Chapter 16 Key Concepts Flashcards Preview

Chemistry Chapters 16-20 > Chapter 16 Key Concepts > Flashcards

Flashcards in Chapter 16 Key Concepts Deck (10):
0

What determines whether a substance will dissolve? What determines how fast a substance will dissolve?

The compositions of the solvent and the solute; stirring (agitation), temperature, and surface area

1

What units are usually used to express the solubility of a solute?

Grams of solute per 100g of solvent

2

What are two conditions that determine the mass of solute that will dissolve in a given mass of solvent?

Temperature and pressure

3

How do you calculate the molarity of a solution?

Divide the moles of solute by the volume of the solution (in liters)

4

Compare the number of moles of solute before dilution with the number of moles of solute after dilution.

Diluting a solution reduces the number of moles of the solute per unit volume, but the total number of moles of solute in solution does not change.
Moles of solute= M1xV1=M2xV2

5

What are two ways of expressing the concentration of a solution as a percent?

The ratio of the volume of the solute to the volume of the solution or the ratio of the mass of the solute to the mass of the solution

6

What are the three colligative properties of solutions?

Vapor-pressure lowering, boiling-point elevation, and freezing-point depression

7

What factor determines how much the vapor pressure, freezing point, and boiling point of a solution differ from those properties of the pure solvent?

The number of solute particles dissolved in the solvent

8

What are two ways of expressing the ratio of solute particles to solvent particles?

Unit molality and mole fractions

9

How are freezing point depression and boiling point elevation related to molality?

They are directly proportional to the molal concentration when the solute is molecular, not ionic