Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Science Class 9

Class 9 : Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

The document Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev is a part of the Class 9 Course Science Class 9.
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Our Objective

To verify the Law of Conservation of Mass during a chemical reaction.

The Theory 

What is meant by a chemical reaction?

A chemical reaction is process by which one set of chemical substances is transformed to another. There are different types of chemical reactions such as:

  • Acid-base Reactions
  • Precipitation Reactions
  • Synthesis Reactions
  • Oxidation-Reduction Reactions
  • Displacement Reactions
  • Decomposition Reactions  

 

Substances which chemically react are called reactants and the newly formed substances are called products.
A French chemist, Antoine Lavoisier, who is known as the father of modern chemistry, changed chemistry from a qualitative to a quantitative science. He proved that the mass of the products in a chemical reaction is equal to the mass of the reactants. There are no more atoms at the end of the chemical reaction than there were at the beginning.

The Law of Conservation of Mass states that matter can neither be created nor destroyed in a chemical reaction.

Examples:

  • Consider the formation of water molecule. Hydrogen combines with oxygen to form  a water molecule.

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

In this case, the total mass of the reactants = total mass of the products. Also, the number of atoms of hydrogen and oxygen in the reactants side and the products side are equal.

  • Carbon combines with oxygen at low concentration to form carbon monoxide.

 

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

 

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

In this case, the total mass of reactants and products also are equal. The number of atoms at the beginning and at the end is equal as well.

  •  Hydrochloric acid reacts with sodium hydroxide to form sodium chloride and water.

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

Theory - To verify the Law of Conservation of Mass during a Chemical Reaction, Chemistry, Science Class 9 Notes | EduRev

In this case, total mass of reactants = total mass of products.

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