Guide
1
First of all, you need to learn the basic classes of organic and inorganic compounds.In the extreme case, you can be right in front of the crib, which can help during the job.After training still in memory will postpone the necessary knowledge and skills.
2
is a basic material covering and chemical properties as well as methods for the preparation of each class of compounds.They are usually presented in the form of general schemes, such as: 1. acid + base = salt + water oxide
2. Acid + base = salt + water
3. basic oxide + Acid = salt + water
4. Metal + (dilute acid)= G + hydrogen
5. soluble salt + salt = soluble + insoluble salt soluble salt
6. soluble alkali salt + = + insoluble base soluble salt
With the sight of the table solubility of salts, acids
and bases, as well as circuit-cribs canon them to solve the equation reactions.What is important is to have a complete list of such schemes, as well as information about the formulas and names of the different classes of organic and inorganic compounds.
3
After manage to make the equation itself, you need to check the spelling of chemical formulas.Acids, bases and salts are easily checked on the solubility of the table, which shows the ion charges acid residues and metals.It is important to remember that any formula should be generally electrically neutral, that is, the number of positive charges must match the number of negative ones.Be sure to account being taken of the indices that are multiplied to the corresponding charges.
4
If this stage is over and there is confidence in the correctness of writing equation chemical reaction , it can now be safely set ratios.The chemical equation is a conventional record reaction using chemical symbols, indices and ratios.At this point, the job is required to follow the rules: • Rate is placed before the chemical formula and applies to all elements within the composition of the substance.
• The index is made after the chemical element down a bit, and applies only to the left of a chemical element.
• If the functional group (eg, acid residue or a hydroxyl group) is in brackets, then you need to learn that two adjacent index (before and after the parenthesis) are multiplied.
• When counting the atoms of a chemical element is multiplied by the coefficient (does not add up!) On the index.
5
Then count the number of each chemical element so that the total number of items included in the starting materials coincided with the number of atoms making up the compounds of the reaction products formed .By the analysis and application of the above rules, you can learn to solve equations reactions that make up the chain of transformations of substances.