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.

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.

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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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Chemical Equations — Textbook Questions Answered (7)

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 ✓

Q6: What is a double displacement reaction? Name one example.

Double displacement reaction: Two compounds exchange their ions to form two new compounds. Example: AgNO₃ + NaCl → AgCl↓ + NaNO₃ Here Ag⁺ and Na⁺ exchange places with NO₃⁻ and Cl⁻ Usually involves precipitation (↓), gas evolution (↑), or water formation

Q7: Balance: Ca(OH)₂ + HCl → CaCl₂ + H₂O

Step 1: Count atoms Left: Ca=1, O=2, H=3, Cl=1 | Right: Ca=1, Cl=2, H=2, O=1 Step 2: Balance Cl by multiplying HCl by 2: 2HCl Step 3: Balance H and O by multiplying H₂O by 2: 2H₂O Step 4: Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O Verify: Ca=1, O=2, H=4, Cl=2 both sides ✓

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