Oxidation States in Lithium Dichromate

This video tutorial explains how to determine the oxidation number of chromium in lithium dichromate (Li2Cr2O7). It begins by noting that lithium dichromate is a neutral compound, meaning the sum of oxidation numbers equals zero. Lithium, being in group one, has a +1 charge, while oxygen typically has a -2 charge. The video sets up an equation to solve for chromium's oxidation number, which is found to be +6. An alternative method using the dichromate ion's charge is also mentioned.

What is the overall charge of lithium dichromate?

• Variable

• Negative

• Positive

• Neutral

What is the oxidation state of lithium in lithium dichromate?

• +2

• +1

• -1

• 0

Which element's oxidation state is unknown in lithium dichromate?

• Lithium

• Hydrogen

• Chromium

• Oxygen

What is the typical oxidation state of oxygen in compounds?

• -1

• -2

• 0

• +1

How many oxygen atoms are present in lithium dichromate?

• 8

• 5

• 6

• 7

What is the equation used to solve for chromium's oxidation number?

• 2x - 14 = 0

• 2x + 12 = 0

• 2x + 14 = 0

• 2x - 12 = 0

What is the oxidation number of chromium in lithium dichromate?

• +3

• +6

• +5

• +4

What is the charge of the dichromate ion?

• 1+

• 2+

• 1-

• 2-

Which method is considered the easiest to find the oxidation number of chromium?

• Using the equation setup

• Using the periodic table

• Using trial and error

• Using the dichromate ion's charge