Q: How many molecules are present in $$2.00$$ moles of carbon dioxide ($$\mathrm{CO_2$}$$)? (Avogadro's number $$= 6.022 \times 10$$^{23}$$ molecules/mol)

$$1.20 \times 10$$^{24}$$ molecules

Question 1

Which of the following best describes how an ionic bond forms between sodium (Na) and chlorine (Cl)?

Accepted Answer

Sodium donates an electron to chlorine, resulting in oppositely charged ions that attract each other.

Question 2

Given the following elements, which pair is most likely to form a covalent bond?

Accepted Answer

Carbon (C) and Oxygen (O)

Question 3

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

Accepted Answer

Iron(III) chloride

Question 4

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

Accepted Answer

$$\mathrm{H_2SO_4}$$

Question 5

A molecule of methane ($$\mathrm{CH_4$}) $$has which molecular shape according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 6

Which of the following statements about the Lewis structure of water ($$\mathrm{H_2O}) is $$correct?

Accepted Answer

The central atom is oxygen, which forms two single bonds and has two lone pairs.

Question 7

How many molecules are present in $$2.00$$ moles of carbon dioxide ($$\mathrm{CO_2$}$$)? (Avogadro's number $$= 6.022 	imes 10$$^{23}$$ molecules/mol)

Accepted Answer

$$1.20 	imes 10$$^{24}$$ molecules

Question 8

What is the mass of $$0.50$$ moles of sodium chloride ($$\mathrm{NaCl}$$)? (Molar mass of $$\mathrm{NaCl} = 58.44 g/$$mol)

Accepted Answer

$$29.22 g$$

Question 9

At standard temperature and pressure (STP), what is the volume occupied by $$3.00$$ moles of nitrogen gas ($$\mathrm{N_2$}$$)? (Molar volume at STP $$= 22.4 L/$$mol)

Accepted Answer

$$67.2 L$$

Question 10

What is the percent by mass of oxygen in water ($$\mathrm{H_2O}$$)? (Molar mass: H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

$$88.8\%$$

Question 11

A sample contains $$18.0 g of $$glucose ($$\mathrm{C_6H_{12}O_6$}$$, molar mass $$= 180 g/$$mol). How many moles of glucose are present?

Accepted Answer

$$0.10$$ mol

Question 12

Which of the following is a balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 13

Which type of reaction is represented by the following equation? $$\mathrm{2KClO_3 \rightarrow 2KCl + 3O_2}$$

Accepted Answer

Decomposition

Question 14

In the redox reaction $$\mathrm{Zn + Cu$$^{2+}$$ \rightarrow Zn$$^{2+}$$ + Cu}$$, which species is oxidized?

Accepted Answer

$$\mathrm{Zn}$$

Question 15

In the reaction $$\mathrm{2Na + Cl_2$ \rightarrow 2NaCl}$$, what is the mole ratio of sodium to sodium chloride?

Accepted Answer

1:1

Question 16

If $$10.0 g of $$hydrogen gas ($$\mathrm{H_2$}) $$reacts with $$80.0 g of $$oxygen gas ($$\mathrm{O_2$}) to $$form water, which is the limiting reactant? (Molar mass: $$\mathrm{H_2$} = 2.02 g/$$mol, $$\mathrm{O_2$} = 32.00 g/$$mol)

Accepted Answer

$$\mathrm{H_2$}$$

Question 17

A reaction has a theoretical yield of $$50.0 g$$, but only $$40.0 g of $$product is actually obtained. What is the percent yield?

Accepted Answer

$$80.0\%$$

Question 18

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

Accepted Answer

It gains electrons and is reduced.

Question 19

How many grams of oxygen are present in $$50.0 g of$$ $$\mathrm{$$CaCO_3$$}$$? (Molar mass: $$\mathrm{$$CaCO_3$$} = 100.1 g/$$mol; O = 16.00 g/mol)

Accepted Answer

$$24.0 g$$

Question 20

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Section 2 Study Guide: Molecular Structure, Bonding, Moles, Chemical Reactions, and Stoichiometry

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