Chemistry 101 Exam 2 (Travis Varner)

polar covalent bond

when 2 non metal atoms share electronegativity

ionic bonds

difference in electronegativity is large, occurs between a metal and nonmetal

non polar covalent bond

difference in electronegativity is 0 occurs between two of the same non metals or between carbon and hydrogen

1

mono

2

di

3

tri

4

tetra

5

penta

6

Hexa

7

hepta

8

octa

9

nona

10

deca

formal charge

# of valence electrons - # dots - # lines

hydrogen bonding

one molecule with a H-N, H-O, or H-F bond and a second molecule with a N,O, or F atom

calcium nitrate

Ca(NO3)2

chromium(II) oxide

CrO

aluminum carbonate

Al2(CO3)3

iron(II) chloride

FeCl2

K2O

Potassium oxide

CoCl3

Cobalt(III) chloride

Fe(NO3)3

Iron(III) nitrate

NH4ClO

Ammonium Perchlorate

Covalent, Ionic, or both
HC2H3O2

covalent

Covalent, Ionic, or both
CaSO4

both

Covalent, Ionic, or both
MgCl2

ionic

polar, nonpolar, or ionic
Si-Si

nonpolar

polar, nonpolar, or ionic
S-C

polar

polar, nonpolar, or ionic
Rb-O

ionic

How many moles of elemental oxygen gas (O2) must react with elemental phosphorus (P4) to produce 62.3 moles of diphosphorus pentoxide?

How many moles of elemental oxygen gas are required to produce 56.9 moles of nitrogen monoxide?

How many moles of hydrogen atoms are present in 13.9 moles of ammonia (NH3)?

155.8
28.5
41.7

4 grams of a gas at 200 K and 8 atmospheres occupies a volume of 20 liters. Use relationships from Avogadro's law, Boyle's law, Charles's law, and the ideal gas law to solve this problem.

160

To what temperature must a 2.24 L container filled with 9.39 g of Kr be heated in order to obtain a pressure of 1.22 atm?

297

What mass of helium is required to fill a 1.41-L balloon at 47.49°C and 5.00 atm?

1.07

What are the concentration and pressure of Ar in a 26.0-L flask at 480. K that contains 21.0 g of Ar?

concentration - 0.0202

pressure - 0.796

Indicate which molecule (a or b) in each pair has the higher boiling point. Also indicate which force, hydrogen bonding (H), dipolar (P), or dispersion (D) is most responsible for the difference. For part 2 of this problem, you can see the Lewis structures for those molecules listed at the bottom of this problem.
NH3 or PH3

NH3
hydrogen bonding

Indicate which molecule (a or b) in each pair has the higher boiling point. Also indicate which force, hydrogen bonding (H), dipolar (P), or dispersion (D) is most responsible for the difference. For part 2 of this problem, you can see the Lewis structures for those molecules listed at the bottom of this problem.
C4H8 or C10H20

C10H20
dispersion

Indicate which molecule (a or b) in each pair has the higher boiling point. Also indicate which force, hydrogen bonding (H), dipolar (P), or dispersion (D) is most responsible for the difference. For part 2 of this problem, you can see the Lewis structures for those molecules listed at the bottom of this problem.
HCl or F2

HCl
dipole-dipole

What mass of KCl is required to make 47.0 mL of a 0.260 M KCl solution?

How many moles of potassium ions are present in the solution?

0.894
0.012

a) How many moles of Al2(SO4)3 are required to make 59 mL of a 0.060 M Al2(SO4)3 solution? Remember that 1000 mL = 1 L.

What mass of Al2(SO4)3 is required to make 59 mL of a 0.060 M Al2(SO4)3 solution?

How many moles of sulfate ions are present in the solution?

0.00354
1.21
0.01062

What is the sodium ion concentration in a solution prepared by mixing 0.354 mol Na2SO4 in enough water to make 1.40 L of solution?

0.506

Write the chemical formula of the precipitate (not the net ionic equation) that would form when the following solutions are mixed, or write "NONE" if no precipitate would be produced.

sodium chromate + nickel(II) iodide

NiCrO4

Write the chemical formula of the precipitate (not the net ionic equation) that would form when the following solutions are mixed, or write "NONE" if no precipitate would be produced.

sodium sulfide + iron(III) chloride

Fe2S3

Write the net ionic equation (not just the chemical formula of the precipitate) for the reactions that occur when solutions of the following salts are mixed. (Enter "NONE" if no reaction occurs. Use the lowest possible whole number coefficients. Omit states-of-matter from your answer.)

K3PO4 + Cu(ClO4)2

3Cu2+ + 2PO
3-4 →Cu3(PO4)2

phase diagram

You need to prepare 4.0 L of a 2.0M N(CH3 )3 solution in water.
How many L of N(CH3 )3 are needed?
How many L of water are needed?

Density of N(CH3 )3 670 grams/L
Molar mass of N(CH3 )3 59.11 grams/mole

Density of water 1000 grams/L
Molar mass of water 18.02 grams/mole

0.71
3.29

hydrophobic tail

Water fearing

hydrophilic head

water loving