Ch.1 - Introduction: Matter, Energy, and Measurement

Brown - Chemistry: The Central Science 14th Edition

Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo

Brown 14th Edition

Ch.1 - Introduction: Matter, Energy, and Measurement

Problema 13d

Capitolo 1, Problema 13d

Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (d) iodine tincture.

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Understand the definitions: A pure substance has a uniform and definite composition, while a mixture contains two or more substances physically combined. A homogeneous mixture has a uniform composition throughout, whereas a heterogeneous mixture has a non-uniform composition.

Identify the components of iodine tincture: It typically consists of iodine dissolved in alcohol, often with water.

Determine if iodine tincture is a pure substance or a mixture: Since it contains more than one component (iodine and alcohol), it is a mixture.

Assess the uniformity of the mixture: Iodine tincture is a solution where iodine is evenly distributed in alcohol, making it a homogeneous mixture.

Conclude the classification: Iodine tincture is a homogeneous mixture because its composition is uniform throughout.

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Pure Substances

A pure substance consists of a single type of particle and has a uniform and definite composition. Examples include elements like gold and compounds like water. Pure substances have consistent properties such as melting and boiling points, which do not change regardless of the sample size.

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02:58

Classification of Matter Example

Mixtures

A mixture contains two or more different substances that are physically combined but not chemically bonded. Mixtures can be classified as homogeneous, where the composition is uniform throughout (like saltwater), or heterogeneous, where the composition varies (like a salad). The components of a mixture retain their individual properties.

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01:03

Solubility and Mixtures

Iodine Tincture

Iodine tincture is a solution of iodine in alcohol, commonly used as an antiseptic. It is classified as a homogeneous mixture because the iodine is evenly distributed throughout the alcohol, resulting in a consistent appearance and composition. Understanding this classification helps in identifying the nature of the solution and its applications.

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01:21

Beta Decay Reaction Example

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The photo below shows a picture of an agate stone. Jack, who picked up the stone on the Lake Superior shoreline and polished it, insists that agate is a chemical compound. Ellen argues that it cannot be a compound. Discuss the relative merits of their positions.

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