1. Define an oxidation number.
2. What is the usual oxidation number of oxygen? Of hydrogen?
3. What is the sum of all the oxidation numbers in any compound?
4. Explain the difference between CoCl2 · 6H2O and anhydrous cobalt chloride.
Answers
Answer:
1) a number assigned to an element in chemical combination which represents the number of electrons lost (or gained, if the number is negative), by an atom of that element in the compound
2) The oxidation state of oxygen in its compounds is -2, except for peroxides like H2O2, and Na2O2, in which the oxidation state for O is -1. The oxidation state of hydrogen is +1 in its compounds, except for metal hydrides, such as NaH, LiH, etc., in which the oxidation state for H is -1.
3)Anthony F. Since neutral compounds have no charge, the sum of the oxidation numbers of all the elements in the compound is zero. The oxidation number for an element expresses the oxidation state of that element
4) What is the difference between CoCl2 * 6H2O and anhydrous cobalt chloride? CoCl2 * 6H2O has water in it. Also, anhydrous means "no water