Calendar: 1884-1885 Page 696

690 CLOTHWORKERS SCIENCE EXHIBITION 11 An ounce of platinum is heated to the temperature of furnace and then plunged into 14 ounces of water at the platinum and the water together acquire temperature of 2כ find the temperature of the furnace taking the specific heat of platinum at 035 -CI cmfct11 Give the composition both by weight and volume of nitric oxide In what important manufacture is it employed and for what purpose Express accurately by an equation the decomposition of arsenietted hydrogen hydrogen arsenide when passed through tube heated to redness ry chalk heated in gun barrel gives gas burning with blue flame Explain its formation and state the greatest possible volume in cubic centimetres procurable from 10 grammes of chalk Atomic weight of calcium 40 black powder gives oxygen when heated with sulphuric acid and chlorine when heated with hydrochloric acid What is its composition How would you identify the gases Give the formulae of the principal acids composed of hydrogen sulphur and oxygen Have they all been obtained in the pure state Two shillings are placed in separate vessels containing nitric acid After some hours the one has entirely dissolved to pale blue liquid while the other has been converted into white powder How can you explain this Express in equations the action of hydrochloric acid on sodium nc aluminium and tin respectively An ore of iron is found to contain 724 per cent of metal and 27 per cent of oxygen Give its name and formula Atomic weight of iron 56 Practical Qualitative Analysis for the SambrooJce Exhibition Name the constituents of the simple salts marked By and Note briefly the steps of the analysis in each case י 1' Η Γ 'ώάί