Oxidation Numbers in Calcium Phosphate

The video tutorial explains how to determine the oxidation numbers for each element in calcium phosphate (Ca3(PO4)2). It begins by introducing the concept of oxidation numbers and the importance of knowing that the compound is neutral. The video then discusses the oxidation numbers for calcium, phosphorus, and oxygen, setting up an equation to find the unknown oxidation number for phosphorus. By solving the equation, it is determined that phosphorus has an oxidation number of +5. The tutorial concludes with a summary of the findings.

What is the main focus of the video?

• Finding the oxidation numbers for elements in calcium phosphate

• Explaining the periodic table

• Describing the properties of metals

• Discussing chemical reactions

What is the oxidation number of calcium in calcium phosphate?

• +2

• -2

• +1

• 0

Why is the compound considered neutral?

• Because it has a positive charge

• Because it has a negative charge

• Because all oxidation numbers add up to zero

• Because it contains only non-metals

What is the oxidation number of oxygen in calcium phosphate?

• 0

• +2

• -1

• -2

How is phosphorus represented in the equation?

• As a variable x

• As a negative number

• As a constant

• As a known value

How many calcium atoms are considered in the equation setup?

• Four

• Three

• One

• Two

What is the total number of oxygen atoms in the compound?

• Six

• Ten

• Four

• Eight

What is the oxidation number of phosphorus in calcium phosphate?

• +3

• +4

• +5

• +6

How many phosphorus atoms are there in the compound?

• Three

• One

• Two

• Four

What is the final conclusion of the video?

• The oxidation number of oxygen is +2

• The oxidation number of phosphorus is +5

• The oxidation number of calcium is -2

• The compound is positively charged