Oxidation Numbers and Halogens

The video tutorial explains how to determine the oxidation numbers for copper and bromine in copper(II) bromide (CuBr2). It begins by noting that CuBr2 is a neutral compound, meaning the sum of its oxidation numbers is zero. Bromine, a halogen in group 17, has an oxidation number of -1. With two bromine atoms, the total is -2, requiring copper to have an oxidation number of +2 to balance the compound. The video concludes by confirming the oxidation numbers for CuBr2.

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

• It is always positive.

• It is always negative.

• It varies depending on the compound.

• It is zero.

Which group on the periodic table do halogens belong to?

• Group 12

• Group 1

• Group 3

• Group 17

What is the oxidation number of bromine in CuBr2?

• +1

• 0

• -1

• +2

How many bromine atoms are present in CuBr2?

• Three

• Two

• Four

• One

What must be the oxidation number of copper in CuBr2 to balance the compound?

• 0

• +1

• -2

• +2

Why is it important to know the oxidation states of elements in a compound?

• To predict the compound's reactivity.

• To determine the compound's color.

• To calculate the compound's mass.

• To find the compound's melting point.