Question

lesson 42 - classification of materials
what caused the candles to go out?
(1 point)
izzy blowing on them
carbon dioxide
hydrogen
oxygen

Explanation:

Combustion requires oxygen. Carbon dioxide is denser than air and displaces oxygen, extinguishing the candles. Hydrogen is flammable and would not put out the candles. There is no indication Izzy blew on them from the setup shown.

Answer:

carbon dioxide