Question

i. a chemical change breaks bonds, forms new substances and is irreversible. ii. reordering the intermolecular forces is indicative of a chemical change. iii. during a physical change the substance remains the same, no bonds are broken, and the process is reversible. iv. permanently altering the makeup of the substance is characteristic of a physical change. which conclusion(s) best elaborate(s) on the difference(s) between a chemical change and a physical change? a i & iii b ii & iv c iii & ii d iv & i

Explanation:

1. Analyze Statement I: A chemical change involves bond breaking, new substance formation, and is irreversible. This is correct as chemical changes (e.g., combustion) create new substances and are often irreversible.
2. Analyze Statement II: Reordering intermolecular forces is a physical change (e.g., phase change like melting), not chemical. So II is incorrect.
3. Analyze Statement III: Physical change (e.g., dissolving, phase change) keeps the substance the same, no bond breaking, and is often reversible. This is correct.
4. Analyze Statement IV: Permanently altering substance makeup is chemical change, not physical. So IV is incorrect.

Only I and III are correct.

Answer:

A. I & III