The Digital Scholar

  PRACTICAL 19 To find the specific heat by the method of mixture using polystyrene cups (used as container of negligible heat capacity).   VIVA VOCE 1. What is the principle behind the method of mixtures for determining specific heat? Ans:  The principle is based on the law of conservation of energy, where the heat lost by the hot substance is equal to the heat gained by the cold substance, assuming no heat is lost to the surroundings. 2. Why are polystyrene cups used as containers in this experiment? Ans:  Polystyrene cups are used because they have negligible heat capacity and good thermal insulation properties, minimizing heat exchange with the surroundings. 3.  What is specific heat capacity? Ans:  Specific heat capacity is the amount of heat required to raise the temperature of one gram of a substance by one degree Celsius. 4. Why is it important to ensure that the heat capacity of the container is negligible? Ans:  Ensuring the heat capacity of the container is negligible helps

  PRACTICAL 18 To find the density of a liquid using 5 ml syringe (instead of density bottle). VIVA VOCE Q1: What is the aim of the experiment? A1: The aim of the experiment is to find the density of a liquid using a 5 ml syringe instead of a density bottle. Q2: What is the basic principle used to determine the density of a liquid in this experiment? A2: The basic principle involves measuring the mass of a known volume of the liquid and then calculating its density using the formula \( \rho = \frac{m}{V} \), where \( \rho \) is density, \( m \) is mass, and \( V \) is volume. Q3: Describe the procedure of the experiment briefly. A3: The procedure involves the following steps: 1. Weigh an empty 5 ml syringe. 2. Fill the syringe with the liquid up to the 5 ml mark. 3. Weigh the syringe filled with the liquid. 4. Calculate the mass of the liquid by subtracting the mass of the empty syringe from the mass of the filled syringe. 5. Calculate the density using the mass and the known volume (5