By Cynthia Light Brown, Blair Shedd
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Extra info for Amazing Kitchen Chemistry Projects You Can Build Yourself
RNKTSD the dissolved substance in a solution. ZNgV[T
=_\WRPa` #QXRS@KR Crystals are a special form of solid, where the atoms are arranged in an orderly pattern. If you think of an entire crystal as a building, then the building blocks would be molecules. These building blocks are stacked up like bricks. If conditions are right, the building blocks keep stacking up over and over into a crystal big enough to see. If you could shrink down to the size of an atom, you would see the regular arrangement of the atoms.
Look at the periodic table of elements. Use the caption to ﬁgure out how to read the chart. Hydrogen, with a symbol of H, is number one in the upper lefthand corner. It has one proton and one electron, and it’s in Group 1. ) Elements in Group 1 have an electron sitting out all by itself in the outermost shell, which isn’t stable. These atoms easily give up that electron, leaving a stable shell underneath, or they share it with another atom. Now look on the right side of the periodic table at oxygen, with a symbol of O and an atomic number of eight.
Calcium carbonate is a base, and its chemical symbol is CaCO3. Vinegar contains water and acetic acid, which gives vinegar its sour taste. Acetic acid has a chemical formula of CH3COOH. All acids have one or more hydrogen atoms (H) because an acid is a hydrogen ion donor. When the vinegar and eggshell come into contact, they react and neutralize each other. The vinegar dissolves the shell, but did the shell actually disappear? No. The calcium carbonate molecules that make up the shell break up in the reaction and form new molecules, or products.