The liquified gas in the tank is Chlorodifluoromethane [Link to wikipedia article] which is a formed by allowing chlorine and fluorine atoms to replace hydrogen atoms in the methane molecule in a textbook reaction known as substitution.
Showing posts with label Chemistry. Show all posts
Showing posts with label Chemistry. Show all posts
Monday, February 7, 2011
Chemistry : Air conditioner refrigerant fluids
This is a photograph of a tank of refrigerant fluid used by a repairman to recharge old air conditioners and refrigerators.
The liquified gas in the tank is Chlorodifluoromethane [Link to wikipedia article] which is a formed by allowing chlorine and fluorine atoms to replace hydrogen atoms in the methane molecule in a textbook reaction known as substitution.
The liquified gas in the tank is Chlorodifluoromethane [Link to wikipedia article] which is a formed by allowing chlorine and fluorine atoms to replace hydrogen atoms in the methane molecule in a textbook reaction known as substitution.
Thursday, February 3, 2011
Chem : Table of the Solubility of Ionic salts
Solubility List
Exceptions
All Sodium Salts are soluble
All Potassium Salts are soluble
All Amonnium are soluble
All Nitrates are soluble
These exceptions over-ride the solubility table below. A useful way of remembering this is to recall the word SPAN.
Solubility Table
| Soluble | Insoluble | |
| Sulphates | All soluble except | Barium, Lead, Calcium, Silver, Mercury |
| Hydroxides | Barium and calcium slightly soluble | All other hydroxides insoluble |
| Carbonates | All insoluble | |
| Chlorides | All soluble except | Silver, Lead, Mercury |
Chem : Metal Reactivity list
'O' level Chem Metal Reactivity list with Hydrogen and Carbon.
| Metal Reactivity list | ||
| Common Name | Symbol | Illustrative examples |
| Potassium | ||
| Sodium | ||
| Calcium | ||
| Magnesium | Burning Mg underwater | |
| Aluminum | Aluminum Pots. Thermite. Napoleon III VIP Dinnerware | |
| Carbon | The Blast Furnace | |
| Zinc | Galvanized Roofing | |
| Iron | ||
| Tin | The tin can | |
| Lead | Plumbum | |
| Hydrogen | ||
| Copper | ||
| Silver | Tarnish | |
| Gold | Aqua Regis |
Chem : Cation and Anion List
This is a list of cations and anions commonly encountered in 'O' Level Chemistry.
Common Cations
| Name | Formula |
| Aluminum | Al+3 |
| Ammonium | NH4+ |
| Barium | Ba+2 |
| Calcium | Ca+2 |
| Copper(I) | Cu+ |
| Copper(II) | Cu+2 |
| Iron(II) | Fe+2 |
| Iron(III) | Fe+3 |
| Hydrogen | H+ |
| Lead(II) | Pb+2 |
| Magnesium | Mg+2 |
| Potassium | K+ |
| Silver | Ag+ |
| Sodium | Na+ |
| Zinc | Zn+2 |
Common Anions
| Simple ions: | |
| Fluoride | F- |
| Chloride | Cl- |
| Bromide | Br- |
| Iodide | I- |
| Oxide | O2- |
| Sulfide | S2- |
| Hydroxide | OH- |
| Phosphate | PO43- |
| Sulfate | SO42- |
| Nitrate | NO3- |
| Carbonate | CO32- |
| Dichromate | Cr2O72- |
| Permanganate | MnO4- |
Q : Why the name Cations?
A : These ions are Positive in charge, and gather at the Cathode during electrolysis.
Q : Why the name Anions?
A : These ions are Negative in charge, and gather at the Anode during electrolysis.
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