Ch.2 - Atoms, Molecules & Ions

McMurry8th EditionChemistryISBN: 9781292336145Not the one you use?Change textbook

McMurry 8th Edition

Ch.2 - Atoms, Molecules & Ions

Problem 11

Chapter 2, Problem 11

The molecular illustration represents (LO 2.18) (a) a pure element (b) a mixture of two elements (c) a pure compound (d) a mixture of an element and a compound

Verified step by step guidance

Step 1: Understand the definitions of the terms involved. A pure element consists of only one type of atom. A mixture of two elements contains two different types of atoms not chemically bonded. A pure compound consists of molecules made from two or more different types of atoms chemically bonded. A mixture of an element and a compound contains both unbonded atoms and molecules.

Step 2: Analyze the molecular illustration provided. Identify the types of particles present in the illustration.

Step 3: Determine if the particles are atoms or molecules. Atoms represent elements, while molecules represent compounds.

Step 4: Check if the particles are all the same or if there are different types. This will help determine if the illustration represents a pure substance or a mixture.

Step 5: Based on the analysis, match the illustration to one of the options: (a) a pure element, (b) a mixture of two elements, (c) a pure compound, or (d) a mixture of an element and a compound.

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Key Concepts

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

Pure Element

A pure element consists of only one type of atom and cannot be broken down into simpler substances by chemical means. Examples include oxygen (O2) and gold (Au). Understanding pure elements is essential for distinguishing them from compounds and mixtures.

Pure Compound

A pure compound is a substance formed when two or more different types of atoms bond chemically in fixed proportions. Water (H2O) and carbon dioxide (CO2) are examples. Recognizing pure compounds is crucial for identifying chemical compositions in molecular illustrations.

Mixture

A mixture is a combination of two or more substances where each retains its individual properties and can be separated by physical means. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct phases). Understanding mixtures helps differentiate them from pure substances in molecular representations.

Related Practice

Textbook Question

Which sample has the greatest mass? (LO 2.16)(a) 5.5 mol of C (b) 2.1 mol of S (c) 4.2 mol of Be (d) 0.52 mol of Ag

What is the correct formula for sodium phosphate? (LO 2.24) (a) Na₃PO₄ (b) Na₃P (c) NaPO₄ (d) Na(PO₄)₂

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Textbook Question

How many protons, neutrons, and electrons are in 107Ag+? (LO 2.21)(a) protons = 47, neutrons = 60, electrons = 46 (b) protons = 47, neutrons = 107, electrons = 48 (c) protons = 60, neutrons = 47, electrons = 47 (d) protons = 47, neutrons = 107, electrons = 46

Is the red element on the following periodic table likely to be a gas, a liquid, or a solid?

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Textbook Question

How many atoms are present in 1.2 g of gold? (LO 2.16)(a) 2.5 * 1021 (b) 1.4 * 1026 (c) 7.2 * 1023 (d) 3.7 * 1021

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Textbook Question

Bromine has two naturally occurring isotopes; 79Br (mass of 78.918) and 81Br (mass of 80.916). If the atomic weight of bromine is 79.904, predict the mass spectrum of a sample of bromine atoms. (LO 2.17) (a)

(b)

(c)

(d)

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