From Hot to Cold Exploring Heat Capacity and Energy Flow

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📢 Receive Comprehensive Mathematics Practice Papers Weekly for FREE 😊 • Click this link to get: ▶️▶️▶️ https://iitutor.com/email-list/ ◀️◀️◀️ • Specific heat capacity is the amount of heat energy required to change the temperature of 1 g of a substance by one Kelvin (K). Water has a high specific heat capacity that is useful for many biological systems, as well as human needs. The heat energy changes that occur during physical and chemical reactions can be related to the kinetic and chemical potential energies of the initial and final states of the system. Chemists use the term enthalpy (H) to specify the heat content of a substance. The enthalpy of a system in a given state cannot be measured because we have no starting point with which to compare it. However, the change in enthalpy (ΔH) of a system can be measured by experimental means. The negative sign is added to the equation to provide negative values for processes in which heat is liberated (exothermic changes) and the temperature rises, and positive values for processes in which heat is absorbed (endothermic changes) and the temperature drops. The calorimeter is a device used to measure the heat released (or absorbed) by a physical or chemical process. A simple calorimeter can be constructed using a polystyrene foam cup. It consists of a known mass of water (or solution) in an insulated container equipped with a thermometer and stirrer. The initial temperature of the water is measured before a reaction takes place, such as addition of a heated objected or soluble salt. While the contents are stirred, the process takes place and the final temperature of water is measured. Then the calorimetry equation is used to calculate specific heat capacity or molar heat capacity (C). • CB4511 • • From Hot to Cold: Exploring Heat Capa...

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