Free Game to Practice Chemistry Knowledge! Also available for your iPhone/iPad/iPod here or Android device here.
Brought to you by the Chemistry Department at Stetson University. The entire content of this web site is copyrighted by Stetson University under the copyright laws of the United States (Title 17, U.S. Code). You are welcome to repost for educational purposes. Any commercial use is strictly prohibited. NSTA Learning Center. Details Description Science Objects are two hour on-line interactive inquiry-based content modules that help teachers better understand the science content they teach.
This Science Object is the second of three Science Objects in the Atomic Structure SciPack. It explores the structure-related properties that make one type of atom different from another, and looks more closely at the role of the neutron. The number of protons in the nucleus determines what an atom's electron configuration can be and so defines the element and its properties. Additional Info Technical National Standards Correlation. Halflife. The applet lists a "halflife" for each radioactive isotope.
What does that mean? The halflife is the amount of time it takes for half of the atoms in a sample to decay. The halflife for a given isotope is always the same ; it doesn't depend on how many atoms you have or on how long they've been sitting around. For example, the applet will tell you that the halflife of beryllium 11 is 13.81 seconds. Let's say you start with, oh, 16 grams of 11Be. Hmmm...so a lot of decays happen really fast when there are lots of atoms, and then things slow down when there aren't so many.
That's exactly right. Notice how the decays are fast and furious at the beginning and slow down over time; you can see this both from the color changes in the top window and from the graph. You'll also notice that the pattern of atoms in the top picture is random-looking, and different each time you run the applet, but the graph below always has the same shape. The Chemistry Journey. Home. Common Compound Library A searchable database of over 800 common compound names, formulas, structures, and properties.
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Teaching analytical chemistry? Spectraschool is a great place to start. For lesson starters, try interactive Gridlocks, or our Starters for Ten puzzles. To search for an exact phrase on Learn Chemistry, enter the phrase in speechmarks. You can filter your search results by age, audience, resource type, context and subject, using the buttons that appear at left. Do you have a great resource to share with the world? Are you teaching or learning chemistry at university? Explore the RSC's comprehensive new Visual Elements Periodic Table, with podcasts, videos, trends, alchemy, and history information. To narrow down your search results, try the 'Refine Context/Subject search' buttons in the search results, at left.
Teaching primary science? Awesome Science Teacher Resources. The Periodic Table . Intro. The Periodic Table . It's Elementary . Building Elements. Chemistry Music Video 29: It's A Family Thing W A T E R. Balancing Act! mythbusters file # 3: Walking on the water ?