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Showing posts from May 3, 2015

How To Turn Water into Wine or Blood

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This popular chemistry demonstration is often called turning water into wine or water into blood. It's really asimple example of a pH indicator. Phenolphthalein is added to water, which is then poured into a second glass containing a base. If the pH of the resulting solution is right, you can make the water turn from clear to red to clear again, as long as you like. Here's How: Sprinkle sodium carbonate to coat the bottom of a drinking glass. Fill a second glass halfway full of water. Add ~10 drops phenolphthalein indicator solution to the water. The glasses can be prepared in advance. To change water into wine or blood, pour the water with indicator into the glass that contains the sodium carbonate. Stir the contents to mix the sodium carbonate, and the water will change from clear to red. If you like, you can use a straw to blow air into the red liquid to change it back to clear. The principle is the same as for thedisappearing ink formula. Phenolphthalein is an a

Bromine Facts

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Bromine Atomic Number:  35 Symbol:  Br Atomic Weight:  79.904 Electron Configuration: [Ar]4s 2 3d 10 4p 5 Word Origin: Greek bromos:  stench Element Classification: Halogen Discovery:  Antoine J. Balard(1826, France) Density (g/cc):  3.12 Melting Point (°K):  265.9 Boiling Point (°K):  331.9 Appearance:  reddish-brown liquid, metallic luster in solid form Isotopes:  There are 29 known isotopes of bromine ranging from Br-69 to Br-97. Magnetic Ordering:  nonmagnetic Electrical Resistivity (20 °C):  7.8×1010  Ω·m Thermal Conductivity (300 K):  0.122  W·m−1·K−1 CAS Registry Number:  7726-95-6

Periodic Table of the Elements

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Zinc Atomic Number:  30 Symbol:  Zn Atomic Weight:  65.39 Discovery:  known since prehistoric time Electron Configuration:  [Ar] 4s 2  3d 10 Word Origin:  German  zinke : of obscure origin, probably German for tine. Zinc metal crystals are sharp and pointed. It could also be attributed to the German word 'zin' meaning tin. Isotopes:  There are 30 known isotopes of zinc ranging from Zn-54 to Zn-83 . Zinc has five stable isotopes: Zn-64 (48.63%), Zn-66 (27.90%), Zn-67 (4.10%), Zn-68 (18.75%) and Zn-70 (0.6%). Properties:  Zinc has a melting point of 419.58°C, boiling point of 907°C, specific gravity of 7.133 (25°C), with a valence of 2. Zinc is a lustous blue-white metal. It is brittle at low temperatures, but becomes malleable at 100-150°C. It is a fair electrical conductor. Zinc burns in air at high red heat, evolving white clouds of zinc oxide. Uses:  Zinc is used to form numerous alloys,including brass, bronze, nickel silver, soft solder, Geman silve