Question

how to write a chemical equation write all the steps​

Answer 1

Answer:

best and easy method

Explanation:

The Algebraic Balancing Method:

This method of balancing chemical equations involves assigning algebraic variables as stoichiometric coefficients to each species in the unbalanced chemical equation. These variables are used in mathematical equations and are solved to obtain the values of each stoichiometric coefficient. In order to better explain this method, the reaction between glucose and oxygen that yields carbon dioxide and water has been considered as an example.

Step 1

The unbalanced chemical equation must be obtained by writing the chemical formulae of the reactants and the products.

In this example, the reactants are glucose (C6H12O6) and oxygen (O2) and the products are carbon dioxide (CO2) and water (H2O)

The unbalanced chemical equation is C6H12O6 + O2 → CO2 + H2O

Step 2

Now, algebraic variables are assigned to each species (as stoichiometric coefficients) in the unbalanced chemical equation. In this example, the equation can be written as follows.

aC6H12O6 + bO2 → cCO2 + dH2O

Now, a set of equations must be formulated (between the reactant and product side) in order to balance each element in the reaction. In this example, the following equations can be formed.

The equation for Carbon

On the reactant side, ‘a’ molecules of C6H12O6 will contain ‘6a’ carbon atoms.

On the product side, ‘c’ molecules of CO2 will contain ‘c’ carbon atoms.

In this equation, the only species containing carbon are C6H12O6 and CO2.

Therefore, the following equation can be formulated for carbon: 6a = c

The equation for Hydrogen

The species that contain hydrogen in this equation are C6H12O6 and H2

‘a’ molecules of C6H12O6 contains ‘12a’ hydrogen atoms whereas ‘d’ H2O molecules will contain ‘2d’ hydrogen atoms.

Therefore, the equation for hydrogen becomes 12a = 2d.

Simplifying this equation (by dividing both sides by 2), the equation becomes:

6a = d

The equation for Oxygen

Every species in this chemical equation contains oxygen. Therefore, the following relations can be made to obtain the equation for oxygen:

For ‘a’ molecules of C6H12O6, there exist ‘6a’ oxygen atoms.

‘b’ molecules of O2 contain a total of ‘2b’ oxygens.

‘c’ molecules of CO2 contain ‘2c’ number of oxygen atoms.

‘d’ molecules of H2O hold ‘d’ oxygen atoms.

Therefore, the equation for oxygen can be written as:

6a + 2b = 2c+ d

Step 3

The equations for each element are listed together to form a system of equations. In this example, the system of equations is as follows:

6a = c (for carbon); 6a = d (for hydrogen); 6a + 2b = 2c + d (for oxygen)

This system of equations can have multiple solutions, but the solution with minimal values of the variables is required. To obtain this solution, a value is assigned to one of the coefficients. In this case, the value of a is assumed to be 1. Therefore, the system of equations is transformed as follows:

a = 1

c = 6a = 6*1 = 6

d = 6a = 6

Substituting the values of a,c, and d in the equation 6a + 2b = 2c + d, the value of ‘b’ can be obtained as follows:

6*1 + 2b = 2*6 + 6

2b = 12; b = 6

It is important to note that these equations must be solved in a manner that each variable is a positive integer. If fractional values are obtained, the lowest common denominator between all the variables must be multiplied with each variable. This is necessary because the variables hold the values of the stoichiometric coefficients, which must be a positive integer.

Step 4

Now that the smallest value of each variable is obtained, their values can be substituted into the chemical equation obtained in step 2.

Therefore, aC6H12O6 + bO2 → cCO2 + dH2O becomes: C6H12O6 + 6O2 → 6CO2 + 6H2O

Thus, the balanced chemical equation is obtained.

The algebraic method of balancing chemical equations is considered to be more efficient than the traditional method. However, it can yield fractional values for the stoichiometric coefficients, which must then be converted into integers.

Answer 2

Answer:

➣ Chemical equation:

The symbolic representation of a chemical reaction is called a

chemical equation.

Features of a chemical equation:

1. • The reactants are written on the left hand side with a plus sign between them.
2. • The products are written on the right hand side with a plus sign between them.
3. • An arrow separates the reactants from the products. The arrow head points towards the products and indicates the direction of the reaction.

Skeletal chemical equation:

A chemical equation which simply represents the symbols and formulas of reactants and products taking part in the reaction is known as skeletal chemical equation for a reaction.

for example:

For the burning of Magnesium in the air, Mg + O2 → MgO is the skeletal equation.

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