Question

exam lesson name: states of matter
exam number: 700698rr
exam guidelines
exam instructions
question 3 of 20 :
select the best answer for the question.

1. ______ is one of the few substances to exist in a solid, liquid, and gas at reasonable temperatures.

a. oxygen
b. water
c. alcohol
d. aluminum
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Explanation:

To solve this, we analyze each option:

• Option A: Oxygen is a gas at reasonable temperatures and doesn't exist as a solid or liquid under normal conditions easily.
• Option B: Water (H₂O) exists as ice (solid) at 0°C, liquid water at room temperature, and steam (gas) at 100°C (under standard pressure), which are reasonable temperatures for these states.
• Option C: Alcohol is mainly liquid at reasonable temperatures and its solid and gas states are not as common or at reasonable temperatures as water's.
• Option D: Aluminum is a solid metal at reasonable temperatures and doesn't exist as liquid or gas under normal reasonable temperature ranges.

Answer:

B. Water