High School Chemistry . e symbol is that derived from theLatin word. Iron, copper, silver, mercury, potassium,serve as examples of this. 5. Atomic Weights.—By atomic weight of an elementis meant the number of times that an atom of the sub-stance is heavier than an atom of hydrogen. Of courseit would be absurd to think of weighing out an atom ofany substance and comparing its weight with that of anatom of hydrogen. The pupil must understand thatthese numbers have been derived from the results of a ATOMIC WEIGHTS. 21 long series of difficult experiments, which he can notcomprehend at the present
High School Chemistry . e symbol is that derived from theLatin word. Iron, copper, silver, mercury, potassium,serve as examples of this. 5. Atomic Weights.—By atomic weight of an elementis meant the number of times that an atom of the sub-stance is heavier than an atom of hydrogen. Of courseit would be absurd to think of weighing out an atom ofany substance and comparing its weight with that of anatom of hydrogen. The pupil must understand thatthese numbers have been derived from the results of a ATOMIC WEIGHTS. 21 long series of difficult experiments, which he can notcomprehend at the present stage. Any other element might be adopted as the unit foratomic weight instead of hydrogen ; and if this weredone the atomic weights of all the other elements wouldbe relatively changed. 6.—Questions and Exercises. I. Take a piece of roll sulphur and of iron or copper wire ; holdthem, one in each hand, and dip them into a vessel containingboiling water. Note the one along which the heat travels quickestto the Fig. 4. 2. Insert these same substances, in turn, into the circuit of agalvanic battery. Attach a galvanometer to the circuit, as in , and by its aid note which substance acts as a conductor ofelectricity. A toy compass will do for the galvanometer. 3. Compare the surface appearance of copper, silver, and othermetals with that of sulphur and phosphorus. 4. Connect a galvanometer into a battery circuit, then cut thecircuit and dip the cut ends of the wire into a vessel of mercury. 5. What have you noticed which would aid you in classifyingmercury as a metal or non-metal. For basis of theory of elements, see H. S. Physical Science. For articles on metals and non-metals, see Miiir & Slateis ElementaryChemistry, p. 99; Tildens Chem. Phil., pp. 244-256; Roscoe & Schor-lemmer, vol. I., pp. 53-4 ; Richter, p. 253 ; Remsen, Inorganic Chem., ; D. <fe W., 12. 22 COMPOSITION OF WATER. CHAPTER V. 1 .—To Find out if Water is an Element. Experiments. I. Ta
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