Question 1

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 2

A student needs to prepare 250.0 mL of a 0.100 M $$\mathrm{Na_2SO_4}$$ solution. How many grams of $$\mathrm{Na_2SO_4} ($$molar mass = 142.04 g/mol) are required?

Accepted Answer

$$3.55 g$$

Question 3

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 4

Which of the following is NOT a diatomic element in its natural state?

Accepted Answer

Sulfur

Question 5

What is the empirical formula for a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 6

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids completely dissociate in water.

Question 7

A solution is prepared by dissolving 0.50 mol of $$\mathrm{KCl} in $$enough water to make 1.0 L of solution. What is the concentration of chloride ions in the solution?

Accepted Answer

$$0.50 M$$

Question 8

Which of the following best describes the process when $$\mathrm{NH_3$} is $$dissolved in water?

Accepted Answer

Partial ionization forming $$\mathrm{NH_4$^+}$$ and $$\mathrm{OH^-}$$

Question 9

Which of the following compounds is insoluble in water according to solubility rules?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 10

A reaction has a theoretical yield of 10.0 g, but only 7.5 g of product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 11

Which of the following is the correct name for $$\mathrm{Fe_2$(SO_4$)_3}$$?

Accepted Answer

Iron(III) sulfate

Question 12

How many significant figures are in the measurement 0.0045600 g?

Accepted Answer

6

Question 13

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

Accepted Answer

$$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$$

Question 14

What is the molarity of a solution prepared by diluting 50.0 mL of 6.00 M $$\mathrm{$$HNO_3$$} to a $$final volume of 300.0 mL?

Accepted Answer

$$1.00 M$$

Question 15

Which of the following is a binary molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

A solution contains $$0.20$$ mol of $$\mathrm{$$CaCl_2$$} in$$ $$500 mL of $$solution. What is the total concentration of ions in the solution?

Accepted Answer

$$1.2 M$$

Question 17

Which of the following is the correct complete ionic equation for the reaction of $$\mathrm{Ba(NO_3$)_2}$$ and $$\mathrm{Na_2SO_4} in $$aqueous solution?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + 2NO_3^- (aq) + 2Na^+ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s) + 2Na^+ (aq) + 2NO_3^- (aq)}$$

Question 18

Which of the following is a strong base?

Accepted Answer

$$\mathrm{KOH}$$

Question 19

Which of the following is the correct formula for dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 20

A sample contains 0.250 mol of $$\mathrm{Mg(OH)_2}. $$How many grams does this sample contain? (Molar mass = 58.31 g/mol)

Accepted Answer

$$14.6 g$$

CHEM105 Exam 3 Study Guide: Matter, Compounds, Solutions, Stoichiometry, and Acid-Base Reactions

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