What is it about the water molecule that makes it a great solvent?
water demonstrates polarity; a partial charge on each side of the molecule
due to its molecular formula
it has a liner molecular shape
due to it's non-polar molecular structure
2. Multiple Choice
1 minute
1 pt
What is the correct formula to solve for the Molarity of a solution that has .4 moles of HCl in 9.5 L of solution?
M = 9.5 L / .4 mol
M1V1=M2V2
M = .4 mol / 9.5 L
none of the other choices
3. Multiple Choice
45 seconds
1 pt
A sample of 0.0255 mol potassium hydroxide, KOH, was dissolved in water to yield 10.0 mL of solution. Which amount would you need to change to solve for molarity?
change .0255 moles to grams
change 10 mL to L
change both values to grams and L
leave it as it is
4. Multiple Choice
1 minute
1 pt
A questions asks, "what volume of 0.125 M KMnO4 is required to yield 0.180 mol of potassium permanganate, KMnO4?" What is the correct formula set up to solve for this problem?
.125 M = .180 mol / L
M1 V1 = M2 V2
.125 M = L / .180 mol
none of the choices listed
5. Multiple Choice
45 seconds
1 pt
Which formula should you use to convert 2.00 L of 0.300 M sulfuric acid, how many mL of a 1.00 M stock solution should be used?
molarity formula
dilution formula
both will work
neither will work
6. Multiple Choice
45 seconds
1 pt
Which of the following would result in being able to dissolve a greater amount of gas in a solution?
Heat the gas and solution
Decrease the pressure of the solution
Make the gas an electrolyte
Cool the gas and solution
7. Multiple Choice
1 minute
1 pt
90 grams of sodium nitrate (NaNO3) are put into 100 grams of water and stirred. The final mixture has a temperature of 20°C. About how many grams of the sodium nitrate dissolved?
23
73
80
88
8. Multiple Choice
1 minute
1 pt
Students are asked to make statements about the solubility graph above. Which student does the best job of communicating the general features of the graph?
Most salts require 100 grams of water in order to dissolve completely.
Table salt has the average solubility of all salts.
The solubility of most salts increases with increasing temperature.
Most curves show a decreasing slope as the temperature rises.
9. Multiple Choice
45 seconds
1 pt
Which of the following would decrease the rate of solution when dissolving a solid in water?
Raise the temperature of the solution
Crush the solid before mixing
Stir the solution after mixing
Use a single cube of solid
10. Multiple Choice
45 seconds
1 pt
Which of the following is the best way to determine if an aqueous solution is supersaturated?