When pentane (C5H12) mixes with heptane (C7H16), what type of intermolecular forces must be broken? What type of attractive forces are formed?

A) Dipole-dipole; dispersion
B) Dipole-dipole; Dipole-dipole
C) Dispersion; Dipole-dipole
D) Dispersion; dispersion

D) Dispersion; dispersion

Explanation:

Pentane or heptane are non-polar molecules so both of the , dispersion or london force exists as intermolecular force exists among molecules of pentane or heptane . So these bonds needs to be broken and dispersion  interaction takes place between molecules of pentane and heptane. Dispersion interaction  of AB type is stronger than AA or BB type.

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants