Chromium(II) Hydroxide Concepts

The video tutorial explains how to write the chemical formula for Chromium(II) Hydroxide. It begins by identifying the element symbol for chromium and the significance of the Roman numeral indicating its charge. The tutorial then discusses the hydroxide ion as a polyatomic ion and the importance of balancing charges to form a neutral compound. By using two hydroxide ions, the charges are balanced, resulting in the formula Cr(OH)2. The video concludes with a summary of the steps taken to derive the formula.

What does the Roman numeral II indicate in Chromium(II) Hydroxide?

• The number of chromium atoms

• The atomic number of chromium

• The charge on the chromium ion

• The number of hydroxide ions

Which of the following is a polyatomic ion?

• Na+

• Cr

• H2O

• OH-

What is the charge of the hydroxide ion?

• 2-

• 2+

• 1+

• 1-

Why must the charges in Chromium(II) Hydroxide add up to zero?

• To balance the equation

• To ensure the compound is neutral

• To increase reactivity

• To form a stable ion

How many hydroxide ions are needed to balance the charge of one chromium ion in Chromium(II) Hydroxide?

• Two

• One

• Four

• Three

Why are parentheses used in the formula for Chromium(II) Hydroxide?

• To denote multiple hydroxide ions

• To show the number of chromium atoms

• To indicate the charge of the compound

• To highlight the polyatomic nature

What is the correct chemical formula for Chromium(II) Hydroxide?

• CrOH2

• Cr2OH

• Cr(OH)2

• CrOH