A chemistry teacher is currently focusing on the objective, 'Given chemical compound names, students will write the correct chemical formulas four out of five ×.'

This choice focuses on recognizing the names of elements based on their chemical symbols. While this is an important foundational skill in chemistry, it does not directly address the task of converting compound names into formulas, which is the specific objective outlined in the question.

Classifying compounds as ionic or molecular involves understanding the types of bonds present in a compound but does not involve writing chemical formulas from names. This skill is more about categorization rather than the direct application of translating names into formulas, which is the focus of the objective.

Describing the characteristics of named compounds involves discussing properties such as solubility, reactivity, or physical state. While this knowledge is beneficial, it is not relevant to the objective of converting compound names into their corresponding chemical formulas, which is the main focus of the question.