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Lesson 3-5: The Water Molecule and Solubility

Page history last edited by mariaelizabethbunn@... 5 years, 7 months ago
Time   Developing the Ideas--Lesson  
Engaging the Student (Entry Task) 
Student Handout 
Teacher/Lesson Notes
Materials

Checking for Understanding

2 class periods

DAY 1: One very hot day, Dalilah decides to set up a lemonade stand. 

She begins with the following ingredients:

  • 1 cup of sugar
  • 1 liter of water
  • 1/8 liter of lemon juice

 

After it is all mixed, Dalilah decides it is not sweet enough.  So she adds 2 more cups of sugar. After stirring, she notices that there is still a lot of sugar resting on the bottom of the pitcher. 

A. Why is there still sugar on the bottom?
B. What can she do to fix the problem?

 

Dalilah now wants to make a large amount of lemonade that is as sweet as possible.  She knows she will use 8 liters of water and 1 liter of lemon juice. 

Is it possible for Dalilah to determine ahead of time how much sugar to add to the 8 liters of water and 1 liter of lemon juice without adding too much?

DAY 1:

Day 2:

Learning Targets:

  • Understand that solubility is a characteristic property of matter. 
  • Solubility is the maximum mass of a solute that can be dissolved in a given volume of solvent at a particular temperature.
  • Explain that concentration is a concentration of mass of solute per volume of solvent.  
  • Identify a substance based on the characteristic property of solubility 
  • Know that a solute is soluble in a solvent if some amount can completely dissolve. 

 

DO NOT introduce the vocabulary of solubility and saturation.  These concepts are developed in this lesson AND THEN the vocabulary is introduced to the students.

 

DAY 1:

  1. Ask students to answer the warm-up questions in their notebooks. Then have them share their ideas with another student.
  2. Pass out and complete the Day 1 Measuring Solubility student handout.

 

Day 2:

  1. Have students share their answers for part III of Day 1's handout.
  2. Pass out and complete the Day 2 Temperature Effects on Solubility handout.

 

  • Test tube
  • Rubber stopper
  • Sugar
  • Water
  • Balance
  • Weighing dish

 

 

 

 

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