Chromium Compounds and Ionic Charges

The video tutorial explains how to write the formula for chromium 2 chloride by examining the periodic table to identify the element symbols and charges. It discusses the ionic nature of the compound, the significance of the Roman numeral indicating chromium's charge, and the use of the crisscross method to balance the charges. The tutorial concludes by verifying the formula and ensuring the charges add up to zero, resulting in the correct formula: CrCl2.

What is the element symbol for chromium?

• Cr

• Cl

• Cm

• Ch

Which type of compound is formed between a metal and a non-metal?

• Covalent

• Ionic

• Metallic

• Hydrogen

What is the ionic charge of chromium in chromium 2 chloride?

• 1-

• 1+

• 2+

• 2-

What is the ionic charge of chlorine in chromium 2 chloride?

• 2-

• 1-

• 2+

• 1+

What method is used to balance the charges in chromium 2 chloride?

• Elimination

• Substitution

• Cross-multiply

• Crisscross

How many chlorine atoms are needed to balance the charge of one chromium atom in chromium 2 chloride?

• 4

• 2

• 1

• 3

What is the final formula for chromium 2 chloride?

• CrCl

• CrCl2

• Cr2Cl

• Cr2Cl3

Why is it important to verify the formula of chromium 2 chloride?

• To determine the melting point

• To check the color of the compound

• To ensure the charges are balanced

• To find the atomic mass