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Balanced Chemical Equations. Conservation of Matter Matter can neither be created nor destroyed by any physical or chemical change. Atoms that start a.

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Presentation on theme: "Balanced Chemical Equations. Conservation of Matter Matter can neither be created nor destroyed by any physical or chemical change. Atoms that start a."— Presentation transcript:

1 Balanced Chemical Equations

2 Conservation of Matter Matter can neither be created nor destroyed by any physical or chemical change. Atoms that start a reaction must still be present at the end of the reaction.

3 Chemical Equations Chemical equations show which substances appear at the beginning and end of a reaction and how many of each of them are present.

4 Chemical Notation Recall that coefficients multiply an entire species and subscripts multiply a specific element in a compound.

5 Chemical Notation Symbo l Meaning+ separates multiple reactants or products → separates reactants from products (s) indicates solid state (l) indicates liquid state (g) indicates gaseous state (aq) indicates species in water solution

6 Balancing Equations 1) Write the substances you start with (reactants) to the left and the substances you end with (products) to the right of the arrow. Example: Solid aluminum and chlorine gas combine to form solid aluminum chloride at 298K.

7 Balancing Equations 2) Separate reactants and products with a line, then write the count of each atom below each compound. Example: Solid aluminum and chlorine gas combine to form solid aluminum chloride at 298K. Al = 1 Cl = 2 Al = 1 Cl = 3

8 Balancing Equations 3) Compare each atom on each side. If not equal, add coefficients. Example: Solid aluminum and chlorine gas combine to form solid aluminum chloride at 298K. Al = 1 Cl = 2 Al = 1 Cl = 3 26 62


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