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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 17
Capitolo 1, Problema 17

A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we determine whether solids A and B and gas C are elements or compounds?

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Identify the gas C by comparing its properties to the known product of carbon burning in excess oxygen. When carbon burns in excess oxygen, it forms carbon dioxide (CO\_2), which is a compound, not an element.
Since gas C has the same properties as carbon dioxide, conclude that gas C is carbon dioxide, a compound.
Analyze the decomposition reaction: solid A decomposes into solid B and gas C (carbon dioxide). This suggests that solid A contains carbon and oxygen atoms combined in some way.
Because solid A decomposes into two different substances (solid B and gas C), solid A must be a compound, not an element.
Solid B is a new white substance formed after the release of carbon dioxide. Since it is different from A and formed by decomposition, solid B is also likely a compound, not an element.

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Thermal Decomposition

Thermal decomposition is a chemical process where a compound breaks down into simpler substances when heated, often in the absence of air. It helps identify whether a substance is a compound by observing if it splits into different products upon heating.
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Thermal Equilibrium

Identification of Gases by Properties

Gases can be identified by comparing their physical and chemical properties to known substances. For example, carbon dioxide (CO2) is produced when carbon burns in oxygen, so a gas with identical properties is likely CO2, indicating the nature of the gas released during decomposition.
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Chemical Properties

Distinguishing Elements from Compounds

Elements are pure substances that cannot be broken down further by chemical means, while compounds consist of two or more elements chemically combined. Observing decomposition into different substances indicates the original solid is a compound, while the products may be elements or compounds depending on their composition.
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Elemental Forms of Elements
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