Chemical Equations.

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Presentation transcript:

Chemical Equations

Lesson Outline Types of chemical equations Building block activity Balanced chemical equations Chemical equations worksheet

Specific Expectations C2.2 Write balanced chemical equations to using the IUPAC nomenclature system. V3.1 Do not put any of the building blocks in your mouth during the building block activity, and ensure that all are placed back in their original location upon completion.

Types of chemical equations Word Equations: identify reactants and products by name Ex. sodium + chlorine  sodium chloride reactants Products

Types of chemical equations Skeleton equations: identify reactants and products by chemical formula, and physical state. Ex. Na(s) + Cl2(g)  NaCl(s)

The law of conservation of mass! States that in any chemical reaction, the mass of the products is always equal to the mass of the reactants (there must be the same amount of each atom on either side of the equation)

Balanced chemical equations Reflects the law of conservation of mass and shows the same amount of each kind of atom on both sides of the equation! Ex. Unbalanced Na(s) + Cl2(g)  NaCl(s) Balanced 2 Na(s) + Cl2(g)  2 NaCl(s) Coefficients

Steps to balancing chemical equations Step 1: Count the number of atoms on both sides of the equation. Step 2. Add coefficient's in front of reactants and products until there is the same number of each atom on both sides of the equation. (a) balance the atoms that occur in the largest number on either side of the equation. (b) balance oxygen and hydrogen atoms last. Step 3: Recount each atom in the equation to ensure it is balanced. Ex. P4(s) + O2(g)  P4O10(s) SO2(g) + O2(g)  SO3(g) Cu(NO3)2 (aq) + KOH(aq)  Cu(OH)2(s) + KNO3 (aq) .