Worksheet: Balancing Equations I. Fill in the blanks with the most appropriate term:
A tells the story of a chemical reaction. are the starting substances in the reaction while are the new substances that are formed. The large numbers in front of some of the formulas are called . These numbers are used to the equation because chemical reactions must obey the Law of of Matter. The number of atoms of each element on both sides of the equation must be because matter
cannot be or . When balancing equations, the only numbers that can be changed are ; remember that must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3

2. C3H8 + O2 CO2 + H2O

3. P4 + O2 P2O3

4. KNO3 KNO2 + O2

5. O2 + CS2 CO2 + SO2

6. KClO3 KCl + O2

7. N2 + H2 NH3

8. NaF + Br2 NaBr + F2

9. Al + HCl H +AlCl3

10. WO3 + H2 W + H2O

1. Chemical Equation 2. Reactants 3. Products 4. Coefficients 5. Balance 6. Conservation 7. Equal 8. Created 9. Destroyed 10. Coefficients 11. Subscripts

Explanation:

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explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.