Question

what is a chemical reaction​

Answer 1

A chemical change is occurred when two or more substances combine to form a new substance. The new substance formed will have totally different physical and chemical properties from the initial substance. The substances that react in a chemical reaction are called as reactants and the substances that are formed after the chemical reaction are called as products.

The Law of Conservation of Mass: The law of conservation of mass states that matter can neither be created nor be destroyed in a chemical reaction. It means the no of atoms in the left side of the equation is always equal to the number of  atoms on the right side of the equation.

There are 6 types of chemical reactions:

• Combination reaction: In this reaction two substances combine to form a single product. A + B ===> C
• Decomposition reaction: In this reaction a single compound is broken down into simpler compounds by using heat, electricity and sunlight.A BC ====> A + B + C

• Displacement reaction: In this reaction a higher reactive metal displaces a low reactive metal from its aqueous solution. A + BC ===> AC + B
• Double Displacement reaction: This reaction occurs when parts of two ionic compounds are exchanged, making two new compounds. AB + CD ====> AC + BD
• Redox reaction: When reduction and oxidation occurs simultaneously.Reduction is losing of oxygen and gaining of Hydrogen. Oxidation is losing of Hydrogen and Gaining of oxygen.
• Neutralization reaction: Is double displacement reaction that occurs. When a strong acid reacts with a strong base to form a neutral salt a neutralization reaction takes place.  

Answer 2

Answer:

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