Ch.1 - Intro to General ChemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Classify each of the following molecular diagrams as a pure substance or a mixture. 

Solution: Classify each of the following molecular diagrams as a pure substance or a mixture. 

Problem

Classify each of the following molecular diagrams as a pure substance or a mixture. 

The figure labeled (a) shows six space-filling molecules arranged in a free order. Each molecule consists of a black sphere connected to two red spheres arranged opposite to each other.The figure labeled (b) shows four space-filling molecules of the first type and twenty four space-filling molecules of the second type. The first type molecules are arranged above the second type molecules. Each molecule of the first type consists of five black spheres and twelve white spheres. Each molecule of the second type consists of a red sphere and two white spheres.The figure labeled (c) shows three space-filling molecules of the first type and eight space-filling molecules of the second type. All molecules are arranged in a free order. Each molecule of the first type consists of two black, one red, and five white spheres. Each molecule of the second type consists of a red sphere and two white spheres.The figure labeled (d) shows eight white spheres arranged in a free order.

Solution

We are being asked to classify each of the following molecular diagrams as either a pure substance or a mixture.

RecallMatter can be classified as either pure substance or mixture.

pure substance has a single composition. If a pure substance can be separated into simpler substances, it is a compound such as CO2. If it cannot be separated into simpler substances, it is an element such as He, Cland O3.

mixture has a variable composition. If a mixture does not have a uniform composition, it is heterogeneous such as a mixture of water and oil. If it has a uniform composition, it is homogenous such as air.

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