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20 Cards in this Set
- Front
- Back
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What are the two types of chemical bonds we learned about?
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Ionic and Covalent
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Define a molecule.
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A neutral particle made of two or more atoms joined by covalent bonds.
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Define a compound.
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A pure substance made of two or more elements chemically combined.
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Most commonly, are the properties of a compound, the same or different than the individual elements that made them?
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Different
(or unique) |
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Define a polymer.
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A large molecule in which many smaller molecules are bonded together.
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Define the crystal structure of NaCl.
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Little +Na's attracted to larger Cl-'s in an alternating pattern, giving it a specific three dimensional shape called a crystal. (pg. 188)
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Define the term "products" in a chemical reaction.
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A substance formed as a result of a chemical reaction.
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Define the term "reactants" in a chemical reaction.
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A substance that undergoes change in a chemical reaction.
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What law explains that atoms aren't created or destroyed, simply rearranged when a chemical reaction occurs?
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The Law of Conservation of Mass.
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Why do we balance chemical reactions?
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To prove or demonstrate the Law of Conservation of Mass.
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Define exothermic.
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A reaction that releases energy in the form of heat.
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Define endothermic.
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A reaction that absorbs energy in the form of heat.
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What happens to energy in a chemical reaction?
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It is absorbed or released.
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Describe the pH scale.
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Values from 0-14. 7 represents water, which is neutral. Acids have a pH from 0-6.99 and bases have a pH of 7.01 to 14.
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What does the pH scale represent?
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The number of Hydrogen ions in solution.
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Why is Carbon so special?
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Because it has 4 bonds allowing it to bond with itself repeatedly.
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What does CHNOPS stand for and what does each letter represent?
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C=Carbon H=Hydrogen N=Nitrogen O=Oxygen P=Phosphorus S=Sulfur These are the 6 main elements found in most living organisms.
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List 4 large molecules found in living organisms?
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Carbohydrates, fats, proteins and DNA.
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List 2 small molecules found in living organisms?
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H2O and salt.
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What element is found in all living organisms?
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Carbon
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