# Chemical Equations Chapter 11 J. Snider. Chemical Equations What is a chemical equation? How do you balance a chemical equation? How do you identify the.

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Chemical Equations Chapter 11 J. Snider

Chemical Equations What is a chemical equation? How do you balance a chemical equation? How do you identify the type of chemical equation?

Chemical Equations Is written as an _________________ similar to a __________________ equation that can be compared to a _________________ that a chemist follows in order to ___________________ desired results.

Chemical Equations All chemical reactions have ______________ and __________________. We express a chemical equation as follows:  reactants  products  The arrow is equivalent to an “__________“  When we describe the equation we use the word “___________” or “____________” instead of equals.

Conservation of Matter The law tells us that matter can neither be ________________ nor ______________. It is transformed from one form to another. We follow the law when we ______________ equations.

Balancing a Chemical Equation When ions or atoms found on the ___________side of the equation _________ that found on the __________ side. The _____________ can be considered the balance point.

Coefficients We use ______________ in front of elements or compounds on either side of the reaction to balance the equation.  The coefficient go IN _____________ OF the chemical!!! We can NOT change __________________ because it would create new materials that is not part of the reaction process.

Balance this equation Na + Cl 2 → NaCl

Balancing Equation Practice CuCl 3 + Li 2 S → Cu 2 S 3 + LiCl NiNO 3 + KCl → NiCl + KNO 3 FeCl 3 + Na 2 O → Fe 2 O 3 + NaCl

Identifying Reaction Types Reactions are classified by their ________________ There are 5 basic types of chemical reactions:  Synthesis or ____________________  ________________________  ________________ replacement  _________________________

Synthesis or Combination A + B → C Note: ____________ product! This is your clue that this is synthesis or combination.

Decomposition Reaction AB → A + B Note: Single _______________!!!!

Single Replacement Reaction A + CD → AD + C Note: Element A ________________ ion C in the reaction. The clue in this reaction is:  Element + compound → Element + compound

Double Replacement Reactions AB + CD → AD + CB Notice _________ ion from compound AB replaces _________ ion from compound CD

Combustion Reactions Complete:  O 2 is a reactant and ___________ + __________ is produced Example:  CH 4 + O 2 → CO 2 + H 2 O

Combustion Reactions Incomplete: _______________ is formed Example:  CH 4 +O 2 → CO + H 2 O

Completing Reactions 1 st step: ______________ reaction type 2 nd step: ___________ the net ionic equation 3 rd step: _______________ the reaction taking care to write each formula correctly. (criss- cross method) Example: Al + O 2 →

Completion Practice Na + K 2 SO 4 → PbSO 4 + LiCl → Ca + H 2 O →

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