how to write a chemical equation

Question 1

step 1

Answer 1

Write a skeletal equation by writing correct chemical formulas for each of the reactants and products. (If a skeletal equation is provided, skip this step and go to Step 2.)

Question 2

step 2

Answer 2

If an element occurs in only one compound on both sides of the equation, balance it first. If there is more than one such element, balance metals before nonmetals.

Question 3

step 3

Answer 3

If an element occurs as a free element on either side of the chemical equation, balance it last. Always balance free elements by adjusting the coefficient on the free element.

Question 4

step 4

Answer 4

Check to make certain the equation is balanced by summing the total number of each type of atom on both sides of the equation.

Question 5

remember

Answer 5

Remember, change only the coefficients to balance a chemical equation; never change the subscripts. Example: Write a balanced equation for the reaction of solid aluminum with aqueous sulfuric acid to form aqueous aluminum sulfate and hydrogen gas.

Question 6

what does the number in front of the equation tell you

Answer 6

The number in front of a chemical formula tells you how many molecules are present

e.g. There are 2 molecules of Hydrochloric acid
2 Hydrogen & 2 Chlorine

Question 7

what does the element symbol do

Answer 7

Element symbols may have 1 or 2 letters. Each starts with a CAPITAL.