Question

order the following from hottest to coldest.
images of containers a, b, c, d with particle motion arrows
options: dbac, bdac, cbad, cadb

Explanation:

The kinetic theory of matter states that the hotter a substance is, the more kinetic energy its particles have, and thus the faster and more randomly they move (with greater speed and more chaotic motion, and also, for gases/liquids, the particles are more spread out or have more space between them in some cases, but here the key is the speed and randomness of motion).

Looking at the diagrams:

• Particle motion speed and randomness: The particles with the most rapid and random motion (shortest arrows? Wait, no—wait, actually, in terms of kinetic energy, faster - moving particles (longer arrows? Wait, no, maybe the length of the arrows represents speed? Wait, no, actually, when particles are hotter, they move faster and more randomly. Let's analyze each:

• Option C: The particles seem to be moving the fastest (short, quick - looking arrows, more random? Wait, maybe the length of the arrow is inversely related? Wait, no, let's think again. In general, for thermal energy, the higher the temperature, the greater the average kinetic energy of the particles, so they move faster (longer arrows would indicate faster speed? Or shorter? Wait, maybe the arrows represent the velocity vectors. So longer arrows mean higher speed. Wait, no, maybe the opposite. Wait, let's look at the options.

Wait, the correct order from hottest to coldest is determined by the speed of particle motion (higher speed = hotter). Let's analyze each diagram:

• Diagram B: The arrows are the longest, meaning particles are moving the fastest (hottest).
• Diagram D: Arrows are longer than A and C, so next.
• Diagram A: Arrows are shorter than D, so next.
• Diagram C: Arrows are the shortest, particles moving slowest (coldest).

So the order from hottest to coldest is B, D, A, C → BDAC.

Answer:

B. BDAC