Oxidation Numbers and Compound Charges

This video tutorial explains how to determine the oxidation numbers for gold in the compound KAu(CN)2, known as potassium dicyanourate. It begins by identifying the compound as neutral, meaning the oxidation numbers sum to zero. Potassium, a group one element, has a known oxidation number of +1. The video then addresses the cyanide ion (CN), which has a -1 charge. By setting up an equation, the oxidation number for gold is determined to be +1. The tutorial concludes with a brief mention of finding oxidation numbers for carbon and nitrogen, and offers additional resources for further learning.

What is the nature of the compound KAu(CN)2?

• It is a negatively charged compound.

• It is a neutral compound.

• It is a compound with variable charge.

• It is a positively charged compound.

What is the oxidation number of potassium in KAu(CN)2?

• -1

• +2

• +1

• 0

What is the charge of the cyanide ion in KAu(CN)2?

• -2

• -1

• 0

• +1

How do the oxidation numbers in a neutral compound like KAu(CN)2 add up?

• They add up to +2.

• They add up to +1.

• They add up to -1.

• They add up to 0.

What equation is set up to find the oxidation number of gold in KAu(CN)2?

• x - 1 = 0

• 1 + x - 2 = 0

• 1 + x + 2 = 0

• x + 1 = 0

What is the oxidation number of gold in KAu(CN)2?

• +1

• +2

• 0

• +3

What is the total sum of oxidation numbers in KAu(CN)2?

• 0

• +1

• -1

• +2

What additional information is provided for finding oxidation numbers of carbon and nitrogen?

• A link to a video tutorial.

• A link to a textbook.

• A link to a website.

• A link to a research paper.

Why is finding the oxidation number of carbon and nitrogen considered tricky?

• Because they have high atomic numbers.

• Because they have similar electronegativities.

• Because they are noble gases.

• Because they are transition metals.

Who is the presenter of the video?

• Dr. A

• Dr. B

• Dr. D

• Dr. C