Chem- Chapter 9 Exam Part 1

0.50 mole of NaCl is added to 1.0 kg of water. The freezing point of the solution will be ________. 1.86 °C 0.00 °C -0.93 °C 0.93 °C -1.86 °C

-1.86 °C

What is the osmolarity of a solution made by dissolving 25.0 g of the strong electrolyte KCl in 1.0 L of solution? 1.34 Osm 0.168 Osm 0.670 Osm 0.250 Osm 0.335 Osm

0.670 Osm

If 100. mL of water is added to 25 mL of 5.0 M NaCl, the final concentration is __________. 25 M 5.0 M 2.0 M 1.3 M 1.0 M

1.0 M

What is the osmolarity of a solution made by dissolving 0.50 mole of the strong electrolyte CaCl2 in 1.0 L of solution? 2.0 Osm 1.5 Osm 0.50 Osm 0.0 Osm 1.0 Osm

1.5 Osm

How many equivalents are present in 5.0 moles of Al3+? 0.67 Eq 5.0 Eq 15 Eq 3.0 Eq 1.3 Eq

15 Eq

What is the concentration, in mass percent, of a solution prepared from 50.0 g NaCl and 150.0 g of water? 40.0% 25.0% 33.3% 3.00% 0.250%

25.0%

Use the reaction: 2AgNO3(aq) + H2SO4(aq) → Ag2SO4(s) + 2H2O(l) What volume of 0.123 M AgNO3(aq) is needed to form 0.657 g of Ag2SO4(s)? 10.7 mL 53.4 mL 34.2 L 17.1 mL 34.2 mL

34.2 mL

Which one of the following compounds will NOT be soluble in water? LiOH K2S BaSO4 NaNO3 MgCl2

BaSO4

Which one of the following compounds will be insoluble in water? NH4Cl Pb(C2H3O2)2 AgNO3 CaCl2 CaCO3

CaCO3

Hydrogen bonds are a major factor in the structure of DNA. hydrogen chloride. dry ice. air. table salt.

DNA

The O-H bond in water is polar because hydrogen is much more electronegative than oxygen. it is a hydrogen bond. oxygen is much more electronegative than hydrogen. it is an ionic bond. oxygen occupies more space than hydrogen.

oxygen is much more electronegative than hydrogen.

In the process known as osmosis, __________ moves through a semipermeable membrane into an area of __________ concentration. solute; lower solute solvent; lower solute solute; higher solute solvent; higher solvent solvent; lower solvent

solvent; lower solvent

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles is called solvation. osmotic pressure. dilution. dialysis. hydration.

dialysis

The mass/volume percent concentration refers to grams of solvent in 100 mL of solution. grams of solute in 1 L of solution. grams of solute in 100 mL of solution. grams of solute in 1 L of solvent. grams of solute in 100 mL of solvent.

grams of solute in 100 mL of solution.