After rain, Jamal saw a puddle; by afternoon it disappeared from view—where are the water particles now?
- The particles still exist but moved into the air as gas. (correct answer)
- The particles turned into nothing when the puddle dried up.
- The particles were destroyed, so they no longer exist anywhere.
- The particles became air particles, so the water stopped existing.
Explanation: This question tests understanding that particles of matter still exist even when matter appears to disappear from view (NGSS 5-PS1-1). Students must apply the concept of conservation of matter at the particle level. When water seems to 'disappear' from a puddle through evaporation, the water particles don't actually vanish—they move from the liquid puddle into the air as water vapor (gas), spreading far apart and becoming invisible to our eyes. Choice A is correct because it accurately states that the particles still exist and describes where they went (moved into the air as gas), demonstrating understanding that particles are conserved during state changes. Choices B, C, and D represent the misconception that particles can be destroyed or fundamentally changed into different substances—this error occurs because students incorrectly think 'cannot see' equals 'does not exist' or believe water particles can transform into air particles rather than simply moving into the air. To help students: Use closed-system demonstrations like sealing a wet paper towel in a plastic bag to show water vapor collecting on the bag's sides, proving the water particles still exist even when the towel appears dry.