Question

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Worksheet: Balancing Equations


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

Answer 1

Step-by-step explanation:

A Chemical Equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while Products are the new substances that are formed. The large numbers in front of some of the formulas are called Coefficients. These numbers are used to Balance the equation because chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be Equal because matter cannot be Created or Destroyed. When balancing equations, the only numbers that can be changed are Coefficients; remember that Subscripts must never be changed in order to balance an equation.

Q1) 4Al + 3O2 ---> 2Al2O3

Q2) C3H8 + 5O2 -----> 3CO2 + 4H20

Q3) P4 + 3O2 -----> 2P2O3

Q4) 2KNO3 -----> 2KNO2 + O2

Q5) 3O2 + CS2 ------> CO2 + 2SO2

Try the rest out and tell me did you understand it?

Answer 2

To balance a chemical equation, one must adjust the coefficients to ensure the same number of each element's atoms on both sides, obeying the Law of Conservation of Matter. Subscripts in formulas should never be altered, only coefficients.

To balance a chemical equation, start by identifying the most complex substance. Then, balance elements that appear in only one reactant and one product, adjusting the coefficients to achieve the same number of atoms of this element on both sides. Polyatomic ions that remain unchanged on both sides of the equation can be balanced as a unit. The remaining atoms are balanced last, often ending with the least complex substance. If fractional coefficients are used, multiply through to achieve whole numbers. Throughout this process, it's vital to ensure that you only alter coefficients, not the subscripts in chemical formulas, and to verify that each element has an equal number of atoms on both sides of the equation.

Coefficients are the large numbers placed in front of formulas to balance equations, reflecting the Law of Conservation of Matter. When balancing equations, matter cannot be created or destroyed, which requires an equal number of atoms of each element on both sides. Only the coefficients can be changed, while subscripts must remain unchanged.