Holt Ch 12 PPT

Multiple Select

Which of the following statements about colloids are correct?

• Colloids look similar to solutions because their particles cannot be seen.

• Colloids can be distinguished from solutions using the Tyndall effect.

• Colloids always settle out upon standing.

• Colloids can be separated by filtration.

Fill in the Blank

When a solute is first added to a solvent, solute molecules leave the solid surface and move about at ___ in the solvent.

Multiple Choice

Which of the following is a correct comparison between electrolytes and nonelectrolytes?

• Electrolytes conduct electricity, while nonelectrolytes do not.

• Nonelectrolytes dissolve in water, while electrolytes do not.

• Electrolytes are always solids, while nonelectrolytes are always liquids.

• Nonelectrolytes are more common than electrolytes in nature.

Open Ended

Compare and contrast the particle models of 24-karat gold and 14-karat gold alloy.

Open Ended

Why is it important to understand the differences between solutions, suspensions, and colloids in everyday life?

Multiple Select

Which of the following are examples of solid solutions?

• Brass (zinc and copper)

• Sterling silver (silver and copper)

• Sugar dissolved in water

• Ethanol dissolved in water

Fill in the Blank

The dissolving medium in a solution is called the ___ .

Multiple Choice

What is a solution?

• A homogeneous mixture of two or more substances in a single phase

• A mixture where the components are easily separated

• A substance that cannot be dissolved in water

• A solid formed from two metals

Multiple Choice

What is a suspension?

• A mixture in which particles settle out unless constantly stirred

• A homogeneous mixture of two or more substances

• A mixture with particles too small to settle out

• A solution of two metals

Multiple Choice

Which statement best describes a colloid?

• A mixture with particles intermediate in size between those in solutions and suspensions

• A mixture in which particles settle out quickly

• A homogeneous mixture of two or more substances

• A mixture of two metals

Multiple Choice

Which of the following best describes the Tyndall effect?

• Light is absorbed by colloidal particles.

• Light is scattered by colloidal particles in a transparent medium.

• Light passes straight through a colloid without any effect.

• Light is reflected by the surface of a colloid.

Open Ended

Explain why sodium chloride solution and hydrochloric acid solution conduct electricity better than sucrose and acetic acid solutions.

Fill in the Blank

A substance that dissolves in water to give a solution that conducts electric current is called an ___.

Multiple Choice

Which of the following solutions best conducts electricity, as shown in the images?

• Sucrose solution

• Acetic acid solution

• Sodium chloride solution

• Hydrochloric acid solution

Multiple Choice

Which of the following is an example of a nonelectrolyte?

• Sodium chloride

• Sugar

• Potassium nitrate

• Calcium chloride

Multiple Choice

Which of the following actions will increase the rate of dissolution of a solid solute in a solvent?

• Increasing the surface area of the solute

• Decreasing the temperature

• Not stirring the solution

• Using a nonpolar solvent for a polar solute

Open Ended

Describe how temperature affects both the rate of dissolution and the solubility of a solid solute in a solvent, using examples from the lesson.

Multiple Choice

What determines the maximum amount of solid that can dissolve in a solvent at a given temperature?

• The amount of solvent only

• The nature of the solute, the nature of the solvent, and the temperature

• The pressure only

• The stirring rate only

Multiple Select

Which statements about solubility are supported by the diagrams and descriptions in the first two slides?

• Lithium chloride is soluble in water.

• Toluene is insoluble in water.

• Lithium chloride is insoluble in toluene.

• Water and toluene do not mix well.

Multiple Choice

Which of the following combinations results in a soluble solution according to the particle model diagrams?

• Water and lithium chloride

• Toluene and lithium chloride

• Water and toluene

• Toluene and water

Open Ended

Explain the concept of solution equilibrium and how it relates to the rates of dissolution and crystallization.

Multiple Choice

What happens if more solute is added to a saturated solution?

• It dissolves completely.

• It falls to the bottom and does not dissolve.

• It reacts with the solvent.

• It evaporates.

Multiple Choice

According to the graph, what is the solubility of NaCH3COO in 100 g of water at 20°C?

• 20.0 g/100 g

• 46.4 g/100 g

• 60.0 g/100 g

• 100.0 g/100 g

Multiple Choice

Which of the following best describes your understanding of the differences between suspensions, colloids, and solutions after this lesson?

• I can clearly compare their properties and give examples.

• I understand some differences but need more practice.

• I am still confused about their differences.

• I did not learn about these topics.

Open Ended

What is one key difference between electrolytes and nonelectrolytes that you learned in this lesson?