Keys-by-TEARN mobile platform
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Showing posts with label chem-series. Show all posts
Showing posts with label chem-series. Show all posts

Nov 15, 2010


The following is an actual question given on a University of Washington chemistry mid term.

The answer by one student was so 'profound' that the professor shared it with colleagues, via the Internet, which is, of course, why we now have the pleasure of enjoying it as well :

Bonus Question: Is Hell exothermic (gives off heat) or endothermic (absorbs heat)?

Most of the students wrote proofs of their beliefs using Boyle's Law (gas cools when it expands and heats when it is compressed) or some variant.

One student, however, wrote the following:
First, we need to know how the mass of Hell is changing in time. So we need to know the rate at which souls are moving into Hell and the rate at which they are leaving. I think that we can safely assume that once a soul gets to Hell, it will not leave. Therefore, no souls are leaving. As for how many souls are entering Hell, let's look at the different religions that exist in the world today.

Most of these religions state that if you are not a member of their religion, you will go to Hell. Since there is more than one of these religions and since people do not belong to more than one religion, we can project that all souls go to Hell. With birth and death rates as they are, we can expect the number of souls in Hell to increase exponentially. Now, we look at the rate of change of the volume in Hell because Boyle's Law states that in order for the temperature and pressure in Hell to stay the same, the volume of Hell has to expand proportionately as souls are added.

This gives two possibilities:

1. If Hell is expanding at a slower rate than the rate at which souls enter Hell, then the temperature and pressure in Hell will increase until all Hell breaks loose.

2. If Hell is expanding at a rate faster than the increase of souls in Hell, then the temperature and pressure will drop until Hell freezes over.

So which is it?

If we accept the postulate given to me by Teresa during my Freshman year that, 'It will be a cold day in Hell before I sleep with you,' and take into account the fact that I slept with her last night, then number two must be true, and thus I am sure that Hell is exothermic and has already frozen over. The corollary of this theory is that since Hell has frozen over, it follows that it is not accepting any more souls and is therefore, extinct......leaving only Heaven, thereby proving the existence of a divine being which explains why, last night, Teresa kept shouting 'Oh my God.'

Jun 27, 2010

Chemistry Series Approved and Ready for Download

The chemistry series of 5 apps has been finally approved by Apple, Palm, and Google.

Enjoy this slideshow.

App-Store Links

  • Kids Chem: at Android Marketplace | iPhone App Store | Palm Catalog

  • Chemistry Collection: at Android Marketplace | iPhone App Store | Palm Catalog

  • Chem AP Collection: at Android Marketplace | iPhone App Store | Palm Catalog
  • Jun 10, 2010

    Chemistry Series, Concept Maps, Age Appropriate Content

    Our Chemistry App has been updated to a three-book series for kids, teens, and adults. Here is a chronicle of what we have learned.

    The Chemistry Series

    We've compiled over 5,000 terms and simplified to create the following books:
    • Kids Chem - 150 terms in 5 chapters, appropriate for middle school learners.
    • Chemistry - Over 600 terms in over 10 chapters, appropriate for high school learners.
    • Chem AP: The Advanced Placement book has over 1,200 terms in 14 chapters targeting AP learners in high school, college learners, and what the UK calls A learners.
    The above concept-map categorizes the critical parts and process at the top; and stable objects at the bottom for the entire chemistry collection.

    Does one picture replace a thousand terms?

    Age Appropriate

    Each book, app, collection differs as follows:
    • Number of terms
    • Choice of terms to match the age group
    • Sentences to describe the term (ie kids versions avoid recursive terms that confuse)
    • Concept map for each chapter to match the depth of subject exploration
    Naming Chemical Compounds

    Chemistry has a system for naming millions of potential compounds. Here is the concept map for primarily organic compounds:
    • Hydrocarbons are parts with only hydrogen and carbon as parts.
    • Classes of hydrocarbons vary according to electron bonding.
    • Substituents are classes of compound parts, the simplest of which is a hydrogen atom.
    • Substituents bond with hydrocarbons to create classes of chemicals.
    • Each hydrocarbon and substituent pair results in a new compound with consistent names.
    There is considerable confusion in the use of the term functional group. Among thousands of pages, Wikipedia volunteers, scientists, academics, and textbook authors seem to use the term to mean any of the above terms. The IUPAC definition seems to favor the strict use of functional groups to mean substituents.

    To avoid confusion for learners, we emphasize hydrocarbons, substitutents, and classes - rather than the unclear use of the term functional groups.

    Nevertheless, the IUPAC naming convention brings order to a complex subject where millions of compounds demand their own name.

    The Subject of Chemistry

    Chemistry is the simplest of the sciences, requiring rudimentary knowledge of algebra and simple formula writing. But, the rich subject matter impacts every aspect of life - including metals, rocks, chemicals, plastics, technology, and biochemistry. Millions of professionals work to improve life by exploring and innovating with chemicals.

    Millions more need to join the effort to discover new knowledge. This three-book chem-series serves as another beginning for that journey.

    App-Store Links

  • Kids Chem: at Android Marketplace | iPhone App Store | Palm Catalog

  • Chemistry Collection: at Android Marketplace | iPhone App Store | Palm Catalog

  • Chem AP Collection: at Android Marketplace | iPhone App Store | Palm Catalog
  • Mar 26, 2010

    More Content for Paid Apps

    Released more chapters/lists for the following Keys collections.

    Available for Android and Palm.

    Feb 16, 2010

    Chemistry Basics

    Added Basic Terms to the collection of the Chemistry AP games. $4.99 at App Stores.
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