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Published byDominick Gibson Modified over 9 years ago
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Chemical Formulas & Equations
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Molecule A combination of two or more atoms bonded together.
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Compound A substance made of two or more different elements that are chemically combined. Involves the sharing, stealing, or giving up of valence electrons H 2 O Water is a compound
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Subscript A number in a chemical formula that shows how many atoms of each element are present. Example: The “two” in H 2 O
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Coefficient A number in front of a chemical formula showing how many molecules or atoms are present. Example: The “three” in 3H 2 O The “two” in 2Fe
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Chemical Formula A combination of symbols and numbers that show how many atoms of each element are present in a molecule Example: H 2 SO 4 One molecule of sulfuric acid has two atoms of hydrogen, one atom of sulfur, and 4 atoms of oxygen
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Chemical Equation An easy way to show a chemical reaction using symbols instead of words. 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 It reads like this…….. 6 molecules of carbon dioxide react with 6 molecules of water to yield 1 molecule of glucose and 6 molecules of oxygen
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Reactants A substance present at the start of a chemical reaction Products Substance that is formed as the result of a chemical reaction 6CO 2 + 6H 2 O C 6 H 12 O 6 + 6O 2 ReactantsProducts *The red arrow means “Yields”
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The Law of Conservation of Mass Matter can not be created or destroyed. Chemical equations must be balanced. This is done by changing the coefficients (not the subscripts!) Not balanced: H 2 + O 2 H 2 O Balanced: 2H 2 + O 2 2H 2 O
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