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Ch.1 - Introduction: Matter, Energy, and Measurement
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.1 - Introduction: Matter, Energy, and MeasurementProblema 21c,d,e
Capitolo 1, Problema 21c,d,e

Label each of the following as either a physical process or a chemical process: (c) melting a piece of chocolate (d) burning fossil fuel (e) discharging a battery.

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Understand the difference between physical and chemical processes: A physical process involves changes in the state or appearance of a substance without altering its chemical composition, while a chemical process involves a change in the chemical composition of the substance.
Identify the process in question: The problem asks about melting a piece of chocolate.
Consider what happens during melting: When chocolate melts, it changes from a solid to a liquid state.
Determine if the chemical composition changes: During melting, the chemical structure of chocolate remains the same; only its physical state changes.
Conclude the type of process: Since melting involves a change in state without altering the chemical composition, it is a physical process.

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Physical Process

A physical process involves changes in the state or appearance of a substance without altering its chemical composition. Examples include phase changes like melting, freezing, and boiling, where the substance retains its original chemical identity despite changes in form.
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Physical Properties

Chemical Process

A chemical process involves a transformation that alters the chemical composition of a substance, resulting in the formation of new substances. This includes reactions such as combustion, oxidation, and synthesis, where the original materials undergo a chemical change.
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01:34
Chemical Properties Example

Melting

Melting is the transition of a substance from a solid to a liquid state due to the absorption of heat. In the case of chocolate, melting occurs when heat breaks the intermolecular forces holding the solid structure together, allowing the chocolate to flow while maintaining its chemical identity.
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Boiling Point and Melting Point
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