Ch.1 - Introduction: Matter, Energy, and Measurement

Problem 1c

Chapter 1, Problem 1c

Which of the following figures represents (c) a pure compound, (More than one picture might fit each description.)

Verified step by step guidance

Step 1: Understand the definition of a pure compound. A pure compound consists of two or more different types of atoms chemically bonded together in a fixed ratio, forming molecules or a lattice structure.

Step 2: Examine each figure carefully to identify whether it shows only one type of molecule or formula unit composed of different atoms bonded together, rather than a mixture of different molecules or individual atoms.

Step 3: Look for figures where the atoms are connected in a consistent pattern representing a single chemical species, not just a collection of different atoms or multiple types of molecules.

Step 4: Exclude figures that show mixtures of different molecules or separate atoms, as these represent mixtures or elements, not pure compounds.

Step 5: Select all figures that depict a uniform arrangement of chemically bonded atoms in a fixed ratio, as these represent pure compounds.

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Key Concepts

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

Pure Compound

A pure compound consists of two or more elements chemically bonded in a fixed ratio, forming a substance with uniform properties. Unlike mixtures, pure compounds cannot be separated by physical means and have distinct chemical formulas.

Mixture vs. Pure Substance

Mixtures contain two or more substances physically combined without fixed ratios, allowing components to be separated by physical methods. Pure substances, including elements and compounds, have consistent composition and properties throughout.

Molecular Representation in Figures

Figures representing chemical substances use symbols or shapes to depict atoms and bonds. Identifying a pure compound involves recognizing consistent groupings of atoms bonded together, as opposed to separate or unbonded particles indicating mixtures or elements.

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Textbook Question

Which of the following figures represents (a) a pure element, (More than one picture might fit each description.)

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Textbook Question

Which of the following figures represents (b) a mixture of two elements, (More than one picture might fit each description.)

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Textbook Question

Which of the following figures represents (d) a mixture of an element and a compound? (More than one picture might fit each description.)

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Textbook Question

Which of the following diagrams represents a chemical change?

Musical instruments like trumpets and trombones are made from an alloy called brass. Brass is composed of copper and zinc atoms and appears homogeneous under an optical microscope. The approximate composition of most brass objects is a 2:1 ratio of copper to zinc atoms, but the exact ratio varies somewhat from one piece of brass to another. (a) Would you classify brass as an element, a compound, a homogeneous mixture, or a heterogeneous mixture?

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