20 points A group of students combined several different substances together during several experiments. Their observations are recorded on the chart below. Experiment Observations 1 A blue liquid and a yellow liquid were mixed and it turned green. 2 A solid substance dissolved in a clear liquid. 3 Two room temperature liquids were mixed and the temperature increased. 4 Two different liquids were mixed and began to separate and layer in a beaker. In which experiment did a chemical reaction likely occur