One of the least expensive is Delta Education Primary Balance (21-inch) Product #WW020-0452 (21-inch). BalanceĪ simple balance is all that is required for the second demonstration. Although the isopropyl alcohol solution is 91% alcohol and 9% water, you can disregard the small amount of water for the purpose of this lesson. If that happens, do not do that demonstration. If you can’t find 91% solution, 70% will work, but your candle might not sink in it. The demonstrations and activity work best with 91% isopropyl alcohol solution, which is available in many grocery stores and pharmacies. Notes about the Materials Isopropyl alcohol Keep it away from any flames or spark sources. When using isopropyl alcohol, read and follow all warnings on the label. Make sure you and your students wear properly fitting goggles. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan. Evaluationĭownload the student activity sheet, and distribute one per student when specified in the activity. Students will be able to determine whether a liquid will sink or float in water by comparing its density to the density of water. They will predict the relative densities of the liquids and then measure their volume and mass to see if their calculations match their observations and predictions. Students will observe three household liquids stacked on each other and conclude that their densities must be different. A liquid will sink if it is more dense than the liquid it is placed in.A liquid will float if it is less dense than the liquid it is placed in.The density of a liquid determines whether it will float on or sink in another liquid.Since density is a characteristic property of a substance, each liquid has its own characteristic density.
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