Janice VanCleave's A+ Projects in Chemistry: Winning by Janice VanCleave

By Janice VanCleave

Developing clouds in a soda bottle to review climate is one of the 30 attention-grabbing experiments present in this engrossing and informative e-book. exhibits readers tips to devise and bring hard technology experiments with out utilizing advanced and costly gear. as soon as a venture is finished, readers are inspired to enquire additional, create extra experiments and strengthen their very own theories and conclusions. for kids a long time 12 and up.

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Science Fair Hint: Display colored diagrams to represent the results of the addition of iodine to saturated and unsaturated oils. 2. How does iodine affect the degree of unsaturation of different oils? 1 of iodine one at a time. Wait until the oil clears before adding the next drop. Continue to add the iodine until the color does not clear. To speed up the process, use a smaller container of oil such as a test tube. Science Fair Hint: Construct and display a bar graph comparing the number of iodine drops added to each sample of oil.

These macromolecules often contain thousands of amino acids. The long protein molecules in the gelatin dissolve in hot water and form a colloidal mixture (solution with large solute molecules suspended throughout). The gelatin (protein) molecules are forced apart and are surrounded by water molecules. As the solution cools, chemical bonds form between the protein molecules. The bonds between the protein molecules produce a lattice network in which water molecules in the solution become trapped; thus, the solution "gels" into a firm, jellylike substance.

20. Calculate the temperature change per unit of time by dividing the temperature change by the burning time. 21. Construct a data table such as the one shown here. 7°C) per minute. Why? Burning is a process by which oxygen combines with a substance and energy (ability to do work) is released. html 27/09/2003 Document Página 1 de 1 Page 34 duces heat (a form of energy), which is indicated by the warming of the water. Animals are dependent upon internally generated heat, which is produced by a much slower ''burning" process called respiration.

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