United States or Australia ? Vote for the TOP Country of the Week !
Calculate the grams of calcium oxide and barium oxide in the mixture. !Answers!: 1.824 grams CaO; 0.3877 gram BaO. The reader who desires a more extended discussion of the fundamental theory and its uses is referred to such books as Talbot and Blanchard's !Electrolytic Dissociation Theory! The unit charge is that which is dissociated with a hydrogen ion.
Part of the extra expenditure is, however, on railways and other reproductive works. History. The Portuguese established themselves on the west coast of Africa towards the close of the 15th century. The river Congo was discovered by Diogo Cam or Cao in 1482.
The ignited product is assumed to be CaO and the analyst reports 29.50% Ca in the sample. Owing to insufficient ignition, the product actually contained 8% of its weight of CaCO . What is the correct percentage of calcium in the sample, and what is the percentage error? !Answers!: 28.46%; 3.65% error. !Answer!: 0.2359 gram. What fraction of this volume of acid is used for oxidation?
In the centre rises the conical peak of Monte Cao, an extinct volcano, exactly resembling Vesuvius in conformation, and only wanting a curl of smoke issuing from its crater to make the illusion perfect. The foreground of the picture is formed by the deep indigo waters of the Mediterranean, diversified by a hundred sunny sails, and overhead hangs the cloudless Italian sky.
A limestone is found to contain 93.05% CaCO , and 5.16 % MgCO . Calculate the weight of CaO obtainable from 3 tons of the limestone, assuming complete conversion to oxide. What weight of Mg P O could be obtained from a 3-gram sample of the limestone? !Answers!: 1.565 tons; 0.2044 gram. A sample of dolomite is analyzed for calcium by precipitating as the oxalate and igniting the precipitate.
Calcium Oxide is a compound left after the burning of limestone, and is known as fresh burned lime, or quick lime. Its formula is CaO. It contains, when pure, 40 parts of calcium and 16 parts oxygen by weight. Carbon Dioxide is a compound whose formula is CO2. Calcium Carbonate, known also as carbonate of lime, has a definite composition, containing, when pure, 56 parts CaO and 44 parts CO2.
Fresh burned lime is only the stone after some worthless matter has been driven off by use of heat. The limestone, carbonate of lime, is represented by the formula CaCO3. When heat is applied under right conditions the carbon dioxide, CO2, is driven off, and there remains CaO, which is calcium oxide, called fresh burned lime.
H AsO + MgCl + 3NH OH = MgNH AsO + 2NH Cl + 3H O. !Answer!: 30.71 grams. !Answer!: 25.60 cc. If 0.6742 gram of a mixture of pure magnesium carbonate and pure calcium carbonate, when treated with an excess of hydrochloric acid, yields 0.3117 gram of carbon dioxide, calculate the percentage of magnesium oxide and of calcium oxide in the sample. !Answers!: 13.22% MgO; 40.54% CaO. 92.
Much had already been done, for in 1471 Fernando Po had reached the mouth of the Niger, and all the coast southward from Morocco was well known and visited annually, for slaves used to cultivate the vast estates in the Alemtejo; but it was not till 1484 that Diogo Cão, sent out by the king, discovered the mouth of the Congo, or till 1486 that Bartholomeu Diaz doubled the Cabo Tormentoso, an ill-omened name which Dom João changed to Good Hope.
Word Of The Day