Chlorine and Phosphorus Compounds

The video tutorial explains how to find the oxidation numbers for each element in phosphorus pentachloride (PCl5). It begins by noting that PCl5 is a neutral compound, meaning the oxidation numbers must sum to zero. Chlorine, being in group 17, typically has an oxidation number of -1. With five chlorine atoms, the total is -5, requiring phosphorus to have an oxidation number of +5 to balance the compound. The tutorial concludes by verifying the calculations.

What is the overall charge of PCl5?

• Neutral

• Negative

• Positive

• Depends on the environment

Which group does chlorine belong to in the periodic table?

• Group 1

• Group 17

• Group 3

• Group 15

What is the typical oxidation number for chlorine in PCl5?

• 0

• +1

• +5

• -1

How many chlorine atoms are present in PCl5?

• 4

• 6

• 5

• 3

What must be the oxidation number of phosphorus in PCl5 to balance the compound?

• +5

• +3

• -3

• -5

What is the sum of the oxidation numbers in a neutral compound like PCl5?

• 5

• 10

• 0

• -5