A chemical transformation accompanied by the release of heat is designated as ____________________?
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Answer: D. exothermic
Explanation
An exothermic chemical reaction is defined as one that releases thermal energy into surroundings. Bond formation in products releases more energy than is required to break reactant bonds. This net energy release causes the temperature of the immediate surroundings to increase. Thermochemistry classifies reactions based on whether they absorb or release thermal energy. Enthalpy changes for exothermic reactions carry a negative sign indicating heat loss from systems. Combustion and neutralization reactions are classic examples of highly exothermic chemical processes.
Hand warmers utilize exothermic crystallization processes to generate comfortable heat in cold weather. Industrial synthesis plants must install cooling systems to manage heat released by exothermic reactions. Cellular respiration releases thermal energy to maintain mammalian body temperatures in cold climates. Endothermic refers to chemical reactions that absorb thermal energy from their surroundings. Spontaneous describes reactions occurring without continuous external intervention based on free energy. Non-spontaneous indicates processes requiring ongoing energy input to proceed in a forward direction.
Related questions
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Answer: D. All
An increase in internal energy can reflect state changes, temperature rises, or chemical processes. Internal energy is a comprehensive state function encompassing all microscopic kinetic and potential energies. Adding he...
Q2. Any thermodynamic property whose magnitude depends exclusively on the initial and final states of the system is_______________?
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Answer: C. state function
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Q3. The physical process of pumping water uphill represents_______________?
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Answer: B. non-spontaneous process
Pumping water uphill requires continuous external work, making it a non-spontaneous process. Spontaneous processes occur naturally without requiring continuous external energy input from surroundings. Gravitational force...
Q4. The aggregate total energy possessed by a thermodynamic system is_________________?
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Answer: A. P.E + K.E
The total internal energy of a thermodynamic system is the sum of microscopic potential and kinetic energies. Kinetic energy accounts for molecular motion, while potential energy reflects intermolecular forces and bondin...
Q5. The enthalpy change associated with a chemical reaction can be quantified using ____________________?
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Answer: A. glass calorimeter
A glass calorimeter is designed to measure heat changes during reactions in solution. It provides thermal insulation to minimize heat exchange with the outside laboratory environment. Measuring temperature changes inside...
Q6. The standard SI unit for measuring heat energy is________________?
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Answer: A. J
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