Question

how to write a chemical equation?​

Answer 1

(1)Memorize the prefixes for number of atoms. 1: Mono-

2: Di-

3: Tri-

4: Tetra-

5: Penta-

6: Hexa-

7: Hepta-

8: Octa-

9: Nona-

10: Deca-

(2) Write the chemical symbol for the first element

For example: Dinitrogen hexafluoride. The first element is nitrogen and the chemical symbol for nitrogen is N.

(3)Add the number of atoms as a subscript

For example: Dinitrogen has a the prefix “di-“ which means 2; therefore, there are 2 atoms of nitrogen present.

Write dinitrogen as N2.

(4)Write the chemical symbol for the second element

For example: Dinitrogen hexafluoride. The second element is fluorine. Simply replace the “ide” ending with the actual element name. The chemical symbol for fluorine is F.

(5)Add the number of atoms present as a subscript

For example: Hexafluoride has a prefix of “hexa-“ which means 6; therefore, there are 6 atoms of fluorine present.

Write hexafluoride as F6.

The final chemical formula for dinitrogen hexafluoride is N2F6.

(6)Practice with some examples.

Sulfur dioxide: SO2

part 2:
(1)Identify the chemical symbols for the cations and anions
(2)Recognize polyatomic ions.
(3)Determine the valence charge of each element. 
(4)Balance the positive and negative charges of the ions
(5)Practice with some examples

PART 3:
(1)Identify all of the cations and anions in the reactants
(2)Switch the ions to build the products
(3)Write the full equation
(4)Balance the equation
(5)Note the states of matter.

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