Valency and Chemical Formulas of Transition Metals

This video tutorial covers the basics of working with transition metals, focusing on how to determine the chemical formulas of compounds like iron chloride, copper sulfide, chromium oxide, and cobalt chloride. The tutorial explains the use of Roman numerals to indicate the valency of transition metals and demonstrates how to combine metals with non-metals to form compounds. Simplification of chemical formulas is also discussed.

What is a key characteristic of transition metals?

• They do not form compounds.

• They have a fixed valency.

• They are always non-metals.

• They are often represented with Roman numerals.

How is the valency of iron(II) indicated in its chemical formula?

• By using a prefix 'di-'.

• By using a negative sign.

• By using a Roman numeral II.

• By using a subscript 2.

What is the chemical formula for iron(II) chloride?

• Fe2Cl3

• FeCl2

• Fe2Cl

• FeCl3

In iron(III) chloride, what does the Roman numeral III indicate?

• The valency of iron.

• The charge of chloride.

• The number of chloride ions.

• The atomic number of iron.

What is the chemical formula for iron(III) chloride?

• FeCl2

• Fe2Cl3

• Fe3Cl

• FeCl3

When simplifying the formula for copper sulfide, what is the result?

• Cu2S2

• CuS

• Cu2S

• CuS2

What is the valency of copper in copper sulfide?

• +1

• +2

• -2

• -1

What is the chemical formula for chromium oxide?

• Cr2O3

• Cr3O2

• CrO3

• CrO2

In cobalt chloride, what does the Roman numeral II indicate?

• The number of chloride ions.

• The charge of chloride.

• The atomic number of cobalt.

• The valency of cobalt.

What is the chemical formula for cobalt chloride?

• CoCl2

• Co2Cl

• CoCl3

• Co2Cl3