Understanding Chromium and Nitrite Ions

The video tutorial explains how to find the oxidation number for chromium in chromium nitrite. It starts by identifying the compound as neutral, meaning all oxidation numbers must sum to zero. Chromium, a transition metal, can have various oxidation numbers based on its bonds. Here, it bonds with two nitrite ions, each with a -1 charge. The tutorial demonstrates that the oxidation number for chromium must be +2 to balance the charges. The video concludes with a reference to additional resources for finding oxidation numbers in other ions.

What does the absence of a charge sign after chromium in chromium(II) nitrate indicate?

• The compound is positively charged.

• The compound is neutral.

• The compound is negatively charged.

• The compound is a gas.

Why can chromium have different oxidation numbers?

• Because it is a non-metal.

• Because it is an alkali metal.

• Because it is a transition metal.

• Because it is a noble gas.

What is the ionic charge of the nitrite ion?

• -1

• +1

• +2

• 0

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

• They add up to zero.

• They are always negative.

• They add up to the ion's charge.

• They are always positive.

What must the oxidation number of chromium be in chromium(II) nitrate for the compound to be neutral?

• +3

• +1

• +2

• +4

What is the significance of the 'II' in chromium(II) nitrate?

• It indicates the number of nitrate ions.

• It indicates the charge of the compound.

• It indicates the oxidation number of chromium.

• It indicates the number of chromium atoms.

Where can you find additional help for determining the oxidation number of nitrogen in the nitrite ion?

• In the video description.

• In the periodic table.

• In the appendix.

• In the textbook.