Lesson-specific diagram for Reaction and stoichiometry mastery. It visualizes the reasoning sequence tied to $\text{equation}\to\text{ratio}\to\text{quantity}\to\text{interpretation}$. Text alternative: Choose a balanced reaction, solve quantitatively with significant figures, and evaluate whether the result is chemically and physically plausible. Choose a representation that matches the chemical scale and evidence; do not infer more precision or mechanism than the data support.