Textbook Question
(a) How many significant figures should be reported for the volume of the metal bar shown here?
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Ch.1 - Introduction: Matter, Energy, and Measurement
Chapter 1, Problem 13a,b
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) air (b) chocolate with almond
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Understand the definitions: A pure substance has a uniform and definite composition, such as elements or compounds. A mixture consists of two or more substances physically combined, which can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).
Examine air: Air is a mixture of gases, primarily nitrogen, oxygen, and small amounts of other gases. Since the composition is uniform throughout, air is classified as a homogeneous mixture.
Examine chocolate with almond: This consists of chocolate and almonds mixed together. The composition is not uniform throughout, as you can see and separate the almonds from the chocolate. Therefore, it is classified as a heterogeneous mixture.
Summarize the classification: (a) Air is a homogeneous mixture. (b) Chocolate with almond is a heterogeneous mixture.
Reflect on the characteristics: Homogeneous mixtures have the same composition throughout, while heterogeneous mixtures have visibly different parts or phases.
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