Chapter 2: Atoms, Molecules, and Ions

2.1 Early Ideas in Atomic Theory [Go to section 2.1]

  1. Which of the following pairs of compounds can be used to illustrate the law of multiple proportions?
    1. [latex]\ce{NH4}[/latex] and [latex]\ce{NH4Cl}[/latex]
    2. [latex]\ce{ZnO2}[/latex] and [latex]\ce{ZnCl2}[/latex]
    3. [latex]\ce{H2O}[/latex] and [latex]\ce{HCl}[/latex]
    4. [latex]\ce{NO}[/latex] and [latex]\ce{NO2}[/latex]
    5. [latex]\ce{CH4}[/latex] and [latex]\ce{CO2}[/latex]
  2. A sample of chemical X is found to contain 5.0 grams of oxygen, 10.0 grams of carbon, and 20.0 grams of nitrogen. The law of definite proportion would predict that a 70 gram sample of chemical X should contain how many grams of carbon?
  3. How many of the following postulates of Dalton’s atomic theory are still scientifically accepted?
    1. All atoms of the same element are identical.
    2. Compounds are combinations of different atoms.
    3. A chemical reaction changes the way atoms are grouped together.
    4. Atoms are indestructible.
Show Selected Solutions
  1. D
  2. I, II, and III


2.2 Evolution of Atomic Theory [Go to section 2.2]

  1. Example
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  1. Example


2.3 Atomic Structure and Symbolism [Go to section 2.3]

  1. Example Question
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  1. Example Question


2.4 The Periodic Table [Go to section 2.4]

  1. Example Question
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  1. Example Question


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Chemistry Fundamentals Copyright © by Dr. Julie Donnelly, Dr. Nicole Lapeyrouse, and Dr. Matthew Rex is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License, except where otherwise noted.

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