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Balancing Chemical Equations Worksheet Answer

Balancing chemical equations is the process of ensuring that the number of atoms of each element on the reactant side of a chemical equation is equal to the number of atoms of that element on the product side. This is necessary because the law of conservation of mass states that matter cannot be created or destroyed, so the total number of atoms must remain the same during a chemical reaction.

To balance a chemical equation, you can add coefficients (numbers in front of atoms or molecules) to the reactants and/or products as needed. The coefficients should be chosen such that the number of atoms of each element on both sides of the equation is equal.

Here is an example of a balanced chemical equation:

2H2 + O2 -> 2H2O

In this equation, the number of hydrogen atoms on the reactant side (2) is equal to the number of hydrogen atoms on the product side (2), and the number of oxygen atoms on the reactant side (1) is equal to the number of oxygen atoms on the product side (1). Therefore, this equation is balanced.

Balancing chemical equations is an important skill in chemistry as it helps to accurately represent the changes that occur during a chemical reaction. It is also necessary for calculating the amounts of reactants and products involved in a reaction, as well as predicting the products of a reaction based on the reactants.

Here is an example of a balancing chemical equations worksheet and its answer:

Directions: Balance the following chemical equations by adding coefficients (numbers in front of atoms or molecules) where necessary.

  1. H2 + O2 -> H2O Answer: 2H2 + O2 -> 2H2O
  2. C3H8 + O2 -> CO2 + H2O Answer: C3H8 + 5O2 -> 3CO2 + 4H2O
  3. NaCl + AgNO3 -> AgCl + NaNO3 Answer: NaCl + AgNO3 -> AgCl + NaNO3
  4. Al + Fe2O3 -> Al2O3 + Fe Answer: 2Al + 3Fe2O3 -> Al2O3 + 3Fe
  5. Mg + O2 -> MgO Answer: Mg + O2 -> MgO
  6. CH4 + O2 -> CO2 + H2O Answer: CH4 + 2O2 -> CO2 + 2H2O
  7. C6H12O6 + O2 -> CO2 + H2O Answer: C6H12O6 + 6O2 -> 6CO2 + 6H2O
  8. Ca + Cl2 -> CaCl2 Answer: Ca + Cl2 -> CaCl2
  9. Pb + O2 -> PbO Answer: Pb + O2 -> PbO
  10. C5H12 + O2 -> CO2 + H2O Answer: C5H12 + 8O2 -> 5CO2 + 6H2O

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