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$$_2O$$

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$$_3CN$$

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$$_2O) is sp$^3$$ hybridized.

Question 14

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

Accepted Answer

H$$_2O$$

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$$_2H$_2$$

Question 19

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

Accepted Answer

Single \u003c Double \u003c Triple

General Chemistry Practice Exam 1: Key Concepts and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard