7. Mr. Wurtz performed a demonstration for his science students in a well-ventilated room. He mixed together two samples of different white powdery substances in an open beaker. The dry mixture soon became wet, and the students could smell ammonia. The temperature of the beaker dropped dramatically, so much so that the liquid that formed in the beaker began to freeze. A liquid formed at the bottom of the beaker. The temperature of the mixture dropped dramatically. Powder 2 Ammonia Odor O Agas with a strong smell was released from the mixture. time The powdery substances dissolved in the water. Icy Solution CLEAR ALL Powder 1 Mr. Wurtz told the class that a chemical reaction had occurred inside the beaker. Which of the following is not evidence that a chemical reaction occurred?A. A liquid at the bottom of the breaker B. The temperature of the mixture drop dramatically. C. A gas with a strong smell was released from the mixture. D. the powdery substances dissolved in the water.