Question 1

Which of the following best describes the process of converting calcium oxide ($$\mathrm{CaO}) to $$calcium hydroxide ($$\mathrm{Ca(OH)_2}) in an $$industrial setting?

Accepted Answer

By dissolving $$\mathrm{CaO} in $$water.

Question 2

A student is asked to find the mass of sodium chloride ($$\mathrm{NaCl}) $$needed to prepare $$500\ \mathrm{mL} of a$$ $$1.0\ \mathrm{mol/L}$$ solution. What mass of $$\mathrm{NaCl}$$ should the student use? ($$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

Question 3

Which of the following equations correctly represents the reaction of calcium oxide ($$\mathrm{CaO}) $$with water?

Accepted Answer

$$\mathrm{CaO} + \mathrm{H_2O} \rightarrow \mathrm{Ca(OH)_2}$$

Question 4

If $$2.00\ \mathrm{mol} of $$sodium chloride ($$\mathrm{NaCl}) is $$dissolved in $$1.00\ \mathrm{L} of $$water, what is the molarity of the solution?

Accepted Answer

$$2.00\ \mathrm{mol/L}$$

Question 5

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) is $$used to melt ice on roads in winter?

Accepted Answer

It decreases the freezing point of water.

Question 6

A chemist needs to prepare $$250\ \mathrm{mL} of a$$ $$0.5\ \mathrm{mol/L}$$ solution of sodium chloride ($$\mathrm{NaCl}). $$What mass of $$\mathrm{NaCl} is $$required? ($$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

$$2.925\ \mathrm{g}$$

Question 7

Which of the following statements about the reaction $$\mathrm{CaO} + \mathrm{H_2O} \rightarrow \mathrm{Ca(OH)_2} is $$correct?

Accepted Answer

It is an example of a combination (synthesis) reaction.

Question 8

A $$0.1\ \mathrm{mol/L}$$ solution of sodium chloride ($$\mathrm{NaCl}) is $$prepared by dissolving $$0.5845\ \mathrm{g} of$$ $$\mathrm{NaCl} in $$water. What is the volume of the solution? ($$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

Question 9

Which of the following is the correct molar mass of sodium chloride ($$\mathrm{NaCl}$$)? ($$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

$$58.5\ \mathrm{g/mol}$$

Question 10

A laboratory technician needs to neutralize a spill of hydrochloric acid ($$\mathrm{HCl}) $$using calcium oxide ($$\mathrm{CaO}). $$Which balanced equation represents this neutralization reaction?

Accepted Answer

$$\mathrm{CaO} + 2\mathrm{HCl} \rightarrow \mathrm{$$CaCl_2$$} + \mathrm{H_2O}$$

Question 11

Which of the following best describes the role of sodium chloride ($$\mathrm{NaCl}) in $$the human body?

Accepted Answer

It is essential for nerve impulse transmission and fluid balance.

Question 12

A student mixes $$10.0\ \mathrm{g} of$$ $$\mathrm{NaCl}$$ with $$100.0\ \mathrm{g} of $$water. What is the mass percent of $$\mathrm{NaCl} in $$the solution?

Accepted Answer

$$9.09\%$$

Question 13

Which of the following is a correct statement about the solubility of sodium chloride ($$\mathrm{NaCl}) in $$water?

Accepted Answer

It is highly soluble in water due to the ionic nature of $$\mathrm{NaCl}.$$

Question 14

A solution is prepared by dissolving $$5.85\ \mathrm{g} of$$ $$\mathrm{NaCl} in $$enough water to make $$500\ \mathrm{mL} of $$solution. What is the molarity of the solution? ($$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

Question 15

Which of the following best describes the type of bond present in sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

Ionic bond

Question 16

A sample of $$2.00\ \mathrm{mol} of$$ $$\mathrm{CaO}$$ reacts completely with water. How many moles of $$\mathrm{Ca(OH)_2}$$ are produced?

Accepted Answer

$$2.00\ \mathrm{mol}$$

Question 17

Which of the following is a real-world application of calcium oxide ($$\mathrm{CaO}$$)?

Accepted Answer

Used in the manufacture of cement and mortar.

Question 18

A solution contains $$0.5\ \mathrm{mol} of$$ $$\mathrm{NaCl} in$$ $$250\ \mathrm{mL} of $$water. What is the molarity of the solution?

Accepted Answer

$$2.0\ \mathrm{mol/L}$$

Question 19

Which of the following best explains why $$\mathrm{CaO} is $$called 'quicklime'?

Accepted Answer

Because it reacts rapidly with water to form slaked lime.

Question 20

A $$1.0\ \mathrm{mol/L}$$ solution of $$\mathrm{NaCl} is $$prepared. How many grams of $$\mathrm{NaCl}$$ are present in $$250\ \mathrm{mL} of $$this solution? ($$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

$$14.625\ \mathrm{g}$$

Quantities in Chemical Reactions: Moles, Molar Mass, and Stoichiometry

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