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NDA Unit 6A1: Heat Transfer and Calorimetry — practice questions

Explore 10 free Unit 6A1: Heat Transfer and Calorimetry questions in NDA Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Unit 6A1: Heat Transfer and Calorimetry questions and exercises with answers

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All acids in aqueous solution release:Read the answer and worked solution →An indicator that turns RED in acidic solution and BLUE in basic solution is:Read the answer and worked solution →Acid + Base → Salt + Water is called:Read the answer and worked solution →The chemical name of common salt (used in cooking) is:Read the answer and worked solution →Bleaching powder used in disinfection of water has the formula:Read the answer and worked solution →Baking soda (sodium hydrogen carbonate) has the formula:Read the answer and worked solution →Washing soda is sodium carbonate decahydrate, formula:Read the answer and worked solution →When an acid reacts with a metal, the gas usually evolved is:Read the answer and worked solution →When a carbonate reacts with an acid, the gas evolved is:Read the answer and worked solution →An acid that is also a strong dehydrating agent and is used in car batteries is:Read the answer and worked solution →

Worked practice questions

All acids in aqueous solution release:

  1. Hydroxide ions (OH⁻)
  2. Hydronium ions (H₃O⁺)
  3. Sodium ions (Na⁺)
  4. Chloride ions (Cl⁻)
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Correct answer: B. Hydronium ions (H₃O⁺)

1. Acid in water: HA + H₂O → A⁻ + H₃O⁺. 2. The hydronium ion H₃O⁺ is responsible for the sour taste and characteristic acid behaviour. 3. Bases release OH⁻ instead. _Source: syllabus Science Ch 2 §2.1 Acids and Bases in Water_

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An indicator that turns RED in acidic solution and BLUE in basic solution is:

  1. Methyl orange
  2. Phenolphthalein
  3. Litmus
  4. Universal indicator
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Correct answer: C. Litmus

1. Litmus is the classic red↔blue indicator. 2. Red litmus turns blue in BASE; blue litmus turns red in ACID. 3. Phenolphthalein is colourless in acid, PINK in base. 4. Methyl orange is red in acid and yellow in base. _Source: syllabus Science Ch 2 §2.1.1 Indicators_

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Acid + Base → Salt + Water is called:

  1. Combustion
  2. Neutralisation
  3. Decomposition
  4. Precipitation
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Correct answer: B. Neutralisation

1. HCl + NaOH → NaCl + H₂O. 2. H⁺ + OH⁻ → H₂O is the net ionic equation. 3. Always exothermic; used in antacid tablets, soil correction. _Source: syllabus Science Ch 2 §2.1.3 Neutralisation Reaction_

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