Learning Experience 8: Some More Minerals in Use

TEACHER’S GUIDE

Materials:

For each group of three students:

3 Student Activity Sheets for Learning Experience 8

Antacid tablet

Petri dish

Dropper bottle of hydrochloric acid

Double lens magnifier

3 pairs of safety goggles

Medicine cup

Paper towels

White copy paper

For the class:

4 mortar and pestles

Jar halite (salt)

Scissors

Metric rulers

Preparation:

Read the background information in the Rocks, Minerals, and Landforms Teacher’s Manual. (Please see PDF) You will need four mortar and pestles for the class.

Session 1:

Each group of students will use the mortar and pestle to grind an antacid tablet for testing. It should take about 10 seconds to grind the tablet completely. Students are to perform an acid test on the antacid to test for carbonates or limestone in a petri dish.

Session 2:

Students should measure about 5 cc of halite (salt) into the mortar and pestle. Students should grind the halite until it is a fine powder. It should take about 60 seconds to grind the halite.

Vocabulary:

mortar and pestle

grind

Objective: Students will test and process some minerals found in some common household products.

What can we find out about minerals used in some common household products?

The following learning experience provides students with opportunities to observe the effect of some of the minerals found in common household products. Provide students the Student Activity Sheet for Learning Experience 8.

Session 1

Direct the students to read complete the Student Activity Sheet for Session 1.

Students should observe changes in properties of the antacid. Students should perform a hydrochloric acid test on the antacid and record their observations.

Discussion Questions:

What happened when the antacid was tested with the hydrochloric acid?

Where have you seen that effect before?

What type of sand exhibited the same reaction?

Session 2

Direct the students to read and complete the Student Activity Sheet for Session 2.

Students should observe changes in properties of the halite (salt). Student should perform a hydrochloric acid test on the halite (salt) and record their observations.


STUDENT ACTIVITY SHEET for Learning Experience 8

Name_________________


SOME MORE MINERALS IN USE

Note: Students must use goggles when using hydrochloric acid.


Session 1

Place one antacid in the mortar. Observe the antacid with the double lens magnifier. Use the pestle to grind the antacid into a powder. Use a rotating motion, the grinding should take about 10 seconds. Trace the petri dish on a piece of white copy paper. Then cut out the circle approximately 3 mm. inside the line so the paper circle will fit into the bottom of the petri dish. Place 5 cc of the powder in a petri dish. Observe the powder with the double lens magnifier. Add 2 to 3 drops of hydrochloric acid to the antacid and observe the results.


What changes did you observe?

________________________________________________________________

________________________________________________________________


What effect did the acid have?

________________________________________________________________

________________________________________________________________


What do you think that the acid test indicates about the antacids?

________________________________________________________________

________________________________________________________________


Session 2

Place about 5 cc of halite into the mortar. Observe the halite with the double lens magnifier. Use the pestle to grind the antacid into a powder. Use a rotating motion, the grinding should take about 60 seconds. Place 5 cc of the powder in a petri dish. Observe the powder with the double lens magnifier. Add 2 to 3 drops of hydrochloric acid to the halite and observe the results.


What changes did you observe?

________________________________________________________________

________________________________________________________________


What effect did the acid have?

________________________________________________________________

________________________________________________________________


What do you think that the acid test indicates about the halite?

________________________________________________________________

________________________________________________________________

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