Multiple Choice
What volume of oxygen gas, measured at STP, is required to completely react with 4.00 g of hydrogen gas (H_2) according to the reaction: 2 H_2(g) + O_2(g) → 2 H_2O(g)?
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7. Gases
Gas Stoichiometry
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Which device disperses oxygen by using an air pump to the plants through a diffuser or air stone?
A
Aerator
B
Manometer
C
Desiccator
D
Barometer
Verified step by step guidance1
Understand the function of each device listed: an aerator, manometer, desiccator, and barometer.
Recall that an aerator is a device designed to introduce air (or oxygen) into a liquid, often using an air pump and diffuser or air stone to disperse oxygen effectively.
Recognize that a manometer measures pressure differences, a desiccator removes moisture from samples, and a barometer measures atmospheric pressure; none of these disperse oxygen to plants.
Identify that the device which disperses oxygen by using an air pump through a diffuser or air stone is the aerator.
Conclude that the correct answer is 'Aerator' based on its function related to oxygen dispersion in aquatic or plant environments.
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