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Observation: Rocks and minerals often form from molten rock.
Question: How do rocks and minerals form from molten rock?
Hypothesis: Rocks and minerals form during a crystallization process.
Materials: Teacher: 5 hot plates, 5 400 mL beakers, pure cane sugar, table salt, Epsom
salt, Calcium chloride, 5 thermometers, 5 stirring rods.
Materials: Students: White sheet of paper, 3x3 squares of blue, green, orange, red and
black construction paper, 5 aluminum muffin cups, scissors,
magnifying glass.
Procedure:
Prior to the students entering the class, the teacher should have already made super-saturated solutions of all the crystals for this lab.
1. Students should divide into groups of 6.
2. Using a pencil, divide your white sheet into four squares and mark them salt,
sugar, Epsom salt, and CaCl.
3. Cut out a circle of each of the colored squares so the circles would fit in the
bottom of the aluminum cups.
4. Get a small sample of the salt, sugar, Epsom salt, and CaCl and look at them
under the magnifying glass.
5. Draw what each of the crystals looks like on your white sheet and in the
appropriate box.
6. The teacher will call out various substances and the color of the cup the
students should bring up.
7. Students will receive enough of the solution to cover the bottom of their cups.
8. Students should place their white piece of paper on an assigned table and their cups in the appropriate squares.
The mixture cup should be placed in the middle of the white sheet.
9. Students should examine their crystals throughout the week.
10. At then end of one week’s time, students should draw the new crystals and
compare the two drawings. They should also see if they could distinguish
between the various substances within the mixture cup.
Data:
See attached sheet.
Analyzing Data:
Conclusion:
Error analysis/Future question:
| Crystal Formation Lab | |
| Hr | Group Name |
| Salt | Sugar |
| Epsom Salt | CaCl |