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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.

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Chemical Equations

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  1. 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

  2. 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.

  3. 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

  4. 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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