Understanding Charges and Compounds

This video tutorial explains how to interpret ionic compounds, focusing on cases involving polyatomic ions and transition metals. It highlights the challenge of determining the charge of transition metals, using examples with iron cyanide and nickel hydroxide. The video demonstrates how to use a polyatomic ion chart to identify ions and apply the reverse crisscross rule to deduce the charge of transition metals, which is then communicated using Roman numerals in the compound's name.

What makes interpreting ionic compounds with transition metals challenging?

• They do not form compounds.

• They have fixed charges.

• They can have multiple charges.

• They are always positively charged.

How can you identify a polyatomic ion in a chemical formula?

• It contains only metals.

• It has a positive charge.

• It contains more than one nonmetal.

• It is always a single element.

What is the charge of a cyanide ion?

• Negative 2

• Positive 2

• Negative 1

• Positive 1

How do you determine the charge of iron in a compound with cyanide?

• By checking the periodic table

• By assuming it is always +3

• By using the reverse crisscross rule

• By assuming it is always +2

Why are Roman numerals used in naming compounds with transition metals?

• To show the charge of the metal

• To denote the number of bonds

• To indicate the number of atoms

• To represent the atomic mass

What does the Roman numeral in a compound name indicate?

• The total charge of the compound

• The charge of the transition metal

• The number of nonmetals present

• The number of atoms in the compound

What is the chemical formula for nickel hydroxide?

• NiOH

• Ni(OH)2

• Ni2OH

• NiOH2

How do you determine the combination ratio of nickel and hydroxide?

• By assuming a 1:2 ratio

• By balancing the charges

• By using the periodic table

• By using the atomic mass

What is the charge of hydroxide ion?

• Negative 2

• Positive 1

• Positive 2

• Negative 1

Why is it important to know the charge of a transition metal in a compound?

• To determine the color of the compound

• To predict the compound's reactivity

• To correctly name the compound

• To find the compound's melting point