Annie performed an experiment in her kitchen. She poured 2 cups of water in a large glass. She added three drops of green food coloring to the water. The water slowly turned green. She added an Alka-Seltzer® tablet to the water. The tablet began to fizz and create bubbles in the water. Which of the following is evidence of a chemical change in Annie's experiment?   ANSWERS ARE  a) color change b) formation of a gas c) change of state d) flammability

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