Oxidation Numbers and Compounds

The video tutorial explains how to determine the oxidation numbers for each element in sodium bromate (NaBrO3). It begins by noting that NaBrO3 is a neutral compound, meaning the oxidation numbers must sum to zero. Sodium, being in group 1, has an oxidation number of +1. Bromine, typically -1 in group 17, is bonded to oxygen, so its oxidation number is unknown and labeled as x. Oxygen generally has an oxidation number of -2. An equation is set up to solve for bromine's oxidation number, resulting in a value of +5. The video concludes by verifying that the sum of oxidation numbers equals zero.

What is the overall charge of sodium bromate (NaBrO3)?

• Neutral

• Variable

• Negative

• Positive

Which group in the periodic table does sodium belong to?

• Group 18

• Group 1

• Group 2

• Group 17

What is the typical oxidation number for elements in Group 1?

• -1

• 0

• +2

• +1

Under what condition does bromine not have a -1 oxidation state?

• When bonded with chlorine

• When in its elemental form

• When bonded with hydrogen

• When bonded with oxygen

What is the oxidation number of oxygen in most compounds?

• -2

• -1

• 0

• +2

How many oxygen atoms are present in sodium bromate (NaBrO3)?

• 4

• 1

• 2

• 3

What is the oxidation number of bromine in NaBrO3?

• +3

• +5

• 0

• -1

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

• Zero

• Always negative

• Always positive

• Depends on the compound

What is the purpose of verifying the sum of oxidation numbers in a compound?

• To ensure the compound is stable

• To confirm the compound's neutrality

• To find the compound's molecular weight

• To determine the compound's reactivity