Lesson Plan Industry Sector
Health Science and Medical Technology

## Solutions, Measurements and Data Analysis - Olson

### Lesson Plan Overview / Details

This activity works well in the first part of the year to help re-acquaint students with volumetric measurements, making solutions and data analysis. You will need the following materials for the lab; large volumetric flasks, 100 ml or 250 ml beakers, metric ruler, molasses, new/fresh yeast, lots of large test tubes and smaller test tubes that will be inverted and placed into the larger test tubes to collect CO2

This lab can be used in a variety of units: cellular respiration & fermentation, microorganisms, carbohydrate metabolism, scientific method and measurement.

2 classes
55 Minutes

### Objectives and Goals

• Students will be able to create solutions with specific percentages or molarities.
• Students will understand and demonstrate metric measurements, data collection and analysis

### Activities in this Lesson

• This lab can be altered to illustrate a variety of different topics; cellular respiration, fermentation, measurements, microorganisms, solutions and dilutions.  It is presently written as a review to solutions and measurements.

As students walk into class there will be a collection of solutions in beakers.  The solutions can be anything from; coffee, soda, water, Kool-aid, tea or just water and food coloring.  The question on the board reads, " Which one of these solution contains the most sugar?"  The discussion will most likely lead to tasting the solutions.  However, any teacher worth their salt knows that you never taste solutions in the lab. So the follow up question is," How can we prove which solution has the most sugar in it?"  Allow the students to discuss this question at their tables for a moment and then share any ideas.

Once everyone has had a chance to share, introduce the lab.  In the discussions make sure to address concepts key to the lab; scientific method, measurements and cellular respiration

• Lab Demo - Demo / Modeling

Teachers will need to create a yeast solution the night before from a new/fresh packet of yeast and warm water.   To make the yeast solution ,add 1 gram of Active Dry Yeast to approximately 500 ml of warm water the night before.

Teachers will want to demo how to make solutions and how to make the remaining dilutions.  The instructions are on the lab write-up.  This you (the instructor)  will want to practice, especially  removing ALL of the air from the small test at the beginning of the experiment.

• Molasses Lab - Lab / Shop

This lab will take at least 2 days.  The first day will include making the molasses solutions.  Depending on the focus of the lab, you can approach the making of solutions by percentages or molarity.  Regardless, it is a great way to get the students thinking about solutions and dilutions.  Once the dilutions are made and the smaller test tubes have been place inverted into the larger test tubes, place the test tubes in a test tube rack and wait at least 24 hrs and maybe 48 hours for results.

The following day or two, students will measure the length of the CO2 gas bubble trapped in the smaller test tubes using a metric ruler.  Students will need to create a graph to compare gas production vs molasses concentration.

• Molasses Lab [ Download ] This is the lab write-up. The lab is fairly self explainitory
• Lab Graph - Assessment

The following day or two, students will measure the length of the CO2 gas bubble trapped in the smaller test tubes using a metric ruler.   Students will need to create a graph to compare gas production vs molasses concentration.

Attached is a sample graph.  Depending on the class or unit focus you can also address statistics, standard deviations, averages, out liners, experimental controls, and the list could go on.  The main focus is to focus on procedure and measurement.

• Example Molasses Graph [ Download ] Attached is an example of what the graph may look like. Some prior knowledge of Excel will be helpful

### Assessment

Assessment Types:
Writing Samples, Observations,

As students are working on the lab, I will be walking around asking questions to assess how they are doing.

Students will also submit their lab write-ups, questions and graphs for a lab grade.  Although the data will vary, there should be a clear pattern in the data.