Q: A body-centered cubic unit cell of manganese has a density of $4.43\ \text{g/cm}^3$. If the edge length is $a = 2.89\ \text{\AA}$, what is the mass of one unit cell?

$1.08 \times 10^{-22}\ \text{g}$

Question 1

Which of the following statements about ionic and covalent bonds is CORRECT?

Accepted Answer

Ionic bonds result from the electrostatic attraction between oppositely charged ions.

Question 2

A sample of NaCl (sodium chloride) is dissolved in water. Which of the following best describes the process?

Accepted Answer

NaCl dissociates into Na$^+$ and Cl$^-$ ions due to hydration by water molecules.

Question 3

Which of the following molecules has a linear geometry according to VSEPR theory?

Accepted Answer

CO$_2$

Question 4

Given the following reaction: $2 	ext{Na} + 2 	ext{H}_2	ext{O} ightarrow 2 	ext{NaOH} + 	ext{H}_2$, what is the oxidation state of sodium before and after the reaction?

Accepted Answer

0 before, +1 after

Question 5

Which of the following compounds has the highest boiling point?

Accepted Answer

H$_2$O

Question 6

A solution is prepared by dissolving 0.5 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$0.5\ 	ext{M}$

Question 7

Which of the following is TRUE regarding the molecular orbital theory for O$_2$?

Accepted Answer

O$_2$ is paramagnetic due to the presence of unpaired electrons in its molecular orbitals.

Question 8

Which of the following statements about intermolecular forces is CORRECT?

Accepted Answer

Hydrogen bonding occurs only in molecules containing O-H, N-H, or F-H bonds.

Question 9

Calculate the mass of 0.25 mol of CaCO$_3$ (molar mass = 100 g/mol).

Accepted Answer

$25\ 	ext{g}$

Question 10

Which of the following molecules has the longest carbon-nitrogen covalent bond?

Accepted Answer

CH$_3$CN

Question 11

A body-centered cubic unit cell of manganese has a density of $4.43\ 	ext{g/cm}^3$. If the edge length is $a = 2.89\ 	ext{\AA}$, what is the mass of one unit cell?

Accepted Answer

$1.08 	imes 10^{-22}\ 	ext{g}$

Question 12

Which of the following is the correct formula for a unit cell with Cu at all the corner positions, Cl at the body position, and O at all the face positions?

Accepted Answer

Cu$_4$ClO$_6$

Question 13

Which of the following statements about hybridization is TRUE?

Accepted Answer

The oxygen atom in water (H$_2$O) is sp$^3$ hybridized.

Question 14

Which of the following molecules is expected to have the highest dipole moment?

Accepted Answer

H$_2$O

Question 15

Which of the following is NOT a property of metals?

Accepted Answer

Brittleness

Question 16

Which of the following best explains why ice floats on water?

Accepted Answer

Ice has a lower density than liquid water because its molecules are arranged in a more open structure.

Question 17

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

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

Question 18

Which of the following molecules contains a triple bond?

Accepted Answer

C$_2$H$_2$

Question 19

Which of the following is the correct order of increasing bond strength?

Accepted Answer

Single < Double < Triple

General Chemistry Practice Exam 1: Key Concepts and Study Guide

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