Classify each of the following as a pure substance or a mixture, If a mixture, indicate whether it is homogeneous or heterogeneous: (a) milk, (b) beer, (c) diamond, (d) mayonnaise.

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(a) Milk - homogeneous mixture (b) Beer - homogeneous mixture (c) Diamond - pure substance (d) Mayonnaise - homogeneous mixture

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01

Identifying Pure Substances and Mixtures

We need to classify each item as a pure substance or a mixture. A pure substance is a material with a constant composition and cannot be separated into simpler substances by physical means. A mixture is a combination of two or more substances, which can be separated by physical means. (a) Milk (b) Beer (c) Diamond (d) Mayonnaise
02

Identifying Homogeneous and Heterogeneous Mixtures

For the items classified as mixtures, we now need to determine if they are homogeneous or heterogeneous. A homogeneous mixture is a mixture with a uniform composition throughout, while a heterogeneous mixture has regions with different compositions. (a) Milk is a mixture, as it contains water, proteins, fats, and other components mixed together. It has a uniform composition throughout, so it is a homogeneous mixture. (b) Beer is also a mixture, as it is composed of water, ethanol, and other compounds. It has a uniform composition throughout, so it is a homogeneous mixture. (c) Diamond is a pure substance, as it is composed of only one type of atom (carbon) and has a constant composition. (d) Mayonnaise is a mixture, as it is made up of oil, vinegar, and other ingredients. It has a uniform composition throughout, so it is a homogeneous mixture. So, in conclusion: (a) Milk - homogeneous mixture (b) Beer - homogeneous mixture (c) Diamond - pure substance (d) Mayonnaise - homogeneous mixture

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