Oxidation Numbers in Compounds

The video tutorial explains how to determine the oxidation numbers for elements in barium chromate (BaCrO4). It starts by noting that the compound is neutral, meaning the oxidation numbers must sum to zero. Barium, being in group 2, has a +2 oxidation number. Chromium, a transition metal, has an unknown oxidation number, denoted as x. Oxygen typically has a -2 oxidation number. By setting up an equation, the video shows that chromium's oxidation number is +6. The tutorial concludes by verifying that the sum of oxidation numbers equals zero, confirming the compound's neutrality.

What is the oxidation number of barium in BaCrO4?

• +1

• +2

• +4

• +3

Why is the oxidation number of chromium in BaCrO4 initially unknown?

• Chromium is always +3.

• Chromium is a transition metal with variable oxidation states.

• Chromium is a non-metal.

• Chromium is a noble gas.

What is the typical oxidation number of oxygen in compounds?

• -1

• +2

• 0

• -2

How many oxygen atoms are present in BaCrO4?

• 4

• 2

• 5

• 3

What equation is set up to find the oxidation number of chromium in BaCrO4?

• x + 2 = 0

• x - 6 = 0

• x + 6 = 0

• x - 8 = 0

What is the oxidation number of chromium in BaCrO4?

• +5

• +4

• +7

• +6

Why do the oxidation numbers in BaCrO4 add up to zero?

• Because it is a neutral compound.

• Because it is an ionic compound.

• Because it is a covalent compound.

• Because it is a charged compound.