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chemical formula notes Compound Mixture What kind of one kind of atom Molecule more more than one particles make it than one kind of kind of up? atom compound a shorthand notation that uses chemical symbols and numbers to represent a substance. Pull Element Chemical Formula Each time you see a new capital letter, it means that is a DIFFERENT element. How can it be Can't be broken down? By chemical reaction By physical means Is it the same throughout? yes No yes Examples of chemical formulas: CO2 H2O 2 elements 2 elements Answer C6H12O6 3 elements Answer Answer MgBr2 2 elements Answer lluP Chemical Equation Coefficient the number placed in front of a chemical formula to represent the number of molecules of a certain substance. Pull A symbolic representation of what happens when chemicals come in contact with one another. Subscripts are used to show more than one atom of an element. Pull chemical equation Example: 4CO2 7H2O 4 molecules of carbon dioxide 7 molecules of water C6H12O6 2C6H12O6 2 molecules of glucose Combining coefficients and subscripts to count atoms: 3C6H12O6 Example Pull How many elements do you see in each formula? 6H2O 5CO2 Erase to reveal answers H2O CO2 18 carbon atoms 36 hydrogen atoms 6 carbon atoms 2 hydrogen atoms 1 carbon atom 12 hydrogen atoms 1 oxygen atom 2 oxygen atoms 18 oxygen atoms 72 total atoms 12 hydrogen atoms 6 oxygen atoms 18 total atoms 5 carbon atoms 10 oxygen atoms 15 total atoms 6 oxygen atoms Tap Here Tap Here Tap Here Tap Here Tap Here Tap Here Tap Here 1 Pull Parenthesis subscripts after a parenthesis are applied to all elements inside the parenthesis. Be(HCO3)2 Chemical formula Mg(OH)2 Example: 1 atom of beryllium 1 atom of magnesium 2 atoms of hydrogen 2 atoms of oxygen 2 atoms of carbon 2 atoms of hydrogen 6 atoms of oxygen 5 total atoms 11 total atoms Pull compound up. subscript chemical equation H O H Hydroxide Write the chemical formula for Hydroxide. OH Hydrogen Peroxide O O H O H Write the fomula for 2 molecules of Hydrogen Peroxide. 2H2O2 O H H Ethanol [C2H6O] H C C H H 3 C2H6O H How many atoms of each element are there in 3 molecules of Ethanol? 6 Carbon = ________________ 18 Hydrogen = _______________ 3 Oxygen = ________________ 2