Question 1

Which of the following correctly represents the Lewis structure for carbon dioxide ($$\mathrm{CO_2$}$$)?

Accepted Answer

O=C=O, with each oxygen atom having two lone pairs

Question 2

According to VSEPR theory, what is the molecular geometry of ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Trigonal pyramidal

Question 3

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in the molecule ethyne ($$\mathrm{C_2H_2}$$)?

Accepted Answer

$$3$$ sigma and $$2 pi $$bonds

Question 4

Which hybridization is present in the central atom of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$sp^3$$

Question 5

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

Accepted Answer

Sodium donates one electron to chlorine, forming $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions

Question 6

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following is the correct formula for sulfuric acid?

Accepted Answer

$$\mathrm{H_2SO_4}$$

Question 8

A solution is prepared by dissolving $$10.0\ \mathrm{g} of$$ $$\mathrm{NaCl} in $$enough water to make $$500.0\ \mathrm{mL} of $$solution. What is the molarity ($$M) of $$the solution? ($$\mathrm{NaCl}$$ molar mass = $$58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.342\ M$$

Question 9

If $$25.0\ \mathrm{mL} of a$$ $$2.00\ M$$ solution is diluted to a final volume of $$100.0\ \mathrm{mL}$$, what is the new concentration?

Accepted Answer

$$0.500\ M$$

Question 10

How many moles of solute are present in $$250.0\ \mathrm{mL} of a$$ $$0.200\ M$$ solution?

Accepted Answer

$$0.0500$$ moles

Question 11

A compound contains $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 12

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

Accepted Answer

Ionic compounds involve electron transfer, while covalent compounds involve electron sharing

Question 13

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

Accepted Answer

$$\mathrm{H_2O}$$

Question 14

What is the hybridization of the central atom in $$\mathrm{BF_3$}$$?

Accepted Answer

$$sp^2$$

Question 15

Which of the following is the correct name for $$\mathrm{Ca(OH)_2}$$?

Accepted Answer

Calcium hydroxide

Question 16

A $$0.250\ M$$ solution of $$\mathrm{HCl}$$ has a volume of $$2.00\ L. $$How many grams of $$\mathrm{HCl}$$ are present? ($$\mathrm{HCl}$$ molar mass = $$36.46\ \mathrm{g/mol})$$

Accepted Answer

$$18.2\ \mathrm{g}$$

Question 17

Which of the following is the correct formula for aluminum sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 18

Which of the following statements about acids is correct?

Accepted Answer

Acids produce $$\mathrm{H^+}$$ ions in aqueous solution

Question 19

Which of the following best describes the electron movement in the formation of magnesium oxide ($$\mathrm{MgO}$$)?

Accepted Answer

Magnesium transfers two electrons to oxygen, forming $$\mathrm{Mg$$^{2+}$$}$$ and $$\mathrm{O$$^{2-}$$}$$

Question 20

A $$1.00\ M$$ solution of $$\mathrm{NaOH} is $$diluted to $$0.250\ M. If $$the final volume is $$800.0\ \mathrm{mL}$$, what was the initial volume of the $$1.00\ M$$ solution used?

Accepted Answer

$$200.0\ \mathrm{mL}$$

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

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