Q: A sample of ammonia ($\text{NH}_3$) is decomposed and found to contain 14.0 g of nitrogen and 3.0 g of hydrogen. What is the mass ratio of nitrogen to hydrogen in ammonia?

$\frac{14.0\ \text{g}\ N}{3.0\ \text{g}\ H} = 4.7:1$

Question 1

Which statement best describes the law of constant composition as it applies to water?

Accepted Answer

All samples of pure water have hydrogen and oxygen in a fixed mass ratio of $\frac{16.0\ 	ext{g}\ O}{2.0\ 	ext{g}\ H} = 8.0:1$.

Question 2

Which of the following is a correct chemical formula for a compound containing magnesium and nitrate ions?

Accepted Answer

$	ext{Mg(NO}_3)_2$

Question 3

A sample of ammonia ($	ext{NH}_3$) is decomposed and found to contain 14.0 g of nitrogen and 3.0 g of hydrogen. What is the mass ratio of nitrogen to hydrogen in ammonia?

Accepted Answer

$\frac{14.0\ 	ext{g}\ N}{3.0\ 	ext{g}\ H} = 4.7:1$

Question 4

Which of the following best distinguishes a compound from a mixture?

Accepted Answer

A compound contains elements in fixed, definite proportions, while a mixture contains elements in variable proportions.

Question 5

What is the empirical formula for hydrogen peroxide, given its molecular formula is $	ext{H}_2	ext{O}_2$?

Accepted Answer

$	ext{HO}$

Question 6

Which of the following elements exists naturally as a diatomic molecule?

Accepted Answer

Chlorine ($	ext{Cl}_2$)

Question 7

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

Accepted Answer

$	ext{Al}_2	ext{O}_3$

Question 8

What is the correct name for the compound $	ext{FeCl}_3$?

Accepted Answer

Iron(III) chloride

Question 9

Which of the following is the correct systematic name for $	ext{H}_2	ext{SO}_4$?

Accepted Answer

Sulfuric acid

Question 10

Which of the following compounds is classified as a molecular compound?

Accepted Answer

$	ext{CO}_2$

Question 11

What is the formula mass of sodium chloride ($	ext{NaCl}$), given the atomic masses: $	ext{Na} = 22.99\ 	ext{u}$, $	ext{Cl} = 35.45\ 	ext{u}$?

Accepted Answer

$58.44\ 	ext{u}$

Question 12

Which of the following is the correct name for $	ext{KNO}_3$?

Accepted Answer

Potassium nitrate

Question 13

Which of the following is the correct formula for calcium carbonate, the active ingredient in antacids?

Accepted Answer

$	ext{CaCO}_3$

Question 14

What is the correct name for $	ext{N}_2	ext{O}$, commonly known as laughing gas?

Accepted Answer

Dinitrogen monoxide

Question 15

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

Accepted Answer

$	ext{MgO}$

Question 16

Which of the following is the correct name for $	ext{HCl(aq)}$?

Accepted Answer

Hydrochloric acid

Question 17

Which of the following is the correct formula for sodium hypochlorite, the active ingredient in household bleach?

Accepted Answer

$	ext{NaClO}$

Question 18

Which of the following is the correct name for $	ext{Fe(NO}_3)_3$?

Accepted Answer

Iron(III) nitrate

Question 19

Which of the following is the correct formula for ammonium nitrate, a compound containing both a polyatomic cation and a polyatomic anion?

Accepted Answer

$	ext{NH}_4	ext{NO}_3$

Chapter 5: Molecules and Compounds – Structure, Classification, and Nomenclature

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