Which observation confirms the presence of oxygen gas?

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Multiple Choice

Which observation confirms the presence of oxygen gas?

Explanation:
Oxygen supports combustion, so a glowing splint relights when it is placed in oxygen. The extra oxygen helps the ember flare back into flame, making relighting a glowing splint a clear sign of oxygen gas. Other observations point to different gases: a squeaky pop comes from hydrogen reacting with flame, limewater turning cloudy indicates carbon dioxide, and damp red litmus turning blue shows an alkaline gas like ammonia. None of these specifically confirm the presence of oxygen.

Oxygen supports combustion, so a glowing splint relights when it is placed in oxygen. The extra oxygen helps the ember flare back into flame, making relighting a glowing splint a clear sign of oxygen gas.

Other observations point to different gases: a squeaky pop comes from hydrogen reacting with flame, limewater turning cloudy indicates carbon dioxide, and damp red litmus turning blue shows an alkaline gas like ammonia. None of these specifically confirm the presence of oxygen.

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