Halogens and Oxidation Numbers

This video tutorial explains how to determine the oxidation numbers for each element in hydrochloric acid (HCl). It covers the general rules for assigning oxidation numbers, focusing on hydrogen and chlorine. Hydrogen, when bonded to a non-metal like chlorine, has an oxidation number of +1. The video also explains that the sum of oxidation numbers in a neutral molecule like HCl must equal zero. Chlorine, being a halogen, typically has an oxidation number of -1 unless bonded to more electronegative elements like oxygen or fluorine. The tutorial concludes by summarizing these concepts and confirming the oxidation numbers for HCl.

What is the oxidation number of hydrogen when it is bonded to a non-metal?

• 0

• -1

• +2

• +1

Why do the oxidation numbers in HCl add up to zero?

• Because HCl is a gas

• Because HCl is a metal

• Because HCl is a neutral molecule

• Because HCl is an ion

What is the oxidation number of chlorine in HCl?

• 0

• -1

• +1

• +2

Under what condition does chlorine not have an oxidation number of -1?

• When in a solid state

• When in a gaseous state

• When bonded to oxygen or fluorine

• When bonded to hydrogen

Which group do halogens belong to in the periodic table?

• Group 1

• Group 2

• Group 8

• Group 7A or 17

What is the general rule for the oxidation number of halogens?

• Always +2

• Usually -1 unless bonded to more electronegative elements

• Always 0

• Always +1