Download Upon completion of Chapter 7, you should be able to

Chapter 7 Objectives
Reading Assignment: 219-249
Review Assignment:p 234 Practice; PP 253 (40, 41, 42 (a,c), 43 (a, b), 44, 45 , 47 (b), 48, 52
Upon completion of Chapter 7, you should be able to:
1.
Give number of atoms of components of a chemical formula:
C2H4
a.
b. Al2O3
c. CuSO4
d. (NH4)3PO4
2.
Give names and/or formulas for ionic compounds:
a. zinc oxide
b. barium oxide
c. aluminum nitrate
d. KI
e. Al2O3
f. Ca3(PO4)2
3.
4.
Assign oxidation numbers to the each of the elements in # 1 and # 2.
Write names and formulas for molecular compounds using numerical prefixes
a. carbon tetraiodide
b. iodine trichloride
c. dinitrogen trioxide
d. P4O10
e. N2O5
f. SF6
5.
6.
Name binary acids and oxyacids.
a.
HBr
b.
H2CO3
c.
H2SO4
d.
HCl
Be able to give the name of the anion found in oxyacids ending in ic acid:
a. acetic acid
b. nitric acid
c. sulfuric acid
7.
Calculate the formula mass of any given compound. Calculate the molar mass of the
same compound.
a. HNO3
b. Al(NO3)3
8.
Use molar mass as a conversion factor.
a. Convert from 25 grams of water to moles.
b. Convert from 25 moles of water to grams.
9.
Calculate number of molecules, formula units, or ions in given molar amount of a
chemical compound or calculate moles from given mass of compound.
a. 6.60 g (NH4)2SO4 to moles
b. 2 mol (NH4)2SO4 to cations
c. 4.5 g CO2 to molecules
d. 4.5 g CO2 to atoms of C and atoms of O
10.
Use percentage composition to determine the formula of an unknown sample.
A sample has been found to consist of 54% calcium, 43.2 percent oxygen, and 2.70
percent hydrogen. What is its empirical formula?
11.
Find molecular formulas.
A compound has been found to have an empirical formula of CH. Its molar mass is 78
g/mol. What is the molecular formula of the compound?
Answers to worksheet that are attached to your objectives for Chapter 7
1. 0.0656 mol copper (II) nitrate
2. 3.95 x 1022 f.u.
3. 3.95 x 1022 cations
4. 7.89 x 1022 anions
5. 660 g copper (II) nitrate
6. 2.1 x 1024 f.u.
7. 897 g sulfur dioxide
8. 8.43 x 1024 molecules
9. skip but answer is 314 L
10. skip but answer is 11 g
11. 8.3 mol
12. 12. 33.8% Cu; 14.9% N; 51.2% O
13. 50.0% S; 50.0% O
Copper (II) nitrate: molar mass 187.6 g/mol
Sulfur dioxide: molar mass 64.06 g/mol
1.
Copper (II) nitrate: molar mass 187.6 g/mol
Sulfur dioxide: molar mass 64.06 g/mol
Copper (II) nitrate: molar mass 187.6 g/mol
Sulfur dioxide: molar mass 64.06 g/mol
1. If you had 12.3 g of copper (II) nitrate, how many moles would you have?
2. How many formula units are present in 12.3 g of copper (II) nitrate?
3. How many cations?
4. How many anions?
5. If you had 3.5 moles of copper (II) nitrate, how many grams would you have?
6. How many formula units?
7. If you had 14.0 mol of sulfur dioxide, how many grams of sulfur dioxide would you have?
Copper (II) nitrate: molar mass 187.6 g/mol
Sulfur dioxide: molar mass 64.06 g/mol
8. How many molecules of sulfur dioxide are in 14.0 moles?
9. How many liters at STP would 14.0 moles of sulfur dioxide occupy?
10. If you had 4.0 liters of sulfur dioxide, how many grams would you have?
11. If you had 5.0 x 1024 molecules of sulfur dioxide, how many moles would you have?
12. What is the percent composition of copper (II) nitrate?
13. What is the percent composition of sulfur dioxide?