You drip a liquid substance onto a metal plate. You hear a hiss, and see a gas rising from the spot where the liquid touches the metal plate. What indicates a chemical reaction in this scenario?

the formation of a new gas

the hissing sound as the liquid touches the metal

the decrease in temperature as the liquid touches the metal

the liquid being in contact with a metal

the answers would be

the first one and the second one

it was spontaneous.

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