TOPIC: Structure of Matter
Students will evaluate the particulate nature of matter.
Demonstrate the role of motion in the particulate description of matter.
Intended Learning Outcomes:
1a. Make observations and measurements.
Be familiar with the particulate nature of matter.
1. Students will form hypotheses and observe demonstrations of particle movement.
2. Students will identify variables and describe relationships
in simulations of particle movement.
Place a few drops of milk on a microscope slide. Add
a cover slip. Observe the fat globules on medium power of a microscope.
Pick a fat globule and stare. What does the motion of the fat globules
in two-percent milk look like? What could be causing the globules
to vibrate? (This motion is called Brownian motion. The fat globules
move because of the motion of the molecules in the milk.)
How does the temperature of water affect the motion of the food coloring in the water?
Predict what you think will happen.
Design a Test of your hypothesis:
Analyze Results: Make a bar graph that shows the time it took for each of the three temperatures of water to form a solution of water and food coloring.
Conclusion: Compare your hypothesis with what you observed.
Extension: Try changing other variables like the amount of stirring or water with different substances like salt or sugar dissolved in the water before adding the food coloring.
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State 7th Grade Integrated Science Core Curriculum Page.
Updated June 14, 2000 by: Glen Westbroek
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