Warm-up <ul><li>1.  Draw Bohr’s Model for each of the following: </li></ul><ul><li>a. Mg    b. P  c. O d. Ar </li></ul>
5-1 Describing Reactions <ul><li>Objectives: </li></ul><ul><ul><li>Interpret  chemical equations in terms of reactants, pr...
Chemical Reactions <ul><li>Chemical reactions are combinations of elements or compound(s) that combine to produce new comp...
Chemical Equations <ul><li>Reactions can be written in short hand. </li></ul><ul><li>Reactants    Products </li></ul><ul>...
Conservation of Mass <ul><li>Mass cannot be created or destroyed.  </li></ul><ul><li>Mass can be transferred from one type...
Conservation of Mass
Counting Atoms <ul><li>H 2 O </li></ul><ul><ul><li>H – 2 </li></ul></ul><ul><ul><li>O – 1 </li></ul></ul><ul><li>CO 2 </li...
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5-1 Describing Reactions

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5-1 Describing Reactions

  1. 1. Warm-up <ul><li>1. Draw Bohr’s Model for each of the following: </li></ul><ul><li>a. Mg b. P c. O d. Ar </li></ul>
  2. 2. 5-1 Describing Reactions <ul><li>Objectives: </li></ul><ul><ul><li>Interpret chemical equations in terms of reactants, products and conservation of mass. </li></ul></ul><ul><ul><li>Balance chemical equations by manipulating coefficients. </li></ul></ul>
  3. 3. Chemical Reactions <ul><li>Chemical reactions are combinations of elements or compound(s) that combine to produce new compound(s). </li></ul><ul><li>In reactions, chemicals change to become other chemicals. </li></ul><ul><li>Reactants </li></ul><ul><ul><li>Substances that change </li></ul></ul><ul><li>Products </li></ul><ul><ul><li>New substances created </li></ul></ul><ul><li>Coal(carbon) burns in the presence of oxygen to produce carbon dioxide gas </li></ul>
  4. 4. Chemical Equations <ul><li>Reactions can be written in short hand. </li></ul><ul><li>Reactants  Products </li></ul><ul><li>Carbon + Oxygen  Carbon dioxide </li></ul><ul><li>C + O 2  CO 2 </li></ul><ul><li>Chemical reactions can be written in sentence or equation form. </li></ul>
  5. 5. Conservation of Mass <ul><li>Mass cannot be created or destroyed. </li></ul><ul><li>Mass can be transferred from one type of matter to another. </li></ul><ul><li>In a chemical reaction the mass before must equal the mass after the reaction. </li></ul><ul><li>The mass of the reactants must equal the mass of the products. </li></ul>
  6. 6. Conservation of Mass
  7. 7. Counting Atoms <ul><li>H 2 O </li></ul><ul><ul><li>H – 2 </li></ul></ul><ul><ul><li>O – 1 </li></ul></ul><ul><li>CO 2 </li></ul><ul><ul><li>C – 1 </li></ul></ul><ul><ul><li>O – 2 </li></ul></ul><ul><li>Pb(CO 3 ) 2 </li></ul><ul><ul><li>Pb – 1 </li></ul></ul><ul><ul><li>C – 1 x 2 = 2 </li></ul></ul><ul><ul><li>O – 3 x 2 = 6 </li></ul></ul><ul><li>4 Ga 2 (SO 4 ) 3 </li></ul><ul><ul><li>Ga – 2 x 4 = 8 </li></ul></ul><ul><ul><li>S – 1 x 3 x 4 = 12 </li></ul></ul><ul><ul><li>O – 4 x 3 x 4 = 48 </li></ul></ul><ul><li>Subscripts apply only to the the atom directly before it. </li></ul><ul><li>Subscripts out side parenthesis distribute inside. </li></ul><ul><li>Coefficients distribute to both. </li></ul>

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