Q: How many molecules are in 36.04 g of water ($$H_2O$$)? (Molar mass of $$H_2O = 18.02 g/$$mol, Avogadro's number = $$6.022 \times 10$$^{23}$$ molecules/mol)

$$1.204 \times 10$$^{24}$$ molecules

Question 1

Which of the following best describes the difference between a mixture and a compound, as illustrated by hydrogen and oxygen gases versus water?

Accepted Answer

A compound has a fixed ratio of elements, while a mixture can have any ratio.

Question 2

Which statement correctly describes an ionic bond?

Accepted Answer

It is the attraction between a cation and an anion.

Question 3

What is the empirical formula for glucose ($$C_6H_{12}O_6$)?

Accepted Answer

$$CH_2O$$

Question 4

Which of the following compounds is most likely to be ionic?

Accepted Answer

NaCl

Question 5

A sample contains 40.0 g of carbon and 6.7 g of hydrogen. What is the empirical formula of the compound? (Atomic masses: C = 12.0 g/mol, H = 1.0 g/mol)

Accepted Answer

$$CH_2$$

Question 6

Which of the following is the correct name for $$Fe^{3+}$$?

Accepted Answer

Ferric ion

Question 7

What is the formula mass of water ($$H_2O$$)? (Atomic masses: H = 1.01 amu, O = 16.00 amu)

Accepted Answer

$$18.02$$ amu

Question 8

Which of the following is the correct molecular formula for butene?

Accepted Answer

$$C_4H_8$$

Question 9

Which of the following is a correct rule for naming binary molecular compounds?

Accepted Answer

Prefixes are used to indicate the number of atoms of each element.

Question 10

What is the correct name for $$NO_2$$?

Accepted Answer

Nitrogen dioxide

Question 11

Which of the following is a polyatomic cation?

Accepted Answer

NH$$_4^+$$

Question 12

A compound contains 53.5% C, 15.5% H, and 31.0% N by mass. What is its empirical formula? (Atomic masses: C = 12.0 g/mol, H = 1.0 g/mol, N = 14.0 g/mol)

Accepted Answer

Question 13

Which of the following is the correct name for $$H_2SO_4$$?

Accepted Answer

Sulfuric acid

Question 14

Which of the following is the correct formula for barium hydroxide?

Accepted Answer

$$Ba(OH)_2$$

Question 15

How many molecules are in 36.04 g of water ($$H_2O$$)? (Molar mass of $$H_2O = 18.02 g/$$mol, Avogadro's number = $$6.022 	imes 10$$^{23}$$ molecules/mol)

Accepted Answer

$$1.204 	imes 10$$^{24}$$ molecules

Question 16

Which of the following is the correct empirical formula for pentene ($$C_5H_{10}$$)?

Accepted Answer

$$CH_2$$

Question 17

Which of the following is a correct statement about the structure of ionic compounds in the solid state?

Accepted Answer

Ions of opposite charge are arranged in a 3D lattice.

Question 18

Which of the following is the correct name for $$NaCl$$?

Accepted Answer

Sodium chloride

Question 19

Which of the following is the correct formula for ammonium ion?

Accepted Answer

$$NH_4$$^+$$

Question 20

Which of the following is the correct name for $$HClO_3$$?

Accepted Answer

Chloric acid

Chapter 3: Molecules and Compounds – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard