Question

look at the key and four images below.
answer the reflection question, and explain your response.
key: molecule speed
a.
hot water
cold water
b.
hot water
cold water
c.
hot water
cold water
d.
hot water
cold water
which image shows the difference between the speed of molecules in hot and cold water?
(check one) (hint: refer to the key above the images.)
a b c d
explain your answer choice.

thermal energy—lesson 1.3—activity 3

Explanation:

Molecules in hot water have higher thermal energy, so they move faster (represented by more spread-out, less dense arrangement in the image), while cold water molecules move slower (more tightly packed, denser arrangement). Option B correctly shows hot water with a more spread-out molecular pattern and cold water with a tight, dense pattern matching the key's molecule speed indicator.

Answer:

B. Hot Water (spread-out molecules) / Cold Water (tight, dense molecules)