Energy saver
How to sew boots

How to write the equation of chemical reactions

How to write the equation of chemical reactions

The main object of study in chemistry are reactions between the various chemical elements and compounds.

A thorough understanding of the interaction of lawssubstances and processes in chemical reactions makes it possible to manage and use for their own purposes. Chemical Equation - a way of chemical reaction expressions which are recorded starting materials of formula and the products coefficients indicating the number of molecules of each substance.

Chemical reactions are divided into coupling reaction, substitution, decomposition and metabolism.

Also among them are the redox, ionic, reversible and irreversible, exogenous etc.



Determine which substances interact with eachfriend in your reaction. Write them on the left side of the equation. For example, consider the chemical reaction between aluminum and sulfuric acid. Position the reagents left: Al + H2SO4

Next, place the sign "equal", as in a mathematical equation. In chemistry, you can come across an arrow pointing to the right, or two opposing arrows, "a sign of reversibility."

As a result of interaction with an acid metal salt and hydrogen are formed. The reaction products record after the equal sign on the right.

Al + H2SO4 = Al2 (SO4) 3 + H2

The result was a reaction scheme.


To make a chemical equation, younecessary to find the coefficients. The left part of the previously received part of the circuit consists of a sulfuric acid hydrogen atoms, sulfur and oxygen in a ratio of 2: 1: 4, the right side contains 3 sulfur atoms and oxygen atoms 12 as part of salt and two hydrogen atoms in a molecule of H2 gas. The left side of the ratio of these three elements is 2: 3: 12.


To equalize the amount of sulfur and oxygen atomsin structure (III) of aluminum sulfate in place before the left-acid ratio 3. Now the left part of the six hydrogen atoms. In order to equalize the number of hydrogen elements, set the coefficient 3 in front of him on the right side. Now the ratio of atoms in the two parts of 2: 1: 6.


It remains to equalize the amount of aluminum. Since the two metal atoms contained in the composition of salt, 2 to set the ratio of aluminum in the left part of the circuit.

As a result, you get the equation for the reaction of this scheme.

2Al + 3H2SO4 = Al2 (SO4) 3 + 3H2

Comments are closed.