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action acts alchemists alloys aluminum chloride ammonia ammonia gas ammonium apparatus atomic weight battery bleaching blue bottle burn c.c. of water calcium called camphor carbon dioxide cell cent CHAPTER chemistry chemists chieﬂy color combine cone contains copper crucible crystals decomposed delivery tube double decomposition dry plate electricity elements equation experiment explosive fertilizers ﬁll ﬁlled ﬁlm ﬁnally ﬁnd ﬁne ﬁre ﬁrst ﬂame ﬂask formed formula gases glass tube gold grams gunpowder hard water heat hence hydrochloric acid hydrogen sulphide hydroxide inch iron kind known lead light liquid manganese melted mercury metals mixed mixture negative nickel nitric acid nitrogen oxide oxygen paper phosphoric acid phosphorus piece plant potash potassium chlorate potassium nitrate powder precipitate rubber salt shown in Fig silver bromide silver chloride soap sodium nitrate soil solution steel substance sulphate sulphur dioxide sulphuric acid synthetic test tube things valence zinc