Chromium and Oxygen Chemistry Concepts

The video tutorial explains how to write the formula for chromium(III) oxide. It begins by identifying the element symbols for chromium and oxygen, noting that chromium is a transition metal with a 3+ charge and oxygen is a non-metal with a 2- charge. The tutorial describes the ionic nature of the compound and the need for charges to balance to zero. The crisscross method is introduced to simplify the balancing process, resulting in the formula Cr2O3. The video concludes by verifying the formula through charge calculations, ensuring a net charge of zero.

What is the element symbol for chromium?

• Ch

• Cm

• Cr

• Co

What charge does chromium have in chromium 3 oxide?

• 4+

• 1+

• 3+

• 2+

Which group is oxygen in on the periodic table?

• Group 18

• Group 16

• Group 14

• Group 12

What is the charge of oxygen in ionic compounds?

• 2-

• 1-

• 3-

• 4-

What method is used to balance the charges in chromium 3 oxide?

• Addition method

• Substitution method

• Crisscross method

• Cross-multiplication

What is the formula for chromium 3 oxide?

• CrO2

• Cr3O2

• CrO3

• Cr2O3

What is the net charge of chromium 3 oxide?

• -1

• +2

• 0

• +1