(c) Substance \( P \) undergoes physical and chemical changes. Which two of the following are physical changes? Explain your answer. A Substance \( P \) reacts with concentrated sulfuric acid. B lodine forms when chlorine is added to an aqueous solution of substance \( P \). C Substance \( P \) boils at \( 1330^{\circ} \). D Substance \( P \) dissolves easily in water.

To determine which two of the options represent physical changes, we need to understand the difference between physical and chemical changes: - **Physical changes** involve changes in the state or appearance of a substance without altering its chemical composition. Examples include changes in state (like melting or boiling), dissolving, and changes in shape or size. - **Chemical changes** involve a transformation that alters the chemical composition of the substance, resulting in the formation of new substances. This typically includes reactions where bonds are broken and formed. Now, let's analyze the options: A. **Substance \( P \) reacts with concentrated sulfuric acid.** - This is a chemical change because a reaction occurs, likely resulting in new substances being formed. B. **Iodine forms when chlorine is added to an aqueous solution of substance \( P \).** - This is also a chemical change because the formation of iodine indicates a chemical reaction has taken place, resulting in new substances. C. **Substance \( P \) boils at \( 1330^{\circ} \).** - This is a physical change because boiling is a change in the state of the substance from liquid to gas, without altering its chemical composition. D. **Substance \( P \) dissolves easily in water.** - This is a physical change as well because dissolving is a process where the substance disperses in a solvent (water in this case) but retains its chemical identity. Based on this analysis, the two physical changes are: - **C. Substance \( P \) boils at \( 1330^{\circ}** (change of state). - **D. Substance \( P \) dissolves easily in water** (change in physical state, not chemical composition).