CHEMISTRY · Subjective · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
Two particulate diagrams are provided.
• Diagram I depicts solid NaCl in water showing separate Na+ and Cl− ions dispersed among H2O molecules.
• Diagram II depicts molten NaCl in which Na+ and Cl− ions remain in close contact within a fluid, ion-rich phase but no water molecules are present.
For each diagram, classify the process (dissolving or melting) as a physical change, a chemical change, or both, and justify your classification based on the bonding interactions shown.