1. Situation: Sarah has a glass of juice that she forgot to drink and left it on the table overnight. When she checked it the next morning, the level of juice in the glass had decreased. What happened to the volume of the juice?
a) It increased.
b) It decreased.
c) It remained the same.
d) It evaporated completely.
2. Situation: James has a balloon filled with air. He decided to squeeze the balloon gently. What change did James observe in the balloon?
a) The balloon's shape remained the same.
b) The balloon's volume increased.
c) The balloon's volume decreased.
d) The balloon's volume remained the same.
Answer (2)
What Happened: The volume of the juice decreased due to a process called evaporation. Evaporation is when a liquid changes into a gas and escapes into the air.
Why It Happened: The molecules at the surface of the juice had enough energy to break away from the liquid and become vapor. This is more likely when a liquid is left open to the air, especially over hours.
How It Affects: As more molecules evaporate, the liquid level in the glass drops, leading to a decrease in volume.
Situation: James gently squeezed a balloon filled with air. The correct answer is c) The balloon's volume decreased.
In Sarah's situation, the juice level decreased due to evaporation, so the correct answer is b) It decreased. In James' case, squeezing the balloon caused its volume to decrease, so the correct answer is c) The balloon's volume decreased.
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