id author title date pages extension mime words sentences flesch summary cache txt 20848 Henderson, William Edwards An Elementary Study of Chemistry .txt text/plain 121982 10269 71 prepared from compounds known as acids, all of which contain hydrogen. the oxygen present in the copper oxide to form water, which is absorbed hydrogen and oxygen combine in two different ratios to form water and Similarly, the element iron combines with oxygen to form two oxides, one sulphuric acid two compounds are formed, namely, hydrogen dioxide acid to water in the preparation of oxygen and hydrogen by electrolysis the oxides of most metals, forming a salt and water. DEFINITION: _Any oxide which will combine with water to form an acid, or acid, called sulphides, form an important class of salts. of hydrogen to form acids, which are gases very soluble in water. oxygen and hydrogen to form four different acids. a base is present in the water, salts of carbonic acid are formed, and carbon unites with nitrogen and hydrogen to form the acid HCN, called ./cache/20848.txt ./txt/20848.txt