Oxidation States and Numbers

The video tutorial explains how to find the oxidation numbers for HBrO3, also known as bromic acid. It begins by identifying the compound as neutral, meaning the oxidation numbers must sum to zero. The tutorial discusses the typical oxidation states of hydrogen, bromine, and oxygen, noting exceptions when bromine is bonded to oxygen. An equation is set up to solve for bromine's oxidation state, resulting in a value of +5. The video concludes by verifying the sum of oxidation numbers equals zero, reinforcing the concept of neutrality in compounds.

What is the oxidation number of a neutral compound?

• It is always positive.

• It is always negative.

• It adds up to zero.

• It is equal to the number of atoms.

What is the typical oxidation state of hydrogen when bonded to non-metals?

• -1

• +2

• +1

• 0

Why is the oxidation state of bromine in HBrO3 not immediately known?

• Because bromine is a metal.

• Because bromine is bonded to oxygen, a very electronegative element.

• Because bromine is always neutral.

• Because bromine is bonded to hydrogen.

What is the oxidation state of oxygen in most compounds?

• +2

• -1

• -2

• 0

How many oxygen atoms are present in HBrO3?

• 4

• 3

• 2

• 1

What is the equation used to find the oxidation number of bromine in HBrO3?

• x + 3(-2) + 1 = 0

• x + 2(-3) + 1 = 0

• x - 2 + 3 = 0

• x + 3(-1) + 1 = 0

What is the oxidation number of bromine in HBrO3 after solving the equation?

• 0

• +3

• +5

• -1

What is the sum of oxidation numbers in a neutral compound like HBrO3?

• It is zero.

• It is equal to the number of atoms.

• It is equal to the charge of the compound.

• It is always positive.

What is the role of electronegative elements like oxygen in determining oxidation states?

• They always have a positive oxidation state.

• They can alter the expected oxidation states of other elements.

• They do not affect oxidation states.

• They always have a neutral oxidation state.

What is the final oxidation number of bromine in HBrO3?

• -1

• +5

• +3

• +1