Oxidation States and Barium Peroxide

The video tutorial explains how to determine the oxidation numbers for each element in barium peroxide (BaO2). It begins by discussing the rules for oxidation numbers in neutral compounds, emphasizing that they sum to zero. Barium, being in group two, has a +2 oxidation number. Oxygen typically has a -2 oxidation number, but in peroxides like BaO2, it is different. The video sets up an equation to solve for the oxidation number of oxygen, concluding that it is -1 in BaO2. The tutorial ends with a summary and thanks to the viewers.

What is the oxidation number of barium in barium peroxide?

• +1

• +2

• -2

• 0

Why do the oxidation numbers in a neutral compound add up to zero?

• Because the compound is charged

• Because the compound is neutral

• Because the compound is stable

• Because the compound is reactive

What is the usual oxidation state of oxygen?

• +2

• -1

• -2

• 0

In which cases does oxygen not have an oxidation state of -2?

• In all compounds

• When in water

• When combined with hydrogen

• In peroxides and with fluorine

What variable is used to represent the unknown oxidation number of oxygen in the equation?

• x

• w

• z

• y

How many oxygen atoms are considered in the equation for barium peroxide?

• One

• Two

• Four

• Three

What is the oxidation number of oxygen in barium peroxide?

• -2

• -1

• +1

• 0

What is the final step in solving the oxidation number of oxygen in barium peroxide?

• Multiplying both sides of the equation by two

• Dividing both sides of the equation by two

• Subtracting the oxidation numbers

• Adding the oxidation numbers