Chemical Equations — Telangana (SSC) Class 10 Science Solutions (Free)
Free step-by-step Telangana (SSC) Class 10 Science solutions for "Chemical Equations" — important questions with detailed answers, download PDF for board exam preparation.
TL;DR: Free step-by-step Telangana (SSC) Class 10 Science solutions for "Chemical Equations" — important questions with detailed answers, download PDF for bo…
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Q1: What is a chemical equation? Explain with an example.
A chemical equation is a symbolic representation of a chemical reaction using formulas and symbols.
Example: 2H₂ + O₂ → 2H₂O
Left side (reactants) = elements/compounds that react
Right side (products) = new substances formed
Numbers (coefficients) show molar ratios to balance atoms
Q2: Balance the equation: Fe + O₂ → Fe₂O₃
Step 1: Count atoms on each side
Reactants: Fe=1, O=2 | Products: Fe=2, O=3
Step 2: Balance Fe: multiply Fe by 4 → 4Fe
Step 3: Balance O: need 6 oxygen atoms, multiply O₂ by 3 → 3O₂
Step 4: Balanced equation: 4Fe + 3O₂ → 2Fe₂O₃
Verify: Fe=4 both sides, O=6 both sides ✓
Q3: Define decomposition reaction with two examples.
Decomposition reaction: A single compound breaks into two or more simpler substances.
Example 1: 2PbO → 2Pb + O₂ (lead oxide decomposes)
Example 2: 2H₂O₂ → 2H₂O + O₂ (hydrogen peroxide decomposes)
These are reverse of combination reactions
Q4: What is a displacement reaction? Give one example.
Displacement reaction: An element displaces another element from its compound.
Example: Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
Here copper displaces silver from silver nitrate.
Reactivity order must be followed: more reactive element displaces less reactive one
Q5: Balance: C + O₂ → CO₂
Step 1: Count atoms
Left: C=1, O=2 | Right: C=1, O=2
Step 2: Already balanced (no coefficients needed)
Balanced equation: C + O₂ → CO₂
Verify: C=1, O=2 on both sides ✓
Showing 5 of 7 questions — full solutions on the page.