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:

Chemical change involves bond - breaking and new substance formation (I). Physical change has no bond - breaking, same substance, and is reversible (III).

Answer:

A. I & III