Calendar: 1880-1881 Page 689

CLOTH WORKERS SCIENCE EXHIBITION 689 Describe some of the plants which are found in the coal measures 10 After deep well had been sunk four fossils viz Inoceramus sulcatus Belemnitella mucronata Terebratula sella and Terebratulina striatula were discovered in the adjacent heap of excavated soil In what part of our country was the well situated through what geological formations did it pass and in what order were the four fossils brought Hp to the surface of the ground VIIL-Ci trp What would be observed on immersing burning taper in mixture of two measures of nitrogen and one measure of oxygen If hydrogen were substituted for nitrogen in the fore- going experiment what difference would it make in the result Name the chemical compounds which contain sulphur and oxygen only and state what weight of each element is contained in 100 parts of each compound Three bottles without labels are believed to contain sulphuric hydrochloric and nitric acids How would you distinguish between them What is the special feature of the processes for ex- tracting zinc from its ores Enumerate some of the useful purposes to which this metal is applied Write the chemical equation which expresses the action of sulphuric acid upon mixture of common salt and black oxide of manganese Mention one or more gases which take fire spontaneously in air and state briefly how they are obtained 100 measures of dilute hydrochloric acid are found to neutralise 10 grs of pure sodium carbonate Another 100 measures having been employed to absorb ammonia gas now neutralise only grs of sodium carbonate What weight of ammonia had been absorbed by the acid χ χ