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Balancing Chemical Equations Questions Class 10

What is Balancing Chemical Equations

Balancing chemical equations is the process of writing chemical reactions so that the number of atoms of each element is the same on both sides of the equation. This is important because the law of conservation of mass states that matter can be neither created nor destroyed, so the number of atoms of each element must be the same before and after a chemical reaction.

To balance a chemical equation, you need to determine which elements are present in the reactants (the substances that are being combined) and the products (the substances that are formed). You then need to write the chemical equation with the correct number of atoms of each element on both sides of the arrow. This may require you to add coefficients (numbers in front of the chemical formulas) to balance the equation.

For example, consider the following unbalanced chemical equation: H2 + O2 → H2O. In this equation, the number of hydrogen atoms on the reactant side (2) does not match the number of hydrogen atoms on the product side (0). To balance the equation, we need to add a coefficient of 2 in front of the H2O on the product side: H2 + O2 → 2H2O. Now the number of hydrogen atoms on both sides of the equation is the same, and the equation is balanced.

Here are some example questions on balancing chemical equations for class 10 students:

  1. Balance the following chemical equation: H2 + O2 → H2O
  2. Balance the following chemical equation: Fe + H2O → Fe(OH)2 + H2
  3. Balance the following chemical equation: KNO3 + NaCl → KCl + NaNO3
  4. Balance the following chemical equation: SO2 + O2 → SO3
  5. Balance the following chemical equation: C2H6 + O2 → CO2 + H2O

Answers:

  1. H2 + O2 → 2H2O
  2. 2Fe + 6H2O → 2Fe(OH)2 + 3H2
  3. 2KNO3 + 2NaCl → 2KCl + 2NaNO3
  4. 2SO2 + O2 → 2SO3
  5. 2C2H6 + 7O2 → 4CO2 + 6H2O

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