Question 1

Which of the following correctly describes the molecular geometry of $$	ext{CO}_2$$ according to VSEPR theory?

Accepted Answer

Linear, with two regions of electron density around the central atom

Question 2

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule $$	ext{C}_2	ext{H}_4 ($$ethene)?

Accepted Answer

5 $$\sigma$$ bonds and 1 $$\pi$$ bond

Question 3

Which of the following Lewis structures correctly represents the bonding in $$	ext{NH}_3$$?

Accepted Answer

Three single bonds to hydrogen and one lone pair on nitrogen

Question 4

What is the hybridization of the central atom in $$	ext{CH}_4$$?

Accepted Answer

$$sp^3$$

Question 5

Which of the following best describes the electron transfer in the formation of sodium chloride ($$	ext{NaCl}$$)?

Accepted Answer

Sodium donates an electron to chlorine, forming ions

Question 6

Which of the following is the correct formula for magnesium chloride?

Accepted Answer

$$	ext{MgCl}_2$$

Question 7

What is the molarity ($$M) of a $$solution prepared by dissolving 10.0 g of $$	ext{NaCl} ($$molar mass = 58.44 g/mol) in enough water to make 500 mL of solution?

Accepted Answer

$$0.34\ M$$

Question 8

A 1.0 M solution of $$	ext{HCl} is $$diluted to a final volume of 250 mL. If the initial volume was 50 mL, what is the final concentration?

Accepted Answer

$$0.20\ M$$

Question 9

Which of the following is the correct empirical formula for a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$	ext{CH}_2	ext{O}$$

Question 10

Which of the following is a correct name for the compound $$	ext{H}_2	ext{SO}_4$$?

Accepted Answer

Sulfuric acid

Question 11

What is the molecular geometry of $$	ext{BF}_3$$ according to VSEPR theory?

Accepted Answer

Trigonal planar

Question 12

Which of the following compounds is ionic?

Accepted Answer

$$	ext{Na}_2	ext{O}$$

Question 13

How many lone pairs are present on the central atom in the Lewis structure of $$	ext{H}_2	ext{O}$$?

Accepted Answer

Two

Question 14

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$	ext{Ca}_3(	ext{PO}_4)_2$$

Question 15

A student prepares 250 mL of a 0.5 M $$	ext{KNO}_3$$ solution. How many grams of $$	ext{KNO}_3 ($$molar mass = 101.1 g/mol) are required?

Accepted Answer

12.6 g

Question 16

Which of the following best describes the bonding in $$	ext{O}_2$$?

Accepted Answer

A double bond and two lone pairs on each oxygen

Question 17

What is the hybridization of the central atom in $$	ext{BeCl}_2$$?

Accepted Answer

$$sp$$

Question 18

Which of the following is the correct name for $$	ext{Na}_2	ext{SO}_4$$?

Accepted Answer

Sodium sulfate

Question 19

A solution is made by diluting 100 mL of 2.0 M $$	ext{HNO}_3 to a $$final volume of 500 mL. What is the final concentration?

Accepted Answer

$$0.40\ M$$

Question 20

Which of the following is the correct empirical formula for a compound with 27.3% carbon, 72.7% oxygen by mass?

Accepted Answer

$$	ext{CO}_2$$

General Chemistry Study Guide: Molecular Structure, Nomenclature, and Calculations

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