Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
Transition elements are the collection of metallic elements located in the center of the Periodic Table, specifically in the d-block between Groups 2 and 13.
Physical properties include high density, high melting points, and being hard and strong compared to Group 1 and 2 metals.
Chemical properties distinct to transition metals include variable oxidation states (e.g., and ), the formation of colored compounds, and acting as catalysts.
Transition metals form colored ions in solution. For example, ions typically appear blue, while ions appear green.
Catalytic activity is a key industrial application. For instance, Iron () is used in the Haber process to synthesize , and Vanadium(V) oxide () is used in the Contact process.
Unlike Group 1 metals, transition metals are relatively unreactive with water and oxygen at room temperature, making them useful construction materials.
📐Formulae
💡Examples
Problem 1:
Identify which of the following elements is a transition metal based on its properties: Sodium (), Iron (), or Calcium (). Provide two reasons for your choice.
Solution:
Iron () is the transition metal.
Explanation:
Sodium () is an alkali metal and Calcium () is an alkaline earth metal. Iron () is a transition metal because it can form ions with different charges such as and , and it acts as a catalyst in industrial reactions like the Haber process.
Problem 2:
A student adds sodium hydroxide solution, , to an unknown solution containing transition metal ions. A blue precipitate forms. Identify the ion present and write the ionic equation for the reaction.
Solution:
The ion present is . The ionic equation is:
Explanation:
Transition metal ions produce characteristic colored precipitates with hydroxide ions. A blue precipitate specifically indicates the presence of Copper(II) ions, forming Copper(II) hydroxide.