Oxidation States and Ion Charges

The video tutorial explains how to find the oxidation number of chromium in the ion CrOH4-. It begins by noting the ion's negative charge and explains that the sum of oxidation numbers equals this charge. The tutorial details the oxidation states of oxygen and hydrogen, and sets up an equation to solve for chromium's oxidation state, which is determined to be +3. The video concludes by summarizing the process and confirming the oxidation numbers add up to the ion's charge.

What is the overall charge of the Cr(OH)4- ion?

• +1

• -1

• -2

• 0

What is the oxidation state of oxygen in most compounds?

• +1

• -1

• -2

• +2

When hydrogen is bonded to a non-metal, what is its typical oxidation state?

• -1

• +2

• +1

• 0

In the equation set up to find chromium's oxidation number, what is the sum of the oxidation states of oxygen and hydrogen?

• +1

• -1

• -4

• -3

What is the oxidation number of chromium in Cr(OH)4-?

• +5

• +4

• +3

• +2

How do you verify the oxidation numbers in a compound like Cr(OH)4-?

• By checking if they add up to zero

• By ensuring they add up to the ion's charge

• By comparing with a periodic table

• By using a calculator

What is the significance of the negative sign in Cr(OH)4-?

• It indicates a positive ion

• It shows the compound is neutral

• It has no significance

• It represents the ion's charge