This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
ScanSolve AI Answer
A chemical change results in the formation of new substances with different chemical properties. A physical change alters the form or appearance of a substance but does not change its chemical composition. Let's examine each statement: A. Table salt dissolves readily in water. When table salt (NaCl) dissolves in water, it separates into ions (Na^+ and Cl^-), but it is still chemically table salt. The salt can be recovered by evaporating the water. This is a physical change. B. Steel rusts when exposed to moist air. Rusting is the process where iron (a component of steel) reacts with oxygen and water to form iron oxides (rust). This creates a new substance with different chemical properties. This is a chemical change. C. Ice cream melts when taken out of the freezer. Melting is a change of state from solid to liquid. The chemical composition of the ice cream remains the same. This is a physical change. D. Solid iodine, when heated rapidly, changes to a gas without melting. This process is called sublimation, which is a change of state from solid directly to gas. The chemical identity of iodine (I_2) does not change. This is a physical change. Therefore, the statement that describes a chemical change is B. The final answer is B. 3 done, 2 left today. You're making progress.