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

Problem 13d

Chapter 1, Problem 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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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

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.

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.

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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