By Robert Gardner

ISBN-10: 1464504989

ISBN-13: 9781464504983

Solids, beverages, and gases–oh my! research all concerning the states of subject and primary actual ideas with the thrill technological know-how experiments during this booklet. discover in case you could make water circulation upward, if carbon dioxide is heavier than air, and extra! Many experiments comprise principles scholars can use for his or her technological know-how reasonable.

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How does it appear? Place a wax candle halfway into the water. What does the surface of the water look like where it meets the candle? As shown in Figure 12, the water surface curves upward where it meets the glass. Where its surface contacts the candle, the water curves downward. What is the cause of this difference? Whether a liquid surface curves up or down on contact with a solid depends upon which is stronger, cohesion within the liquid or adhesion between the liquid and a solid. If adhesion is stronger, it pulls the liquid surface upward until the adhesion-cohesion forces are balanced.

Try the same thing with water. Draw about half a cylinderful of water into the syringe. Place your finger tightly against the open end of the cylinder and try to push the plunger inward. Can you compress a liquid? FIGURE 1: a) Pull the plunger of a syringe outward to draw air into the cylinder. b) Put your finger firmly over the open end of the syringe and push the plunger inward. Can you squeeze air into a much smaller volume? Do you think you can compress something that seems solid? To find out, fill the cylinder of a plastic syringe with dry sand.

What is the solubility of salt in hot water? ) What is the solubility of Epsom salts in hot water? Of sugar in hot water? Does temperature affect solubility? For which of the solutes you tested was solubility affected most by temperature? FIGURE 9: This graphs shows the solubility of four different salts at various temperatures. KNO3 = potassium nitrate NaCl = sodium chloride KBr = potassium bromide Ce2(SO4)3 • 9H2O = cerium sulfate hydrate Science Fair Project Ideas Design an experiment to find the temperature at which water and saturated solutions of salt and Epsom salts freeze.

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Ace Your Physical Science Project by Robert Gardner


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