Balancing chemical equation is a fundamental concept in Class 10 Science and a very common topic from which questions are asked in RBSE board examinations. Students often find difficulty in balancing equations using Hit and Trail Method. The only way to gain confidence in this topic is through consistent worksheet practice.
This detailed worksheet is designed for Class 10 students to provide step by step practice of balancing chemical equation form basic to exam-oriented level. This worksheet includes different types of chemical reactions like combination, decomposition, displacement and double displacement reaction.
Why do we need to balance a chemical equation?
According to the ‘Law of Conservation of Mass’ – Mass can neither be created nor destroyed in a chemical reaction. This means the total number of atoms of each element must remain the same before and after the reaction. So, we must balance a chemical equation.
Hit and Trail Method to Balance Chemical Equation
This method is easy for balancing chemical equation. You should follow the steps:
· Write the correct skeletal equation.
· Count the number of atoms of each element on both sides.
· Start balancing with metals, then non-metals, oxygen and hydrogen.
· Balance polyatomic ions like SO4, NO3 as a whole if they remain same on both sides.
· Recheck the number of atoms of each element.
· Never change the chemical formula of reactant and products
Chemical Equation Worksheet – 1 (Basic level)
(i) H2 + O2 →H2O
(ii) Fe + O2 → Fe2O3
(iii) C + O →CO2
(iv) Na + H2O → NaOH + H2
(v) Al + O2 →Al2O3
(vi) KClO3 →KCl + O2
(vii) Zn + HCl →ZnCl2 +H2
(viii) CaCO3 →CaO + CO2
(ix) Mg + O2 →MgO
(x) C2H6 + O2 →CO2 + H2O
Chemical Equation Worksheet – 2 (Moderate level)
(xi) Al + HCl →AlCl3 + H2
(xii) FeSO4 →Fe2O3 + SO2 +SO3
(xiii) NaOH + H2SO4 →Na2SO4 + H2O
(xiv) CuO + H2 →Cu + H2O
(xv) AgNO3 + NaCl →AgCl NaNO3
Chemical Equation Worksheet – 3 (Exam-Oriented level)
(xvi) BaCl2 + H2SO4 →BaSO4 + HCl
(xvii) NH4NO2 →N2 + H2O
(xviii) NH3 + O2 →NO+ H2O
(xix) Pb(NO3)2 →PbO + NO2 +O2
(xx) KMnO4 + HCl →KCl + MnCl2 + H2O + Cl2
Answers to Worksheet -1
(i) 2H2 + O2 → 2H2O
(ii) 4Fe + 3O2 → 2Fe2O3
(iii) C + O2 → CO2
(iv) 2Na + 2H2O → 2NaOH + H2
(v) 4Al + 3O2 → 2Al2O3
(vi) 2KClO3 → 2KCl + 3O2
(vii) Zn + 2HCl → ZnCl2 +H2
(viii) CaCO3 →CaO + CO2
(ix) 2Mg + O2 →2MgO
(x) 2C2H6 + 7O2 → 4CO2 + 6H2O
Answers to Worksheet – 2
(xi) 2Al + 6HCl → 2AlCl3 + 3H2
(xii) 2FeSO4→Fe2O3 + SO2 +SO3
(xiii) 2NaOH + H2SO4 →Na2SO4 + 2H2O
(xiv) CuO + H2 →Cu + H2O
(xv) AgNO3 + NaCl →AgCl + NaNO3
Answers to Worksheet – 3
(xvi) BaCl2 + H2SO4 →BaSO4+ HCl
(xvii) NH4NO2 →N2+ 2H2O
(xviii) 4NH3 + 5O2 → 4NO+ 6H2O
(xix) 2Pb(NO3)2 → 2PbO+ 4NO2 +O2
(xx) 2KMnO4 + 16HCl → 2 KCl+ 2MnCl2 + 8H2O + 5Cl2
Types of Chemical Reactions Included in the Worksheet
This worksheet covers all important chemical reactions from the class 10 Science
i. Combination reactions
ii. Decomposition reactions
iii. Displacementreactions
iv. Double displacement reactions
v. Neutralisation reactions
vi.Redox reactions
Common Mistakes in Balancing Chemical Equation
· Changing subscript in chemical formula
· Forgetting to balance oxygen and hydrogen in the last
· Ignoringpolyatomic ions
· Not verifying final atom counts
You should not do the above mistakes in balancing chemical equations.
Exam Tips for Balancing Chemical Equations
· Always show rough work in exams.
· Write steps clearly if asked for method.
· Practice at least 10 equations daily for one week.
· Focus on frequency asked reactions types.
Related Topics
1. Hit and Trail Method for balancing equation
Frequently Asked Questions
Q1. Why do we balance chemical equations?
Answer- We balance chemical equations to follow the law of conservation of mass.
Q2. Which method is used to balance the chemical equation in class 10?
Answer – Hit and Trail method
Q3. What are the main types of chemical reaction in class 10 science?