How to make the reaction equation?

Dmitry Ermolinsky
Dmitry Ermolinsky
February 8, 2013
How to make the reaction equation?

Reactions between various kinds of chemicals and elements are one of the main subjects of study in chemistry. To understand how to make up the reaction equation and use them for your own purposes, you need a sufficiently deep understanding of all the laws in the interaction of substances, as well as processes with chemical reactions.

Making equations

One of the ways to express a chemical reaction is - chemical equation. It contains the formula of the original substance and product, the coefficients that show how many molecules each substance has. All known chemical reactions are divided into four types: substitution, compound, exchange and decomposition. Among them, there are: redox, exogenous, ionic, reversible, irreversible, etc.

Learn more about how to make equations of chemical reactions:

  1. It is necessary to determine the name of the substances interacting with each other in the reaction. We write them on the left side of our equation.As an example, consider the chemical reaction that formed between sulfuric acid and aluminum. Reagents are located on the left: H2SO4 + Al. Next, write the sign "equal". In chemistry, you can meet the sign "arrow", which points to the right, or oppositely directed two arrows, they mean "reversibility." The result of the interaction of metal and acid is salt and hydrogen. Write down the products obtained after the reaction after the “equal” sign, that is, on the right. H2SO4 + Al = H2 + Al2 (SO4) 3. So, we can see the reaction scheme.
  2. To compile a chemical equation, it is imperative to find the coefficients. Let's return to the previous scheme. Let's look at its left side. The composition of sulfuric acid contains atoms of hydrogen, oxygen and sulfur, in an approximate ratio of 2: 4: 1. In the right part - 3 sulfur atoms and 12 oxygen atoms in the salt. Two hydrogen atoms are contained in a gas molecule. In the left part the ratio of these elements is 2: 3: 12
  3. To equalize the number of oxygen and sulfur atoms that are in the composition of aluminum (III) sulfate, it is necessary to put the factor 3 in front of the acid in the left side of the equation. Now we have 6 hydrogen atoms on the left side.In order to even the number of elements of hydrogen, you need to put 3 before the hydrogen in the right side of the equation.
  4. Now it remains only to equalize the amount of aluminum. Since the salt contains two metal atoms, in the left part before aluminum we set the coefficient 2. As a result, we obtain the reaction equation for this scheme: 2Al + 3H2SO4 = Al2 (SO4) 3 + 3H2

Having understood the basic principles of how to make up the equation of the reaction of chemicals, in the future it will not cause much difficulty to write down any reaction, even the most exotic one, in terms of chemistry.

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