Balancing Equations

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# Balancing Equations - PowerPoint PPT Presentation

Balancing Equations. Alabama Course of Study. 4.) State the law of conservation of matter. 4.1Balancing chemical equations by adjusting coefficients. Chemical Equations.

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### Balancing Equations

Alabama Course of Study
• 4.) State the law of conservation of matter.
• 4.1Balancing chemical equations by adjusting coefficients
Chemical Equations
• Chemical Equation- representation of a chemical reaction that uses symbols to show the relationship between the reactants and products
• Reactants- what is put into a reaction
• Product- what forms after a reaction occurs
An example
• C +o2 =co2
• Reactants Product
Law of Conservation of Mass
• Law of mass of energy- Mass is neither created nor destroyed and both sides of the equation must be equal
How many atoms are in each Compound?
• H2CO3 =___H ___C ___O
• H20 = ___ H ___0
• HCl = ___H ___ Cl
• ZnCl2 = ___Zn ___Cl
• AgNO3 =___ Ag ___N ___O
• FeCl2 = ___Fe ___Cl
How many atoms are in each Compound?
• 2H2CO3 =___H ___C ___O
• 3H20 = ___ H ___0
• 4HCl = ___H ___ Cl
• 2ZnCl2 = ___Zn ___Cl
• 3AgNO3 =___ Ag ___N ___O
• 4FeCl2 = ___Fe ___Cl
Rules to balancing equations
• Rule 1- the superscript or the two inco2 cannot be changed
• Rule 2- You can add a coefficient or the three in 3co2
• Rule 3- the atoms on both sides must be equal
More problems
• Na + Cl2 = NaCl
• Mg + N2 = Mg3N2
• 2KI + Cl2 = KCl + I2
• FeS +HCl = FeCl2 + H2S
• Na + O2 = Na20
• Ag3N = Ag + N
• P4 + O2 = P2O5
Different kinds of chemical reactions
• Synthesis reaction- two or more substances form to make one new compound
• 2Na + Cl2 = 2NaCl
• 1 + 2 = 3
• C + 02 = C02
Decomposition
• Decomposition- single compound is broken down into two or more compounds
• H2CO3 = H20 + C02
• 3 = 1 + 2
Single Displacement Reactions
• Single displacement- one element takes the place of another element
• Zn + 2HCl = ZnCl2 + H2
• 1 + 2x3 = 1x3 + 2
Double-displacement
• Double- displacement- two substances change places with each other
• NaCl + AgF = NaF + AgCl
• 1 X2 + 3X4 = 1X4 + 3 X 2