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Writing and Balancing of Chemical Equations Video Lecture - Class 10

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1. What is meant by balancing a chemical equation?
Ans. Balancing a chemical equation means ensuring that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side. In other words, balancing a chemical equation involves adjusting the coefficients of the reactants and products so that the equation obeys the law of conservation of mass.
2. What is the importance of balancing a chemical equation?
Ans. Balancing a chemical equation is important because an unbalanced equation violates the law of conservation of mass, which states that matter cannot be created or destroyed. An unbalanced equation can also lead to incorrect predictions of the products of a chemical reaction and can cause confusion in stoichiometric calculations.
3. How do you balance a chemical equation?
Ans. To balance a chemical equation, start by writing the chemical formulae of the reactants and products. Next, count the number of atoms of each element on both sides of the equation. If the equation is unbalanced, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides of the equation. Continue adjusting the coefficients until the equation is balanced.
4. What is the difference between a chemical formula and a chemical equation?
Ans. A chemical formula is a shorthand representation of the elements and their respective proportions in a compound. It shows the number of atoms of each element in a molecule or formula unit. A chemical equation, on the other hand, is a symbolic representation of a chemical reaction. It shows the reactants on the left side of the equation and the products on the right side of the equation, separated by an arrow.
5. What are some common mistakes students make when balancing chemical equations?
Ans. Some common mistakes students make when balancing chemical equations include forgetting to adjust the coefficients of all of the reactants and products, using subscripts instead of coefficients to balance the equation, and failing to check that the equation obeys the law of conservation of mass. Another common mistake is to change the chemical formulae of the reactants and products to balance the equation, which can lead to incorrect predictions of the products of the reaction.
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