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Concentration

Time Frame:
1 class period that runs 60 minutes.

Group Size:
Small Groups


 

Summary:
Students will increase the concentration of salt in a solution and note when the solution goes from dilute to concentrated to saturated.

Main Curriculum Tie:
Science - Chemistry
Standard 6 Objective 1

Describe factors affecting the process of dissolving and evaluate the effects that changes in concentration have on solutions.

Materials:

  • student sheet (attached)
  • 2 test tubes
  • balance
  • salt
  • test tube rack
  • graduated cylinder

Attachments

Background For Teachers:
This is an introductory lab to familiarize students with the vocabulary of solutions.

Instructional Procedures:

  1. If students are unfamiliar with the necessary vocabulary, create flashcards with the terms: solution, solute, solvent, concentration, percent concentration, concentrated, saturated, dilute, precipitate and dissolve. The terms will be used without definition in the lab, so it is important that they are familiar with them.
  2. Read the introduction and procedures to the students. Model for them the “think aloud” where as you read and come across a term you (or they) may not understand, you go to your flash card.
  3. Give student groups time to perform the experiment.
  4. Summarize class results by having students place the percent concentration of their most concentrated solution right before the precipitate formed. Salt will form about a 25% solution at room temperature. Do a class average.
  5. Have selected students read their conclusions to the class.

Bibliography:
Lesson Design by Jordan School District Teachers and Staff.

Author:
Utah LessonPlans

Created Date :
Dec 18 2014 12:24 PM

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