GEMS project

Secret Formulas

Bailey Heick & Gloria Chavez

Description

Concept Map

Elementary Science Methods Home

TITLE OF THE LESSON: Testing More Toothpaste Ingredients

TECHNOLOGY LESSON (circle one): Yes (No)

DATE OF LESSON: November 14, 2008

LENGTH OF LESSON: 50 minutes

NAME OF COURSE: 2nd Grade Science

SOURCE OF THE LESSON: Gems Guide: Secret Formulas Session Six pg 63

TEKS ADDRESSED:
§112.4. Science, Grade 2.b (2) B: Plan and conduct simple descriptive investigations
§112.4. Science, Grade 2.b (2) (E) Construct reasonable explanations and draw conclusions using information and prior knowledge
§112.4. Science, Grade 2.b (2) (F) Communicate explanations about investigations

CONCEPT STATEMENT: Teeth can reenamalize when clean. The best cleaner for teeth is bar soap. Gums can also be disinfected by brushing with any bar soap. Soap washes off in just 2 rinses. Glycerin in all tooth pastes is sticky and may take up to 27 washes to get it off. If too much glycerin is used a film is left on the teeth and they cannot properly reenamalize. The less glycerin in toothpaste the better it is. http://100777.com/health/teethcare

PERFORMANCE OBJECTIVES:

Students will be able to:
* Conduct the investigation to determine which ingredient works best as a cleaner
* Construct explanations why this ingredient is important in toothpaste
* Communicate the outcome of their investigations on different ingredients as cleaners in toothpaste

RESOURCES: For the Class:

1 pair of scissors

1 ceramic tile for teacher demonstration

Paper towels

1 tablespoon of bleach

4 permanent markers (1 yellow, 1 green, 1 blue, 1 orange)

1 small can of blueberries

1 spoon for blueberries

12 tsp of Calcium carbonate

1 to 2 cups Ivory Snow laundry Soap

1 and half cups glycerin

1 and half cups water

For each group of 4 students:

1 cafeteria tray

4 color-dot plastic cups- yellow, green, blue and orange

2 droppers

2 plastic spoons

2 Popsicle sticks

4 ceramic tiles

1 paper cup (for blueberries)

2 cotton swabs

1 sponge (cut into 4 pieces)

SAFETY CONSIDERATIONS: Calcium carbonate, glycerin and soap can be dangerous if ingested. Students will be informed not to swallow the ingredients or taste of them. If this occurs they are to notify the teacher immediately. The bleach used in the demonstration is to only be handled by the teacher and stored in the appropriate spot. The blueberries can stain clothes, so aprons should be used or old t-shirts. The tiles are also breakable so the students should not pick them up.

SUPLEMENTARY MATERIALS, HANDOUTS: Gems Guide Secret Formula Session Six pgs 63-68 for teacher only. This will be needed for exact break down of instructions.

Engagement		Time: __5 minutes______
What the Teacher Will Do	Probing Questions	Student Responses Potential Misconceptions
Remind students of yesterdays experiment.	1) Which ingredient from yesterday do you think will best clean your teeth?	Glycerin, calcium carbonate, water, (soap)
	2) What could we use to test the different ingredients to see which is the best cleaner? 3) What could we use instead of our teeth? 4) How might we use a tile? 5) What are some fruits that stain things?	2/3)Test them in their own mouths (Use a tile stained with blueberries and test each ingredient) 4)Various answers possible (stain the tile then test the cleaners) 5)Numerous answers possible (blueberries)

Exploration		Time: __25 minutes______
What the Teacher Will Do	Probing Questions	Student Responses Potential Misconceptions
Teacher will demonstrate the proper way to stain the tiles with the blueberries. ( See gems guide for proper steps)
Students will then begin to test each ingredient on each of their 4 stained tiles. The colored dot on their tile will indicate which ingredient should be used for that tile.( See gems guide for proper steps)	1) If your tile has a blue dot on it, which ingredient will you use? 2) What if some of the stains don’t come off?	1)(Water) 2) We will then know which ingredient does not clean well

Explanation

Time: ___10_____

What the Teacher Will Do

Probing Questions

Student Responses
Potential Misconceptions

The teacher will have the students report their results to the class and they will be charted on a graph at the front of the classroom.

1) If you want your toothpaste to clean your teeth well, which ingredient would you be sure to put in?

2) What would your toothpaste be like if you only put soap in it?

1)(Soap), calcium carbonate- Students may think calcium carbonate due to its abrasiveness

2)It would taste gross

Elaboration		Time: ____10____
What the Teacher Will Do	Probing Questions	Student Responses Potential Misconceptions
A mixture of calcium carbonate and water will mixed as well as soap with water. Students will be able to taste which one tastes netter and understand why toothpaste is not only made with soap. Students will be told not to swallow the two tests and a small treat will be given to get the taste of soap out of their mouth.		They will think the soap and water is gross.

Evaluation		Time: ____during____
What the Teacher Will Do	Probing Questions	Student Responses Potential Misconceptions
Students will be evaluated throughout the experiment to determine if they conducted the investigation properly to determine which ingredient works best as a cleaner. Construct explanations why this ingredient is important in toothpaste Communicate the outcome of their investigations of different ingredients as cleaners in toothpaste. This will be seen as the graph at the front of the class.	The questions which are asked throughout the experiment are being used as part of the evaluation.	Student responses and misconceptions are stated above.
Students will also be evaluated during the next lesson: Secret formulas of toothpaste, to determine if they put more then just soap and water in their toothpaste.