By Robert Gardner
E-book by means of Gardner, Robert, Conklin, Barbara Gardner
Read Online or Download Chemistry Science Fair Projects Using French Fries, Gumdrops, Soap, and Other Organic Stuff (Chemistry! Best Science Projects) PDF
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Booklet through Gardner, Robert, Conklin, Barbara Gardner
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Extra resources for Chemistry Science Fair Projects Using French Fries, Gumdrops, Soap, and Other Organic Stuff (Chemistry! Best Science Projects)
As a result, the oxygen end of 50 Polar and Nonpolar Compounds a) b) hydrogen bond Figure 11. a) In water molecules, hydrogen atoms bond to oxygen at an angle of 105 degrees. b) The polar molecules of water are attracted to one another through weak hydrogen bonds. the molecule is slightly negative, while the hydrogen end has a slight positive charge. We say that the molecule is polar. Because water molecules are polar, the hydrogen (+) end of the molecule is attracted to the oxygen (−) end of other water molecules.
Because water molecules are polar, the hydrogen (+) end of the molecule is attracted to the oxygen (−) end of other water molecules. As illustrated in Figure 11b, these attractive forces create weak bonds, called hydrogen bonds, between water molecules. 1 Polar and Nonpolar Compounds Materials ✓ plastic comb ✓ propanol, methanol, or ✓ paper towel or ✓ ✓ ✓ ✓ ✓ ✓ ✓ wool cloth water faucet cooking oil sink finishing nail Styrofoam cups a partner rubbing alcohol ✓ ✓ ✓ ✓ ✓ ✓ ✓ ethanol (optional) dinner fork paper clip bowl plastic vial or small glass eyedroppers waxed paper toothpicks You can demonstrate the polar nature of water molecules quite easily.
Write the equation on a separate sheet of paper. vinegar + baking soda CH3COO− + H+ + Na+ + HCO3− → Na+ + CH3COO− + ? + ? After you complete the equation, there should be as many atoms of each element on the right side of the arrow as there are on the left. Are there? 3 Polarity, Solubility, and Density Materials ✓ teaspoon ✓ small, tall jar with ✓ salt (NaCl) ✓ water ✓ ✓ small glass ✓ ✓ cooking oil ✓ ✓ balance for weighing ✓ ✓ 100-mL graduated ✓ cylinder ✓ rubbing alcohol ✓ methanol ✓ ethanol ✓ ✓ ✓ a screw-on cap vinegar an egg table knife cereal bowl sugar citric acid detergent mucilage (plant gum) If a solid dissolves (disappears) when mixed with a liquid, we say the solid is soluble in the liquid.