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Conservation of Mass and Chemical Equations

Conservation of Mass and Chemical Equations. Conservation of Mass. A chemical change always involves the conversion of substances called reactants into other substances called products . A chemical reaction is a process where new substances are formed.

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Conservation of Mass and Chemical Equations

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  1. Conservation of Mass and Chemical Equations

  2. Conservation of Mass A chemical change always involves the conversion of substances called reactants into other substances called products. A chemical reaction is a process where new substances are formed. Law of Conservation of Mass:In a chemical reaction, the total mass of the products is the same as the total mass of the reactants.

  3. Writing Chemical Equations Used to represent a chemical reaction. Word equation: Hydrogen + oxygen --> water Skeleton Equation: H2 + O2 H2O Balanced Equation: 2H2 + O2 2H2O The coefficient “2” is placed in front to show how many units of the substance are involved in the reaction.

  4. Showing the State of a Substance The states of the reactants and products should be included in a completed chemical formula. Solid (s), liquid (l), gas (g), aqueous solution (aq)‏ EG Ca(OH)2(aq) + Na2OH (aq)  CaCO3(s) + 2 NaOH(aq)‏

  5. Balancing Chemical Equations: You can only change the coefficient number!!! Step 1: check to see if you have the same number of atoms on each side of the arrow by making a chart and listing the different atoms. Step 2: add a coeffient for each atom to either end of the arrow Step 3: check to see if it balanced again.

  6. Tips: Balance compounds first, elements last. Balance H and O last because they usually appear most often. Try p. 164 #1-4 P. 165 #1 P. 168 #1-3, 7-8.

  7. Done with Chapter 4! 4.1 Ionic Compounds What are ionic compounds? Naming binary compounds Multivalent ionic compounds (roman numerals)‏ Polyatomic ions 4.2 Molecular compounds What are molecular compounds? Prefixes and chem formula 4.3 Conservation of Mass and Chem Equations The law of conservation of mass Chem reactions (3 types)‏ Balancing equations P.174 #1-13

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