Content Provider: The Chem Collective
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Displaying 1-20 of 30 results.
Acids and Bases
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| Type: | Course Related Materials |
Abstract: You can access the problems below via the Load Homework dialogue in the File menu of the Virtual Lab. They have been organized by concept and ranked by difficulty (A ranking of 1 denotes an easier problem; 5 is more challenging). Word files for these problems are provided so that you may edit and distribute ... More »
Calculating Molecular Weight
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| Type: | Course Related Materials |
Abstract: The molecular weight is the mass of one mole of a substance. Usually, the units used for this are grams per mole. In this movie, we show how to calculate the molecular weight of a substance from the atomic weights given on the periodic table. On another page, we use the molecular weight to convert between ... More »
Chemical Equilibrium
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| Type: | Course Related Materials |
Abstract: You can access the problems below via the Load Homework dialogue in the File menu of the Virtual Lab. They have been organized by concept and ranked by difficulty (A ranking of 1 denotes an easier problem; 5 is more challenging). Word files for these problems are provided so that you may edit and distribute ... More »
Composition of Mixtures
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| Type: | Course Related Materials |
Abstract: For certain mixtures, reactions can be used to determine the relative composition of a mixture. This is illustrated in the following video.
Composition Stoichiometry
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| Type: | Course Related Materials |
Abstract: Composition stoichiometry allows us to determine the number of atoms present in a collection of molecules, as shown in the following video.
Dilution
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| Type: | Course Related Materials |
Abstract: When you work in a laboratory, chances are you are starting off with a concentrated stock solution. Being able to create solutions of varying concentration from this is a useful skill. Solutions with known concentrations are often called "standard solutions." You can learn about the concept of dilution ... More »
Dimensional Analysis
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| Type: | Course Related Materials |
Abstract: Dimensional analysis allows us to change the units used to express a value. For instance, it allows us to convert between volume expressed in liters and volume expressed in gallons. The following video gives a brief overview of dimensional analysis, including conversion between the amount of a substance ... More »
Empirical Formula Defined
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| Type: | Course Related Materials |
Abstract: The following video defines empirical formula and discusses various ways in which it is used.
Finding Empirical Formula from an Elementary Analysis
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| Type: | Course Related Materials |
Abstract: On another page, we discuss how to obtain the empirical formula from a given molecular formula. Here, we consider how to obtain the empirical formula from an elemental analysis of a sample. Remember that comparing the empirical formula obtained from an elemental analysis with that from a molecular formula ... More »
Finding the Empirical Formula from a Molecular Formula
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| Type: | Course Related Materials |
Abstract: Elemental analysis is a useful qualitative analysis technique since it allows us to check if a sample is consistent with a given molecular formula. For instance, suppose we believe our sample is benzene (C6H6). We can compare the following:The empirical formula (CH) obtained from the molecular formula ... More »
Limiting Reagents
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| Type: | Course Related Materials |
Abstract: We are now ready to pull everything we know about reaction stoichiometry together, and answer the question: Given some initial amount of reactants, what should be present after a chemical reaction goes to completion? The procedure for answering this question is often called the "limiting reagent problem." ... More »
Meals-Ready-To-Eat Scenario
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| Type: | Course Related Materials |
Abstract: You and a friend are hiking the Appalachian Trail when a storm comes through. You stop to eat, but find that all available firewood is too wet to start a fire. From your Chem 106 class, you remember that heat is given off by some chemical reactions; if you could mix two solutions together to produce ... More »
Measuring Density
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| Type: | Course Related Materials |
Abstract: The following video illustrates the concept of density and explains how density is measured.
Mixed Reception Scenario
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| Type: | Course Related Materials |
Abstract: This activity is set in a research group that is developing an antivenom for spider bites. In the opening scene, Nelson Pogline, a talented graduate student, dies unexpectedly at a university reception. As a detective, you must use chemistry concepts to determine if this was murder and if so, solve the ... More »
Molarity and Density
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| Type: | Course Related Materials |
Abstract: You can access the problems below via the Load Homework dialogue in the File menu of the Virtual Lab. They have been organized by concept and ranked by difficulty (A ranking of 1 denotes an easier problem; 5 is more challenging). Word files for these problems are provided so that you may edit and distribute ... More »
Ozone Scenario
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| Type: | Course Related Materials |
Abstract: During the first kinetics lecture, we traced the efforts of atmospheric chemists to explain the depletion of ozone in the upper atmosphere. (The powerpoint slides have been posted on Blackboard for your review.) U2 spy planes gathered much of the initial data that linked ClO in the stratosphere to the ... More »
Periodic Table
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| Type: | Course Related Materials |
Abstract: A reference and instruction for scientists of all levels. What chemistry software package would be complete without a periodic table? The actual use of this applet in the classroom is quite simple. Simply click on the desired element and data as well as a graphical plot of electron configurations will ... More »
Product Formation and Percent Yield
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| Type: | Course Related Materials |
Abstract: In another tutorial, we considered the amount of reactant consumed by a chemical reaction. Here, we'll consider the amount of product formed by a reaction.
Quantitative Analysis
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| Type: | Course Related Materials |
Abstract: You can access the problems below via the Load Homework dialogue in the File menu of the Virtual Lab. They have been organized by concept and ranked by difficulty (A ranking of 1 denotes an easier problem; 5 is more challenging). Word files for these problems are provided so that you may edit and distribute ... More »
Reaction Stoichiometry
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| Type: | Course Related Materials |
Abstract: Reaction stoichiometry allows us to determine the amount of substance that is consumed or produced by a reaction. The following video considers the first part of this: how much of a reactant is consumed in a chemical reaction. Product formation is discussed elsewhere.