An Experimental Course of Chemistry for Agricultural Students
An Experimental Course of Chemistry for Agricultural Students
Thomas Southall Dymond
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Explain the power possessed by wood charcoal of absorbing gases. Describe experiments which show its porosity and absorptive power. How does this explain the use of charcoal as a deodoriser and disinfectant? What relation exists between the condensibility of gases, their solubility, and their absorption by charcoal ? 162. What is marsh gas, and how is it produced in nature? Explain the danger of "fire-damp" in coal mines. What is meant by "destructive distillation, " and from what substances ca...n impure marsh gas be produced by this means ? *i63. Determine the percentage of ash in the charcoal. *i64. Determine the percentage increase of weight of wood charcoal (previously heated to redness in a tube) on exposure to air. QUESTIONS AND PROBLEMS 129 "165. Identify the solids. (Powdered charcoal, black oxide of manganese, and black oxide of copper. ) The Oxides of Carbon. 166. Describe the method of preparation of carbonic acid gas. Explain why carbonates are decomposed by hydrochloric acid.
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