Calendar: 1898-1899 Page 784

clU ENTRANCE EXHIBITIONS would have to be evaporated in order to cool 100 grams of water at 20 to the freezing point and to convert 25 grams of it into ice Define thermal conductivity metal plate square decimeter in area and cm thick has its opposite faces in contact with boiling water and with melting ice If its conductivity in units is 016 find how much heat will pass through the plate in 15 minutes Describe the method followed by Joule in determining the mechanical equivalent of heat State what corrections and allowances have to be made and the general results he arrived at -Cijemtetrg The following substances are heated to redness in air zinc mercuric oxide magnesium sulphur platinum describe accurately what takes place in each case What is the action of Chlorine on dry hydriodic acid ό potassium hydrate in the cold when hot phosphorus and antimony How are the following substances prepared Describe briefly their properties ozone-sulphur trioxide-silicon fluoride-and carbon monoxide What are the chief ores of zinc Describe the ex- traction of the metal from one of them Describe accurately method for determining the molecular weight of chemical compound Give an instance illustrating your answer Describe any experiment you have seen illustrating the oxidation of ammonia into nitrous and nitric acids or their salts VI -30נ tan Describe the structure and contents of typical vege- table cell Describe the effect of light upon the growth of plant