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Chemical Equations. Objectives: 1. Explain how a chemical equation describes what happens in a chemical reaction. 2. Explain how a balanced chemical equation illustrates the law of conservation of matter. Key Terms: Chemical equation, Balanced chemical equation, Coefficient.

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chemical equations
Chemical Equations

Objectives:

  • 1. Explain how a chemical equation describes what happens in a chemical reaction.
  • 2. Explain how a balanced chemical equation illustrates the law of conservation of matter.

Key Terms:

  • Chemical equation, Balanced chemical equation, Coefficient
chemical equations1
Chemical Equations
  • A chemical equation is the shorthand used by chemists to describe a chemical reaction. Just as in math the equation matches the number and type of reactants with the products.
chemical equations2
Chemical Equations
  • The types and numbers of atoms in the reactants must match the type and numbers of atoms in the products.
    • Must follow the Laws of Conservation of Mass, Matter, & Energy
  • When the atoms in the reactants match the products the equation is said to be balanced.
    • to balance an equation you may only change the coefficient
    • A chemical equation that is balanced for charge using subscripts but does not have coefficients is called a skeleton equation
balancing chemical equations
Balancing Chemical Equations

1. AgNO3+ H2S g Ag2S + HNO3

2. Zn(OH)2 + H3PO4gZn3(PO4)2 + H2O

3. hydrogen + sulfur yields hydrogen sulfide (hint: Remember your diatomic molecules)

4. iron (III) chloride + calcium hydroxide yields iron (III) hydroxide + calcium chloride

  • Balance the top equations by only changing the coefficients

1. 2AgNO3 + H2S gAg2S + 2HNO3

2. 3Zn(OH)2 + 2H3PO4gZn3(PO4)2 + 6H2O

3. H2 + S gH2S

4. 2FeCl3 + 3Ca(OH)2g2Fe(OH)3 + 3CaCl2

  • When you count the number and types of atoms on each side of the equation they should match
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