topic four chemistry

• moles = conc x vol
• oxygen has an oxidation number of -2
• hydrogen has an oxidation number of +1
• fluorine has an oxidation number of -1
• na + has an oxidation number of +1
• k+ has an oxidation number of +1
• mg2+ has an oxidation number of +2
• ca2+ has an oxidation number of 2+
• cl- has an oxidation number of -1
• br- has an oxidation number of -1
• I- has an oxidation number of -1
• hydrogen in metal hydrides such as NaH has an oxidation number of -1
• oxygen in oxygen peroxides , I.e h2o2 has an oxidation number of -1
• oxygen bonded to fluorine has an oxidation number of 2+
• dilute acids undergo redox reactions with some metals to produce salts and hydrogen