Textbook Question
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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Ch.1 - Introduction: Matter, Energy, and Measurement
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement140
- Ch.2 - Atoms, Molecules, and Ions192
- Ch.3 - Chemical Reactions and Reaction Stoichiometry172
- Ch.4 - Reactions in Aqueous Solution156
- Ch.5 - Thermochemistry151
- Ch.6 - Electronic Structure of Atoms137
- Ch.7 - Periodic Properties of the Elements127
- Ch.8 - Basic Concepts of Chemical Bonding143
- Ch.9 - Molecular Geometry and Bonding Theories167
- Ch.10 - Gases147
- Ch.11 - Liquids and Intermolecular Forces97
- Ch.12 - Solids and Modern Materials129
- Ch.13 - Properties of Solutions126
- Ch.14 - Chemical Kinetics175
- Ch.15 - Chemical Equilibrium107
- Ch.16 - Acid-Base Equilibria127
- Ch.17 - Additional Aspects of Aqueous Equilibria133
- Ch.18 - Chemistry of the Environment88
- Ch.19 - Chemical Thermodynamics140
- Ch.20 - Electrochemistry137
- Ch.21 - Nuclear Chemistry99
- Ch.22 - Chemistry of the Nonmetals66
- Ch.23 - Transition Metals and Coordination Chemistry69
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry11
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 1, Problem 13c
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (c) aluminium
Verified step by step guidance1
Identify the nature of aluminium: Aluminium is a chemical element with the symbol Al and atomic number 13.
Determine if aluminium is a pure substance or a mixture: Since it is a chemical element, it is composed of only one type of atom.
Classify aluminium as a pure substance: Elements are considered pure substances because they cannot be separated into simpler substances by physical or chemical means.
Consider the characteristics of mixtures: Mixtures consist of two or more substances physically combined, which can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).
Conclude that aluminium is a pure substance, not a mixture, because it consists of only one type of atom and cannot be separated into different components.
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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 composition throughout. Examples include elements like aluminum and compounds like water. Pure substances have distinct physical and chemical properties that do not change regardless of the sample size.
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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 (like saltwater), or heterogeneous, where the composition varies (like a salad). The components of a mixture retain their individual properties.
Classification of Matter
Matter can be classified into pure substances and mixtures based on its composition. Understanding this classification helps in identifying materials and predicting their behavior in chemical reactions. For example, knowing that aluminum is a pure substance allows us to infer its consistent properties and behavior in various contexts.
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Related Practice
Textbook Question
Consider the jar of jelly beans in the photo. To get an estimateof the number of beans in the jar you weigh six beansand obtain masses of 3.15, 3.12, 2.98, 3.14, 3.02, and 3.09 g.Then you weigh the jar with all the beans in it, and obtain amass of 2082 g. The empty jar has a mass of 653 g. Based onthese data, estimate the number of beans in the jar. Justifythe number of significant figures you use in your estimate.
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Textbook Question
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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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (a) milk
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Textbook Question
Classify each of the following as a pure substance or a mixture. If a mixture, indicate whether it is homogeneous or heterogeneous: (b) beer
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Textbook Question
(b) An automobile speedometer with circular scales reading both miles per hour and kilometers per hour is shown. What speed is indicated, in both units? How many significant figures are in the measurements?
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