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Dalton’s Atomic Theory: Understanding the Evolution of Chemistry-quiz

Dalton's Atomic Theory Quiz

Dalton's Atomic Theory Quiz

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Calculate Grams of Sodium Bicarbonate Easily (Step-by-Step)

Calculate Grams of Sodium Bicarbonate | Stoichiometry Solution Problem: How many grams of sodium bicarbonate are required to neutralize 10.0 ml of 0.902 M vinegar? (1) 8.4 g (2) 1.5 g (3) 0.75 g (4) 1.07 g Calculate Grams of Sodium Bicarbonate To determine the mass of sodium bicarbonate (NaHCO₃) required to neutralize vinegar ( acetic acid , CH₃COOH), we use principles of stoichiometry . Step 1: Balanced Chemical Equation This is a neutralization reaction : NaHCO₃ (s) + CH₃COOH (aq) → CH₃COONa (aq) + CO₂ (g) + H₂O (l) The stoichiometric ratio is 1 : 1 . Step 2: Calculate Moles of Acetic Acid Given: Volume (V) = 10.0 mL = 0.0100 L Molarity (M) = 0.902 mol/L n = M × V = 0.902 × 0.0100 = 0.00902 mol Step 3: Moles of Sodium Bicarbonate Since ratio is 1:1: n(NaHCO₃) = 0.00902 mol Step 4: Calculate Mass Molar Mass of NaHCO₃: Na = 22.99 g/mol H = 1.01 g/mol C = 12.01 g/mol O...
   Very Short Answer Questions  with answers (1-mark each) from the Class 10 CBSE Science Chapter  "Carbon and its Compounds"  — based on the questions you've listed: 1. Name the element whose one of the allotropic forms is buckminsterfullerene. Answer:  Carbon. 2. What are the two properties of carbon which lead to the formation of a large number of carbon compounds? Answer:  Catenation and tetravalency. **3. State whether the following statement is true or false: “Diamond and graphite are the covalent compounds of carbon element (C).”** Answer:  True. 4. Name the scientist who disproved the 'vital force theory' for the formation of organic compounds. Answer:  Friedrich Wöhler. 5. Name the element whose allotropic form is graphite. Answer:  Carbon. 6. In addition to some propane and ethane, LPG cylinders contain mainly two isomers of another alkane. Name the two isomers and write their condensed structural formulae. Answer: n-butane ...

Chemical Reactions and Equations (Class 10, CBSE)(mock test -30)

  Practice Questions – Chemical Reactions and Equations (Class 10, CBSE)(mock test -30) A. Multiple Choice Questions (MCQs) Which of the following is an endothermic reaction? a) Burning of coal b) Respiration c) Photosynthesis d) Condensation of steam Which law is followed while balancing chemical equations? a) Law of definite proportion b) Law of multiple proportion c) Law of conservation of mass d) Law of constant composition Which of the following is a double displacement reaction? a) Zn + H2SO4 → ZnSO4 + H2 b) 2H2O → 2H2 + O2 c) Na2SO4 + BaCl2 → BaSO4 + 2NaCl d) CH4 + 2O2 → CO2 + 2H2O Which of the following shows a chemical change? a) Melting of ice b) Burning of candle c) Dissolving sugar in water d) Breaking glass In the reaction: 2Mg + O2 → 2MgO Which substance is oxidized? B. Assertion-Reason Questions For each question, choose: (a) Both A and R are true, R is the correct explanation (b) Both A and R are true, but R is not the corr...