10th - science - solved problems - T/M

A chemical reaction is described by a chemical equation, an expression that gives the identities and quantities of the substances involved in a reaction. A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow.

Chemical reactions are the processes by which chemicals interact to form new chemicals with different compositions. Simply stated, a chemical reaction is the process where reactants are transformed into products.

The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories. Some reactions will fit into more than one category.

Representation of a chemical reaction in terms of symbols and chemical formula of the reactants and products taking part in the reaction is known as a chemical equation. For example, \[N{H_3} + HCl \to N{H_4}Cl\], in this reaction ammonia and hydrochloric acid is reacting to form ammonium chloride.

Chemical equations are used to represent chemical reactions. Reactants change chemically into products. The law of conservation of matter requires that a proper chemical equation be balanced. Coefficients are used to show the relative numbers of reactant and product molecules.

A basic chemical formula is a basic form of representation for a chemical compound or molecule. Basic chemical formulas are written using the symbols for elements shown on the periodic table and subscripts which show how many atoms exist in a certain chemical substance. 

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