct Lewis structure for the nitrate ion ($NO_3^-$)?

Accepted Answer

One double bond and two single bonds between N and O, with resonance among the oxygens.

Question 3

Which molecule has a trigonal planar molecular geometry according to VSEPR theory?

Accepted Answer

Boron trifluoride ($BF_3$)

Question 4

A student mixes solutions of $AgNO_3$ and $NaCl$. What type of reaction occurs and what is the precipitate formed?

Accepted Answer

Precipitation reaction; $AgCl$ precipitate

Question 5

Which of the following is the correct formula to calculate the molarity ($M$) of a solution?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{volume of solution in liters}}$

Question 6

Which of the following best describes the difference between ionic and covalent molecules?

Accepted Answer

Ionic molecules transfer electrons; covalent molecules share electrons.

Question 7

What is the oxidation state of sulfur in $H_2SO_4$?

Accepted Answer

+6

Question 8

Calculate the number of moles in 18 grams of water ($H_2O$). ($M_{H_2O} = 18 	ext{ g/mol}$)

Accepted Answer

$1$ mole

Question 9

Which of the following acids is correctly named?

Accepted Answer

$HCl$ - Hydrochloric acid

Question 10

A solution contains $0.5$ moles of $NaCl$ dissolved in $250$ mL of water. What is the molarity of the solution?

Accepted Answer

$2.0$ M

Question 11

Which of the following best explains why $CO_2$ is a nonpolar molecule despite having polar bonds?

Accepted Answer

The linear geometry causes the bond dipoles to cancel each other.

Question 12

What is the electron geometry of $NH_3$ according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 13

Which of the following is a correct balanced equation for the precipitation reaction between $Pb(NO_3)_2$ and $KI$?

Accepted Answer

$Pb(NO_3)_2 + 2KI \rightarrow PbI_2 + 2KNO_3$

Question 14

Which subatomic particle is responsible for chemical bonding?

Accepted Answer

Electron

Question 15

A sample contains $3.01 	imes 10^{23}$ molecules of $O_2$. How many moles of $O_2$ are present?

Accepted Answer

$0.5$ moles

Question 16

Which of the following molecules has a bent molecular geometry?

Accepted Answer

$H_2O$

Question 17

What is the empirical formula for a compound containing $40.0\%$ carbon, $6.7\%$ hydrogen, and $53.3\%$ oxygen by mass?

Accepted Answer

$CH_2O$

Question 18

Which of the following is a correct net ionic equation for the reaction between $Na_2SO_4$ and $BaCl_2$?

Accepted Answer

$Ba^{2+} (aq) + SO_4^{2-} (aq) \rightarrow BaSO_4 (s)$

Question 19

A student needs to prepare $500$ mL of $0.2$ M $NaOH$ solution. How many grams of $NaOH$ are required? ($M_{NaOH} = 40 	ext{ g/mol}$)

Accepted Answer

$4$ g

Question 20

Which of the following statements about acids is correct?

Accepted Answer

Acids donate $H^+$ ions in solution.

General Chemistry I: Exam V Study Guide – Lewis Structures, VSEPR, and Foundational Concepts

Study Guide - Practice Questions