Chemistry homework answers chapter 3

Exercise 3.28: Problems by Topic - Chemical Formulas and Molecular View of Elements and Compounds
Part A
Which of the following elements have molecules as their basic units?
Check all that apply.
ANSWER:
fluorine

lead

nitrogen

bromine

Correct
Exercise 3.30: Problems by Topic - Chemical Formulas and Molecular View of Elements and Compounds
Classify each of the following compounds as ionic or molecular.
Part A
CF2Cl2
ANSWER:
molecular

ionic

Correct
Part B
CO
ANSWER:
ionic

molecular

Correct
Part C
ClO2
ANSWER:
ionic

molecular

Correct
Part D
NI3
ANSWER:
molecular

ionic

Correct
Exercise 3.34: Problems by Topic - Formulas and Names for Ionic Compounds
Write a formula for the ionic compound that forms between each of the following pairs of elements.
Part A
caesium and chlorine
Express your answer as a chemical formula.
ANSWER:
Correct
Part B
aluminum and nitrogen
Express your answer as a chemical formula.
ANSWER:
Correct
Part C
sodium and oxygen
Express your answer as a chemical formula.
ANSWER:
Correct
Part D
barium and bromine
Express your answer as a chemical formula.
ANSWER:
Correct
Exercise 3.46: Problems by Topic - Formulas and Names for Ionic Compounds
Write a formula for each of the following ionic compounds.
Part A
lead(II) chloride
Express your answer as a chemical formula.
ANSWER:
Correct
Part B
iron(II) iodate
Express your answer as a chemical formula.
ANSWER:
Correct
Part C
potassium chromate
Express your answer as a chemical formula.
ANSWER:

Correct
Part D
potassium fluoride
Express your answer as a chemical formula.
ANSWER:
Correct
Part E
iron(III) hydroxide
Express your answer as a chemical formula.
ANSWER:
Correct
Part F
calcium phosphate
Express your answer as a chemical formula.
ANSWER:
Correct
Exercise 3.52: Problems by Topic - Formulas and Names for Molecular Compounds and Acids
Write a formula for each of the following molecular compounds.
Part A
dichlorine hexoxide
Express your answer as a chemical formula.
ANSWER:
Correct
Part B
dichlorine monoxide
Express your answer as a chemical formula.
ANSWER:

Correct
Part C
dinitrogen trioxide
Express your answer as a chemical formula.
ANSWER:
Correct
Part D
diboron hexahydride
Express your answer as a chemical formula.
ANSWER:
Correct
Part E
diboron tetrachloride
Express your answer as a chemical formula.
ANSWER:
Correct
Exercise 3.58: Problems by Topic - Formula Mass and the Mole Concept for Compounds
Calculate the formula mass for each of the following compounds.
Part A
MgBr2
Express your answer using two decimal places.
ANSWER:
Correct
Part B
H3PO4
Express your answer using two decimal places.
ANSWER:
All attempts used; correct answer displayed
Part C
CBr4
Express your answer using two decimal places.
ANSWER:
Answer Requested
Part D
FeCl2
Express your answer using two decimal places.
ANSWER:
Answer Requested
Exercise 3.66: Problems by Topic - Composition of Compounds
Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds.
Part A
N2O5
Express your answer using four significant figures.
ANSWER:
Answer Requested
Part B
Si3N4
Express your answer using four significant figures.
ANSWER:
Correct
Part C
NO2
Express your answer using four significant figures.
ANSWER:
Correct
Part D
HNO3
Express your answer using four significant figures.
ANSWER:
Correct
Exercise 3.72: Problems by Topic - Composition of Compounds
The American Dental Association recommends that an adult female should consume 3.0 mg of fluoride (F−) per day to prevent tooth decay.
Part A
If the fluoride is consumed as sodium fluoride (45.24% F), what amount of sodium fluoride contains the recommended amount of fluoride?
Express your answer using two significant figures.
ANSWER:
Correct
Exercise 3.80: Problems by Topic - Chemical Formulas from Experimental Data
Samples of several compounds are decomposed and the masses of their constituent elements are shown below. Calculate the empirical formula for each compound.
Part A
1.245 g Ni, 5.381 gI
Express your answer as a chemical formula.
ANSWER:
Answer Requested
Part B
2.677 gBa, 1.382 g Cl
Express your answer as a chemical formula.
ANSWER:

Correct
Part C
14.980 g Cu, 7.557 gS, 15.107 gO
Express your answer as a chemical formula.
ANSWER:

Correct
Exercise 3.86: Problems by Topic - Chemical Formulas from Experimental Data
The molar mass and empirical formula of several compounds are listed below. Find the molecular formula of each compound.
Part A
C4H9, 114.27 g/mol
Express your answer as a chemical formula.
ANSWER:
Correct
Part B
CCl, 189.82 g/mol
Express your answer as a chemical formula.
ANSWER:
Correct
Part C
C3H2N, 208.25 g/mol
Express your answer as a chemical formula.
ANSWER:
Answer Requested
Exercise 3.94: Problems by Topic - Writing and Balancing Chemical Equations
When iron rusts, solid iron reacts with gaseous oxygen to form solid iron(III) oxide.
Part A
Write a balanced chemical equation for this reaction.
Express your answer as a chemical equation. Identify all of the phases in your answer.
ANSWER:
Answer Requested
Exercise 3.119: Cumulative Problems
Combustion analysis of a 13.42-g sample of estradiol (which contains only carbon, hydrogen, and oxygen) produced 39.01 g CO2 and 10.65 g H2O. The molar mass of estradiol is 272.38 g/mol .
Part A
Find the molecular formula for estradiol.
Express your answer as a chemical formula.
ANSWER:
Answer Requested
Exercise 3.60: Problems by Topic - Formula Mass and the Mole Concept for Compounds
Calculate the mass (in g) of each of the following.
Part A
5.59×1020 SO3 molecules
ANSWER:
Answer Requested
Part B
2.4×1022 H2O molecules
Express your answer using two significant figures.
ANSWER:
m2 = 0.72 g
Answer Requested
Part C
4.8×1025 O3 molecules
Express your answer using two significant figures.
ANSWER:
Answer Requested
Part D
9.77×1019 CCl2F2 molecules
ANSWER:
Correct