Question

order the following from hottest to coldest.
a b c d
four boxes with particle motion diagrams
options: dbac, cabd, cdab, dcab

Explanation:

To order from hottest to coldest, we analyze the particle motion: hotter substances have particles with more kinetic energy (faster, more random motion), colder have less (slower, more ordered or restricted).

• D: Particles have long, fast - moving (high kinetic energy) random motion.
• B: Particles move relatively fast with moderate - length vectors.
• A: Particles have shorter vectors than B, so less kinetic energy.
• C: Particles have the slowest, most restricted motion (shortest vectors, least random).

So the order from hottest to coldest is D (hottest) → B → A → C (coldest), which is DBAC.

Answer:

A. DBAC