By Virginia L. Mullin

Childrens can notice very important rules of recent technological know-how by means of engaging in those intriguing experiments. applicable for grade schoolers and youths, this illustrated quantity explains the language of chemistry and lab strategies. greater than forty experiments comprise turning out to be a crystal backyard, production oxygen, making a miniature volcano, making cleaning soap and toothpaste, and extra.

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You've probably heard this or similar statements before. But what do you know about the gases the air is made of? First, the combination of gases in the air forms a mixture. Like a compound, a mixture contains two or more different substances. But in a mixture the substances are not combined chemically. The proportions of different substances in a mixture may vary from place to place and from time to time; they can also be separated from each other more easily than the different substances in a compound.

46 When two or more liquids form a true solution, they take up less space in solution than they would separately. Two pints equal I quart-but not if one is water and the other alcohol. When one liquid dissolves in another, the molecules of the solute occupy the empty spaces between the molecules of the solvent. In a liquid the molecules are fairly far apart. Thus the solution is denser than either substance separately and has less volume than the total volume of the solute and solvent separately.

When crystals absorb water from the air, the process is called deliquescence. The following experiments will show you the effects of efflorescence and deliquescence. HOW YOU CAN DETECT WATER OF HYDRATION Gather these materials: Copper sulfate crystals (CUS04); sodium carbonate crystals (Na 2CO a) ; 2 test tubes; an alcohol burner; a few drops of water; and paper and pencil. Follow this procedure: Write down a description of the appearance of each S6 of the two types of crystal. Put a small quantity of each into separate test tubes.

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Chemistry Experiments for Children by Virginia L. Mullin


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