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February 1 st  is Emilio Segré's birthday. Segré was an Italian physicist who discovered the first artificial element. He was visiting the University of California, Berkeley's radiation laboratory when he was given a sample of molybdenum that had been a target in the University's cyclotron that appeared to emit radiation from an unknown source. Segré identified the source of the radiation as an unknown element. The new element was named technetium after the artificial method it was created. Segré also discovered the element astatine and co-discovered the antiproton with Owen Chamberlain. The discovery of the antiproton would earn both men the 1959 Nobel Prize in Physics.

Did you know 96% of your body mass consists of just 4 elements or that your body consists of 50-75% water? Here's a look at the elemental chemical composition of the human body. You are welcome to download and print the infographic.

Bleach is one of those household chemicals that loses its activity over time. It doesn't matter whether or not the bleach container has been opened or not. Temperature is the primary factor affecting how long bleach remains active.                                        According to Clorox™ , the amount of hypochlorite that is added to their bleach depends on the season in which it is manufactured, because temperature affects the decomposition rate of sodium hypochlorite. So, more hypochlorite is added to bleach made in the summer than in cooler months. Clorox aims to maintain a 6% hypochlorite concentration for at least six months after the manufacturing date, assuming the bleach is stored around 70°F. It takes about 4-8 weeks from the time chlorine bleach is made to when it gets to a store so that you can buy it to take home. This leaves you 3-5 months where the bleach ...

Here's a fun and easy Valentine's Day chemistry demonstration. Take a pink liquid, heat it up and watch it turn colorless. Upon cooling, the color of the liquid will return to pink. Here's what you do: Prepare the Hot and Cold Valentine Solution Add a few drops of phenolphthalein indicator and a drop of concentrated ammonia to 500 ml of water in a beaker, flask or large test tube. Perform the Valentine's Day Demo Present the pink solution. You can heat the liquid over a hot plate or, in the case of the test tube, in a burner flame. Heating the solution causes a shift in the equilibrium between the unionized ammonia and the ionized ammonium hydroxide. The change in pH makes the pink-colored indicator turn colorless. If you do not experience a color change, there is too much ammonia in the solution, so dilute it further with water and try again.

Converting between Fahrenheit and Celsius temperature scales is useful if you are working temperature conversion problems, work in a lab, or simply want to know how hot or cold it is in a country that uses the other scale! It's easy to make the conversion. One way is to look at a thermometer that has both scales and simply read the value. If you're doing homework or need to do a conversion in a lab, you'll want the calculated values. You can use an online temperature converter or else do the math yourself. Here's what you do: Celsius to Fahrenheit Degrees F = 1.8 C + 32 Multiply the Celsius temperature by 1.8. Add 32 to this number. Report the answer in degrees Fahrenheit. Example: Convert 20°C into Fahrenheit. F = 1.8 C + 32 F = 1.8 (20) + 32 1.8 x 20 = 36 so F = 36 + 32 36 + 32 = 68 so F = 68°F 20°C = 68°F

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