Unit 9 Test Chemistry McDade

A solution in which more solute is dissolved than is typically soluble at a given temperature is-

• Unsaturated

• Saturated

• Supersaturated

• Diluted

To make 2.00 L of 0.300 M sulfuric acid, how many mL of a 1.00 M stock solution should be used?

• 1.50*10^2

• 6.00*10^2

• 6.67*10^2

• 1.50*10^3

What will happen to the ability of a solid to dissolve in a liquid if the temperature increases?

• Solubility of the solid always increases

• Solubility of the solid always decreases

• Solubility of the solid usually increases

• Solubility of the solid usually decreases

A sample of 0.0255 mol potassium hydroxide, KOH, was dissolved in water to yield 10.0 mL of solution. What is the morality of the solution?

• 2.55 M

• 2.55*10^-3 M

• 392M

• 0.392 M

An aqueous solution is made from 0.315 mol of Na2Cr2O7. If the volume of the solution is 25.0 mL, what is the molarity of the solution?

• 2.22 M

• 20.5 M

• 12.6 M

• 10 M

The label is missing from the stock solution of sodium hypochlorite. Consulting partial lab notes, you find that you prepare a 0.49 M solution of sodium hypochorite by adding 67.0 mL of the stock solution to water to make a total volume of 0.55 L. What must the concentration have been the stock solution?

• 1

• 2

• 3

• 4

How many mL of stock NH3 is needed to make 100.0 mL of 1.00M NH3? Your stock solution is 14.8 M.

• 6.76

• 148

• .148

• .676

Water can dissolve many substances because-

• it has the molecular formula H2O

• it has a linear molecular shape

• It has a nonpolar molecular structure

• it has a partial charge on each side of its molecules

Why is water sometimes called the "universal solvent"?

• The adhesion level in H2O is very high

• Many substances dissolve in H2O

• the density of H2O is 1.0 g/cm3

• The hydrogen bonding of H2O is very low.

In Flint, Michigan, toxic lead metal was found in the water and it needs to be filtered out in order for the city to have clean and safe drinking water. A company is proposing a solution where they mix negative ions into the water to bond with the Pb+2 ions and form an insoluble solid that can be filtered out. Which of the following compounds contains ions that could be used in order to form a precipitate with lead?

• NaNO3

• K2SO4

• HC2H3O2

• NaClO2