When we bubbled our exhaled air into the test tube containing limewater, and it went from clear to cloudy, this reaction occurred because exhaled air contains:

Group of answer choices

carbon dioxide

oxygen

heat

water vapor

1 answer

The reaction that occurred when exhaling air into limewater, causing it to go from clear to cloudy, is due to the presence of carbon dioxide in exhaled air. When carbon dioxide is bubbled through limewater (calcium hydroxide solution), it reacts to form calcium carbonate, which is insoluble and causes the solution to become cloudy.

So the correct answer is carbon dioxide.