Oxidation Numbers and Molybdate Ion

The video tutorial explains how to determine the oxidation numbers for elements in the molybdate ion (MoO4^2-). It begins by discussing the ionic charge and the rule that oxidation numbers in an ion add up to the ion's charge. The tutorial then focuses on calculating the oxidation numbers, particularly for molybdenum, a transition metal with variable oxidation states. By assigning oxygen a typical oxidation number of -2 and solving for molybdenum, the video demonstrates that molybdenum's oxidation number is +6.

What is the charge of the molybdate ion?

• 1-

• 2-

• 2+

• 1+

How do oxidation numbers in an ion relate to the ion's charge?

• They are always zero.

• They add up to the charge of the ion.

• They are equal to the number of atoms.

• They are always positive.

What is the typical oxidation number for oxygen in compounds?

• +1

• -1

• -2

• +2

How many oxygen atoms are present in the molybdate ion?

• 4

• 3

• 2

• 5

What is the oxidation number of molybdenum in the molybdate ion?

• +5

• +7

• +6

• +4

Which element in the molybdate ion can have multiple oxidation states?

• Oxygen

• Molybdenum

• Hydrogen

• Nitrogen

What is the final step in calculating the oxidation number of molybdenum in the molybdate ion?

• Solving for x in the equation

• Subtracting the charge of the ion

• Multiplying the oxidation numbers

• Adding the oxidation numbers of oxygen