6. Chemical Quantities & Aqueous Reactions

In an oxidation-reduction (redox) reaction, what does an atom gain or lose to change its oxidation number?

In which of the following compounds does nitrogen have an oxidation number of -3?

What is the oxidation state of chromium in K2Cr2O7?

What is the oxidation number of sulfur (S) in the compound Na2SO4?

What is the oxidation state of chromium (Cr) in K2Cr2O7?

What is the bond order of the phosphorus-oxygen (P–O) bond in the phosphate ion, PO_4^{3-}?

What is the oxidation state of sulfur in the ion SO_4^{2-}?

Which of the following statements is false when referring to the oxidation state of carbon?

What is the sum of the oxidation numbers of all atoms in a neutral molecule of magnesium sulfate (MgSO_4)?

In the compound NH3, what is the oxidation number of nitrogen?

What is the oxidation state of carbon in Al2(CO3)3?

What is the effective nuclear charge (Z_{eff}) experienced by a valence electron in an oxygen atom?

What is the oxidation number of Mg in MgO?

In which of the following compounds does oxygen have an oxidation number other than -2?

What is the oxidation state of sulfur in the sulfate ion, SO_4^{2-}?