Ch.3 Matter and Energy

Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 14th Edition

Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Not the one you use?Change textbook

Timberlake 14th Edition

Ch.3 Matter and Energy

Problem 75b

Chapter 3, Problem 75b

Classify each of the following mixtures as homogeneous or heterogeneous:
b. herbal tea

Verified step by step guidance

Understand the definitions of homogeneous and heterogeneous mixtures: A homogeneous mixture has a uniform composition throughout, meaning the components are evenly distributed and not visibly distinguishable. A heterogeneous mixture has a non-uniform composition, where the components are visibly distinct or unevenly distributed.

Consider the composition of herbal tea: When herbal tea is prepared, it typically involves steeping herbs in water, which extracts soluble compounds into the liquid.

Determine if the mixture is uniform: If the herbal tea is well-steeped and no solid particles (like herbs or leaves) are floating in the liquid, the mixture appears uniform and would be classified as homogeneous.

Account for visible particles: If the herbal tea contains visible particles, such as undissolved herbs or sediment, it would be classified as a heterogeneous mixture.

Conclude the classification: The classification depends on the specific preparation of the herbal tea. If it is clear and uniform, it is homogeneous. If it contains visible particles, it is heterogeneous.

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Key Concepts

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

Homogeneous Mixtures

Homogeneous mixtures are uniform in composition and appearance, meaning that the individual components are not distinguishable. An example is saltwater, where the salt is completely dissolved, creating a consistent solution. In these mixtures, any sample taken will have the same composition as any other sample.

Heterogeneous Mixtures

Heterogeneous mixtures consist of visibly different substances or phases. The components can often be separated by physical means, and their proportions can vary throughout the mixture. An example is a salad, where you can see and identify the individual ingredients, making it clear that the mixture is not uniform.

Colloids and Suspensions

Colloids and suspensions are specific types of heterogeneous mixtures. Colloids have particles that are small enough to remain dispersed but can scatter light, like milk. Suspensions contain larger particles that will settle over time, such as muddy water. Understanding these distinctions helps classify mixtures like herbal tea, which may contain suspended particles from the herbs.

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