Chapter 10
Put the following in order of decreasing electronegativity:
chlorine, fluorine, neon, oxygen
fluorine, oxygen, chlorine, neon
Convert 961 torr into atm
1.26 atm
Given HF and HBr:
list the intermolecular forces for each
indicate which would have the higher boiling point
indicate which has the higher vapor pressure
HF: London dispersion, dipole-dipole, hydrogen
HBr: London dispersion, dipole-dipole
HF has the higher BP.
HBr has the higher VP.
Sugar is dissolved in water. Which is the solvent and which is the solute?
Water is the solvent, sugar is the solute.
Which one of the following is a weak base?
NaOH NH3 KOH CH3COOH HC2H3O2
NH3
Name the molecular geometry of SBr2.
Bent
A sample of gas occupies 3.50 liters volume at 20.˚C. What volume will the gas occupy at 100.˚C ?
4.46 L
A puddle of chemical A disappears much faster than an equal sized puddle of chemical B. What can we say about chemical A's vapor pressure, compared to chemical B's?
Chemical A has a higher vapor pressure.
Prepare a % (w/w) label for a solution of 19 g water and 6.0 g sugar.
24% (w/w)
Which of the following events will normally DECREASE the rate of a reaction?
add catalyst
cool reaction
add more reactants
increase pressure
cool reaction
What is the molecular geometry if you have just four single bonds and no lone pairs around the central atom of a simple molecule?
Tetrahedral
Suppose a chemical reaction run under STP conditions produced 2.00 moles of gas. How many LITERS of gas would this be?
44.8 L
On the molecule HF, which side has a partial positive charge?
The hydrogen side
What would have a lower freezing point, and why?
MgCr2O7 or CaCl2
CaCl2 (more particles = more colligative properties.)
TRUE or FALSE: In a Reaction Diagram for an exothermic reaction, the "products" are located lower on the diagram than the "reactants" are.
TRUE
The correct Lewis structure for PBr3 has exactly ___ single bonds.
3
Which of the following gases have the highest density?
Ne
H2
He
O2
O2
You boil water on a high mountaintop, then place a raw egg into the boiling water. When compared to boiling water in St. Louis,:
The water on the mountaintop boils at a ________ temperature and you would have to boil the egg for a ________ time.
lower, longer
Describe what would happen to a red blood cell (0.9% NaCl concentration) submerged in an 11% NaCl solution.
crenation: water would flow out of the cell through its semipermeable membrane and into the higher concentration solution. The cell would appear wrinkled and deflated.
Determine the pOH of 0.001 M hydrochloric acid
11
Which of these compounds would dissolve readily in water based on their Lewis structures?
SiO2
NH3
CBr4
NH3
A sample of 0.740 mole of gas has a volume of 748 mL at 28 ˚C. Calculate the pressure of this gas. (R = 0.0821 L atm / mol K)
24.4 atm
How many joules of heat are needed to completely vaporize 24.4 grams of water? (Assume the water is at its boiling point and now needs energy to vaporize.)
GIVEN: ∆Hvap for water = 40.7 kj / mol
55100 j
What is the molarity of a solution prepared by dissolving 8.70 grams of NaI into enough water to make 250 mL of solution?
0.23 M
Use your calculator to calculate the pH of a 0.013 M acid solution.
1.89