Q: A sample contains 18.0 g of water (H$$_2O). $$How many molecules of water are present in the sample? (Molar mass of H$$_2O = 18.0 g/$$mol, Avogadro's number = $$6.022 \times 10$$^{23}$$)

$$6.02 \times 10$$^{23}$$ molecules

Question 1

Which of the following compounds is an ionic compound?

Accepted Answer

NaCl

Question 2

What is the correct chemical formula for aluminum sulfate?

Accepted Answer

Al$$_2(SO$_4$$)$$_3$$

Question 3

Calculate the molar mass of calcium nitrate, Ca(NO$$_3$$)$$_2.$$

Accepted Answer

$$164.10\ \mathrm{g/mol}$$

Question 4

A sample contains 18.0 g of water (H$$_2O). $$How many molecules of water are present in the sample? (Molar mass of H$$_2O = 18.0 g/$$mol, Avogadro's number = $$6.022 	imes 10$$^{23}$$)

Accepted Answer

$$6.02 	imes 10$$^{23}$$ molecules

Question 5

Which of the following is the correct name for H$$_2SO$_4$$?

Accepted Answer

Sulfuric acid

Question 6

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

Accepted Answer

CH$$_2O$$

Question 7

Which of the following is evidence that a chemical reaction has occurred?

Accepted Answer

A color change occurs when two solutions are mixed

Question 8

Which of the following is a balanced net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$\mathrm{Ba}^{2+}(aq) + \mathrm{SO}_4$$^{2-}$$(aq) \rightarrow \mathrm{BaSO}_4(s)$$

Question 9

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

AgCl

Question 10

What is the oxidation state of sulfur in H$$_2SO$_4$$?

Accepted Answer

+6

Question 11

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{Zn}(s) + \mathrm{CuSO}_4(aq) \rightarrow \mathrm{ZnSO}_4(aq) + \mathrm{Cu}(s)$$

Question 12

Which of the following is the correct balanced equation for the combustion of methane (CH$$_4) in $$oxygen?

Accepted Answer

$$\mathrm{CH}_4 + 2\mathrm{O}_2 \rightarrow \mathrm{CO}_2 + 2\mathrm{H}_2\mathrm{O}$$

Question 13

A solution is prepared by dissolving 5.85 g of NaCl in enough water to make 500.0 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.5 g/mol)

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 14

Which of the following is the correct molecular formula for a compound with empirical formula CH$$_2O $$and molar mass 180 g/mol?

Accepted Answer

C$$_6H$_{12}O$_6$$

Question 15

Which of the following is a double-displacement reaction?

Accepted Answer

$$\mathrm{AgNO}_3(aq) + \mathrm{NaCl}(aq) \rightarrow \mathrm{AgCl}(s) + \mathrm{NaNO}_3(aq)$$

Question 16

Which of the following is a spectator ion in the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

Na$$^+$$

Question 17

Which of the following is the correct balanced equation for the reaction of hydrochloric acid with sodium hydroxide?

Accepted Answer

$$\mathrm{HCl}(aq) + \mathrm{NaOH}(aq) \rightarrow \mathrm{NaCl}(aq) + \mathrm{H}_2\mathrm{O}(l)$$

Question 18

A student mixes solutions of lead(II) nitrate and potassium iodide. A yellow precipitate forms. What is the balanced molecular equation for this reaction?

Accepted Answer

$$\mathrm{Pb(NO}_3)_2(aq) + 2\mathrm{KI}(aq) \rightarrow \mathrm{PbI}_2(s) + 2\mathrm{KNO}_3(aq)$$

Question 19

Which of the following best describes the role of the oxidizing agent in a redox reaction?

Accepted Answer

It gains electrons and is reduced

General Chemistry Study Guide: Chemical Formulas, Compounds, and Chemical Reactions (Chapters 5–7)

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