A. WORK-OUT PROBLEMS:
Write formulas for the following:
Give the complete electron configurations of: S, O2-, and Mn.
For the following molecules/ions, give the Lewis structure, molecular geometry, and electron pair geometry: NO2-
Write Lewis structures to represent all resonance forms of CO32-.
5. How many joules of heat energy are lost when a 100-gram sample of a metal (with a specific heat of 0.312 J/(gºC) cools from 80.0ºC to 30.0ºC?
Calculate the number of moles in:
4.20 X 1024 molecules of SO2
240 grams of NaOH
5.00 liters of H2 gas at 0ºC and 1.00 atm.
1.7 liters of Ar gas at STP
7. How many grams of AlCl3 can be prepared from 50.0 g of Al and 100.0 g of Cl2 according to the equation: 2 Al + 3 Cl2 2 AlCl3 ?
How many neutrons are there in 131I?
Which bond is the most polar?
Circle the molecules that are polar (have a dipole moment):
How many unpaired electrons does the Si atom have?
Write the correct Lewis structure for CS2.
Write the formal charges on each atom in [F-S=F]2+ (lone pairs are not shown).
How many ions are formed when Ca3(PO4)2 dissolves?
How many protons, neutrons, and electrons are there in 19F- ion?
Discuss the properties of molecules used as liquid crystals. (ignore this question)
What is the molarity of the solution made when 1.25 grams of sodium chloride are dissolved in 500 mL of water?
What is the hybridization of the carbon atom C2H2 ?
What is the molecular formula of a compound with 30.5% N and 69.5% S, and it has a molar mass of 184 g/mol?
How many electrons are found at the sublevel 1=2?
How many sigma and how many pi bonds does carbon dioxide have?
How many milliliters of 2.5M solution are needed to prepare 500 mL of 0.08M solution?
How many milliliters of 1.25M hydrochloric acid are needed to neutralize 50.0 millimeters of 0.55M barium hydroxide?
The vapor pressure of SiCl4 is 100 mmHg at 5.4ºC and the normal boiling point is 56.8ºC. What is ΔHvap for SiCl4 in kJ/mol?
B. MULTIPLE CHOICE
A 34.6 g sample of calcium oxide is
a. 0.0346 mol
b. 0.617 mol
c. 1.23 mol
d. 34.6 mol
2. When the following equation is balanced, the total number of nitrogen atoms on the reactant side is:
BaCl2(aq) + AgNO3(aq) Ba(NO3)2(aq) + AgCl(s) a. 2
Given that 4 HNO3(aq) 4NO2(aq) + 2 H2O(l) + O2(g), the amount of NO2 which could be produced from 3.00 mol HNO3 is: a. 138 g
b. 177 g
c. 184 g
d. 236 g
Given that 3 CuCl2(aq) + 2 Al(s) 3 Cu(s) + 2 AlCl3(aq), the amount of Al required to produce 42.4 g of Cu is: a. 12.0 g
c. 40.5 g
d. 42.4 g
The type of substance least likely to appear as a product in a net ionic equation is a soluble salt
c. a weak electrolyte
an insoluble salt
d. an insoluble gas
When a solution of NiBr2 is mixed with a solution of (NH4)2CO3 the net ionic equation is:
a. NiBr2(aq) + (NH4)2CO3(aq) NiCO3(s) + 2 NH4Br(aq)
b. Ni2+ (aq) + 2Br- (aq) 2 NH4+ (aq) + CO32- (aq) NiCO3(s) + 2 NH4+ (aq) + 2 Br- (aq) c. Ni2+ (aq) + CO32-(aq) NiCO3(s)
d. Br-(aq) + NH4+ (aq) NH4Br(aq)
When a sample of chlorine gas at 35º C doubles in volume, its pressure stays the same
c. is half as great
d. increases fourfold
A 385-mL sample of oxygen gas collected at 747 mm Hg and 27.4ºC would occupy what volume at STP? a. 344 mL
b. 356 mL
c. 416 mL
d. 431 mL
A 9.74 g sample of CO2 will occupy 6.37 L at 0.829 atm only if the temperature is a. 17.6ºC
d. above 100ºC
A sample of N2 would obey the ideal gas law most closely at
0.68 atm and –68ºC
c. 680 atm and –68ºC
0.68 atm and 680ºC
d. 680 atm and 680ºC...
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