$$2 \text{ mol H} : 1 \text{ mol H}_2\text{O}$$

Question 1

Which of the following best explains why water (H$$_2O) $$has properties dramatically different from those of hydrogen and oxygen gases?

Accepted Answer

Water is a compound formed by a fixed ratio of hydrogen and oxygen atoms, resulting in new properties.

Question 2

Which of the following substances is classified as a molecular element?

Accepted Answer

O$$_2$$

Question 3

What type of bond forms between sodium and chlorine in table salt (NaCl)?

Accepted Answer

Ionic bond

Question 4

Which of the following is the correct empirical formula for a compound with the molecular formula C$$_4H$_8$$?

Accepted Answer

CH$$_2$$

Question 5

A sample of a compound contains 24.5 g nitrogen and 70.0 g oxygen. What is the empirical formula of the compound? (N: 14.01 g/mol, O: 16.00 g/mol)

Accepted Answer

N$$_2O$_5$$

Question 6

Which of the following best describes a polyatomic ion?

Accepted Answer

A group of covalently bonded atoms with an overall charge

Question 7

What is the correct name for the compound FeCl$$_3$$?

Accepted Answer

Iron(III) chloride

Question 8

Which of the following is a correct formula for a compound formed between aluminum and oxygen?

Accepted Answer

Al$$_2O$_3$$

Question 9

Which of the following is the correct name for the compound N$$_2O$_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 10

A 10.0 g sample of CCl$$_2F$_2$$ contains how many grams of chlorine? (C: 12.01 g/mol, Cl: 35.45 g/mol, F: 19.00 g/mol)

Accepted Answer

5.86 g

Question 11

Which of the following best describes the difference between ionic and molecular compounds?

Accepted Answer

Molecular compounds contain molecules as their smallest unit, while ionic compounds are composed of a lattice of ions.

Question 12

Which of the following is the correct name for HNO$$_2(aq$$)?

Accepted Answer

Nitrous acid

Question 13

A compound has the empirical formula CH$$_2O $$and a molar mass of 180 g/mol. What is its molecular formula?

Accepted Answer

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

Question 14

Which of the following is a functionalized hydrocarbon?

Accepted Answer

CH$$_3OH$$

Question 15

Which of the following is the correct formula for potassium sulfate?

Accepted Answer

K$$_2SO$_4$$

Question 16

A 0.500 g sample of a compound contains 0.200 g of sodium. What is the mass percent of sodium in the compound?

Accepted Answer

40%

Question 17

Which of the following is the correct name for the compound with the formula P$$_4S$_{10}$$?

Accepted Answer

Tetraphosphorus decasulfide

Question 18

Which of the following is a correct ratio that can be derived from the chemical formula H$$_2O$$?

Accepted Answer

$$2 	ext{ mol H} : 1 	ext{ mol H}_2	ext{O}$$

Question 19

Which of the following best describes an alkene?

Accepted Answer

A hydrocarbon with at least one double bond

Question 20

A compound is found to be 52.14% C, 13.13% H, and 34.73% O by mass. What is its empirical formula?

Accepted Answer

C$$_2H$_6O$$

Molecules and Compounds: Structure, Types, and Nomenclature

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