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Which property of cone-shaped volcanoes in the Ring of Fire makes them particularly dangerous?
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8. Thermochemistry
Nature of Energy
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Which of the following best defines energy, and which is an example of energy on a small scale?
A
Energy is the ability to do work; an example on a small scale is the vibration of molecules in a substance.
B
Energy is the rate at which a reaction occurs; an example on a small scale is the speed of a chemical reaction.
C
Energy is the volume occupied by a substance; an example on a small scale is the space inside a molecule.
D
Energy is the amount of matter in an object; an example on a small scale is the mass of an atom.
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Step 1: Understand the definition of energy in the context of chemistry. Energy is commonly defined as the ability to do work or cause change, which is fundamental to chemical processes.
Step 2: Recognize examples of energy on a small scale. In chemistry, molecular vibrations, rotations, and movements represent forms of energy at the microscopic level.
Step 3: Evaluate each option by comparing its definition of energy to the accepted scientific definition. For example, 'energy is the rate at which a reaction occurs' actually describes reaction rate, not energy.
Step 4: Identify which example corresponds to energy on a small scale. Vibrations of molecules represent kinetic energy at the molecular level, making it a valid example.
Step 5: Conclude that the best choice is the one that correctly defines energy as the ability to do work and gives molecular vibration as an example of energy on a small scale.
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