For your questions:
Question 1: The best characterization of Gay-Lussac's Law is:
- "The pressure of a gas is directly proportional to its temperature when the volume is constant."
Question 2: When the candles are extinguished, the water level ______. (You would need to refer to the specific scenario from the demo, but generally, if the air inside the glass cools, the water level would rise as the pressure inside decreases, allowing external air pressure to push water into the glass.)
Question 3: For the direct relationship between pressure and temperature (Gay-Lussac's Law), the correct statements are:
- "As temperature increases, pressure increases."
- "As pressure increases, temperature increases."
These statements highlight the direct relationship between temperature and pressure when volume is held constant.
Feel free to provide more context or ask for clarifications if needed!