http://www.merlot.org:80/merlot/ A search of MERLOT materials Copyright 1997-2013 MERLOT. All rights reserved. Thu, 23 May 2013 17:39:06 PDT Thu, 23 May 2013 17:39:06 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=759089 Primary resource wherein Joseph Priestley defends the theory of Phlogiston, and attempts to falsify theories of combustion, oxygen, and elements, or "the new system of chemistry״. This letter was written in 1796. http://www.merlot.org/merlot/viewMaterial.htm?id=738135 'Did you ever wonder why the periodic table is shaped the way it is, what gives each element its own unique set of properties, or even how elements combine to make everyday objects such as a cup of coffee? With “NOVA Elements,” explore an interactive periodic table, play a game hosted by David Pogue, or watch the two-hour NOVA program, “Hunting the Elements.”'This is a free app 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