Not all chemical reactions are reversible. Many, however, can be identified by observing one or more of the five signs below. Look at the five signs a chemical reaction is occurring and match the best example with the sign, one example per sign. One option will not be used. (5 points)

Question

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Production of heat and light Formation of a gas (bubbles) Color change Odor change Formation of a precipitate
Using a propane heater in a deer blind, A banana ripening, Cookies baking in the oven, Vinegar and baking soda foaming like a volcano, The formation of solid lead (II) iodide from sodium iodide and lead (II) nitrate, Phase change of liquid water to steam.

Answer 1

Here are the best examples matched with each sign of a chemical reaction:

1. Production of heat and light: Cookies baking in the oven
2. Formation of a gas (bubbles): Vinegar and baking soda foaming like a volcano
3. Color change: The formation of solid lead (II) iodide from sodium iodide and lead (II) nitrate
4. Odor change: A banana ripening
5. Formation of a precipitate: (Not applicable since the phase change of liquid water to steam is not a chemical reaction and therefore not usable in this context.)

The unused option: Phase change of liquid water to steam.