Textbook Question
What type of quantity (for example, length, volume, density) do the following units indicate? a. mL
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Ch.1 - Introduction: Matter, Energy, and Measurement
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970
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Table of contents
- Ch.1 - Introduction: Matter, Energy, and Measurement111
- Ch.2 - Atoms, Molecules, and Ions166
- Ch.3 - Chemical Reactions and Reaction Stoichiometry138
- Ch.4 - Reactions in Aqueous Solution127
- Ch.5 - Thermochemistry104
- Ch.6 - Electronic Structure of Atoms109
- Ch.7 - Periodic Properties of the Elements107
- Ch.8 - Basic Concepts of Chemical Bonding102
- Ch.9 - Molecular Geometry and Bonding Theories120
- Ch.10 - Gases122
- Ch.11 - Liquids and Intermolecular Forces79
- Ch.12 - Solids and Modern Materials102
- Ch.13 - Properties of Solutions99
- Ch.14 - Chemical Kinetics153
- Ch.15 - Chemical Equilibrium83
- Ch.16 - Acid-Base Equilibria109
- Ch.17 - Additional Aspects of Aqueous Equilibria117
- Ch.18 - Chemistry of the Environment60
- Ch.19 - Chemical Thermodynamics109
- Ch.20 - Electrochemistry113
- Ch.21 - Nuclear Chemistry79
- Ch.22 - Chemistry of the Nonmetals52
- Ch.23 - Transition Metals and Coordination Chemistry57
- Ch.24 - The Chemistry of Life: Organic and Biological Chemistry7
Brown15th EditionChemistry: The Central ScienceISBN: 9780137542970Not the one you use?Change textbook
Chapter 1, Problem 69c
Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: c. a wood plank
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Understand the definitions: A pure substance has a uniform and definite composition, a solution is a homogeneous mixture with uniform composition throughout, and a heterogeneous mixture has a non-uniform composition.
Consider the composition of a wood plank: Wood is composed of various components such as cellulose, lignin, water, and other organic compounds.
Evaluate the uniformity: In a wood plank, these components are not uniformly distributed throughout the material.
Determine the classification: Since the components of a wood plank are not uniformly distributed, it does not fit the definition of a pure substance or a solution.
Conclude that a wood plank is a heterogeneous mixture because it has a non-uniform composition with distinct regions of different materials.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Pure Substance
A pure substance consists of a single type of particle and has a uniform and definite composition. It can be an element, like oxygen, or a compound, like water. Pure substances have consistent properties throughout, such as boiling and melting points, which distinguish them from mixtures.
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Classification of Matter Example
Solution
A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent). Solutions have a uniform composition and properties throughout, meaning that any sample taken from the solution will have the same ratio of solute to solvent. Common examples include saltwater and sugar dissolved in tea.
Heterogeneous Mixture
A heterogeneous mixture consists of two or more substances that remain physically separate and can be distinguished from one another. The components can vary in composition and properties throughout the mixture, such as in a salad or a wood plank, where different materials can be identified and separated.
Related Practice
Textbook Question
Two students determine the percentage of iron in a sample as a laboratory exercise. The true percentage is 34.43%. The students’ results for three determinations are as follows: 1. 34.44, 34.41, 34.46 2. 34.51, 34.56, 34.48 b. Precision can be judged by examining the average of the deviations from the average value for that data set. (Calculate the average value for each data set; then calculate the average value of the absolute deviations of each measurement from the average.) Which set is more precise?
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Textbook Question
Classify each of the following as a pure substance, a solution, or a heterogeneous mixture: b. a cup of coffee
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Textbook Question
(b) A(n) _________ reliably predicts the behavior of matter, while a(n) _________ provides an explanation for that behavior.
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Textbook Question
A copper refinery produces a copper ingot weighing 150 lb. If the copper is drawn into wire whose diameter is 7.50 mm, how many feet of copper can be obtained from the ingot? The density of copper is 8.94 g/cm3. (Assume that the wire is a cylinder whose volume 𝑉=𝜋𝑟2ℎ, where r is its radius and h is its height or length.)
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Textbook Question
Gold can be hammered into extremely thin sheets called gold leaf. An architect wants to cover a 100 ft x 82 ft ceiling with gold leaf that is five-millionths of an inch thick. The density of gold is 19.32 g/cm3. If gold costs \$1768 per troy ounce (1 troy ounce = 31.10348 g), how much will it cost the architect to buy the necessary gold?
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