http://www.merlot.org:80/merlot/ A search of MERLOT materials Copyright 1997-2013 MERLOT. All rights reserved. Tue, 21 May 2013 18:25:45 PDT Tue, 21 May 2013 18:25:45 PDT http://www.merlot.org:80/merlot/images/merlot.gif http://www.merlot.org:80/merlot/ 44 34 http://www.merlot.org/merlot/viewMaterial.htm?id=735047 A detailed analysis of buoyancy in the context of Felix Baumgartner's historic jump from 39 km altitude as the culminating event of the Red Bull Stratos mission. Buoyancy was provided by a helium-filled balloon that made the equipment less dense overall from the surrounding air.This article takes readers through the calculation of the density of the relevant gases (air and helium) and the net density of the ascent equipment. An error analysis shows that helium and air must have counter-diffused through the balloon wall and estimates the composition in the balloon. Also discussed are possible reasons for why the ascent equipment achieved a greater altitude than expected. http://www.merlot.org/merlot/viewMaterial.htm?id=732032 'This is a convenient chemistry tool for students and professionals to calculate molecular mass (molecular weight) of compounds and learn basic properties of chemical elements on iPad.Main features:1. Unique elements keyboard and digits keyboard are provided for user to input a chemical formula and then calculate its molecular mass. 2. User can also search an element and use it to build a chemical formula.3. Tapping on the number of H2O to change its value for hydrate.4. Long pressing on an element key, the app will display the basic properties of the element.5. Provides English pronunciations of all elements' name.6. Provides common ions, acids and bases reference7. "Tap Tap Elements" game makes the learning of the Periodic Table and elements more engaging.'This app costs $0.99 http://www.merlot.org/merlot/viewMaterial.htm?id=715497 'Molecules is an application for viewing three-dimensional renderings of molecules and manipulating them using your fingers. You can rotate the molecules by moving your finger across the display, zoom in or out by using two-finger pinch gestures, or pan the molecule by moving two fingers across the screen at once. These structures can be viewed in both ball-and-stick and spacefilling visualization modes.New molecules can be downloaded from either the RCSB Protein Data Bank (http://www.rcsb.org/pdb), an international repository of biological molecules and their 3-D structures, or NCBI's PubChem (http://pubchem.ncbi.nlm.nih.gov), a public database of compounds. Molecules can be downloaded directly to your handheld device and stored there for later viewing.'This is a free app. http://www.merlot.org/merlot/viewMaterial.htm?id=715157 'Chemical Equation balancer pro balances any given chemical equation.Need some help on your chemistry homework?Stuck on balancing a chemical equation?Don't know how to balance Chemical Equations? This is a useful tool with a user-friendly layout which can balance a given chemical equation. Ionic reactions are also supported. A very helpful tool for chemistry students, teachers, researchers, analysts, pharmacists etc. Just enter the reactants and products and press balance. The result will be displayed in no time.'This app costo $1.00 http://www.merlot.org/merlot/viewMaterial.htm?id=713378 'Taking introductory chemistry, or need a quick chemistry reference? Then you need the Wolfram General Chemistry Course Assistant. This comprehensive app for chemistry will help you quickly solve your homework problems, ace your tests, and quiz your understanding of basic chemistry concepts so you're prepared for your courses. Forget canned examples! The Wolfram General Chemistry Course Assistant solves your specific chemistry problems on the fly.This app covers the following topics applicable to Introductory Chemistry, General Chemistry, and AP Chemistry:- Determine properties of elements, chemicals, and ions- Compute properties of gases using various gas laws- Perform stoichiometric conversions for solutions- Balance equations- Compute the enthalpy, equilibrium constant, and theoretical yield of a reaction- Perform over 45 different computations'This app costs $4.99 http://www.merlot.org/merlot/viewMaterial.htm?id=713019 'This application can provide every possible formulas for anyone who study in AP Chemistry. News: This app supports iPad natively with full width and height. It can be used to build your own formulas reference in chemistry. It can store any cheat sheets, round-ups, quick reference cards, quick reference guides and quick reference sheets. You can organize the reference with clicks. Moreover, you can add description to a label on the image. For example, if you want to add more description about certain element, you can do that. Next time, when you click on that label, a transparent windows will appear with the description you have entered. Double Tap your finger on the image for navigation menu. Main Features: - Periodic Tables with lots element properties. - add reference - zoom in/out on reference - associate description on the label The reference cards consists of: Periodic TableCommon ions and their chargesEquations and ConstantsChemistry FundamentalsAtoms and Subatomic ParticlesMolecular massMolecular formula and empirical formulaBalancing Chemical equationsTemperature conversionIdeal Gas LawsSolubilityColligative PropertiesChemical EquilibriaReaction RateTheoretic and Percentage YieldThermodynamicsRedox Reactions and ElectrochemistryRadioactive decaySignificant figuresMany more'This app costs $0.99 http://www.merlot.org/merlot/viewMaterial.htm?id=706208 Resource to help effectively teach chemistry to students of varying abilities