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### Q1 helps & extras

 Chapter 1 and 2 This site discusses the original experiments that led to the Celsius temperature scale. This site gives a biography of the scientist who came up with the Celsius temprature scale. This site gives a biography of the scientist after whom the Fahrenheit temperature scale is named. This site gives a biography of the scientist after whom the Kelvin temperature scale is named. This site has more instruction on the factor-label method also known as dimensional analysis.  There are several worksheets at the bottom to give you more practice.   Factor-label method help This site has more instruction on the factor-label method. It is set to allow you to think about the solution and then click on a button to reveal the answer.   Significant figures help This site has a summary of the rules for significant figures as well as examples of how to use them.   Extra scientific notation problems This site gives you much practice converting from scientific notation to decimal or vice-versa.   This site gives goes over the kind of density problems you need to know how to solve. Set up for you to think about the solution and then click on a button to reveal the answer.   This site gives you more density practice problems.   This site gives you more practice problems on significant figures, scientific notation, unit conversion, and density.   An interesting little visual display that starts out looking at the universe in terms of very large scales and then increasingly zooms in on the earth by powers of 10. A nice trip from the scale of the universe to that of quarks!   Significant figures fable. Here is a nice fable about the importance of significant figures. It illustrates an important point - not paying attention to significant figures can be costly.   This is a clever little experiment that utilizes the concept of density. Click on the "how it works" link for an explanation.   More advanced unit conversions This site teaches you how to do more complex conversions such as conversions on density and speed units using a flash tutorial. There are also some practice problems at the end.   This site goes through many applications of the factor-label method. It starts out simple, but it gets pretty advanced.   This site discusses the idea that mass and energy are really different aspects of the same thing. This leads to Einstein's famous equation E=mc 2 .   This site teaches you how to use Einstein's famous equation. This is a type of mass conservation, because mass and energy are really just two aspects of the same thing. Thus, the proper Law of Mass Conservation must include the fact that mass can be converted into energy and vice-versa. This kind of conversion does not occur in ordinary chemical reactions.   Chapter 3 Classification and Properties of Matter   The classic element song with graphics.  A must see and hear.   This site gives you a nice flow chart to follow in order to determine whether a substance is an element, compound, heterogeneous mixture, or homogeneous mixture.   This site has a discussion of chemical and physical change.   This site has extra problems on identifying elements, compounds, and mixtures as well as chemical and physical changes.   This website has a very detailed periodic chart. You can click on a given element to learn a great deal about that element.   This website has an interesting visual interpretation of the periodic chart.               Measuring heat changes 15.1 and 15.2 This site has a discussion of the energy concepts discussed in Chapter 3 and 12.2-12.4.    This site has more problems on energy exchange.   This site gives examples of how to use Q = mC∆T   This site discusses how to solve calorimetry problems.   This site shows video of a teacher solving two calorimetry problems.   This website discusses a specific type of calorimeter, the "bomb" calorimeter. There is a link on this page to an animation that shows how a bomb calorimeter works.     Chapter 4  Atomic Theory This website discusses Democritus and his philosophy. This website has a biography of the creator of the Periodic Chart. An interesting bit of history. This is a lecture given by Dmitrii Mendeleev to the Chemical Society. It details his thoughts on why he created the perodic chart. This website has a good biography of John Dalton.  This website has excerpts from Dalton's seminal paper on his atomic theory.