Question

directions: select each correct answer. marco is about to combine a red and blue liquid as shown below as part of an experiment. he is using a color - mixing key to observe if the results are as expected. color mixing key red + blue = purple red + yellow = orange blue + yellow = green red + blue + yellow = gray the results below show four possible results of marcos experiment. in which three of the results has a chemical change most likely happened? purple liquid with gas bubbles green liquid purple liquid purple liquid with condensation

Explanation:

Step1: Recall signs of chemical change

Gas production, formation of a precipitate, and color - change along with energy change are signs of chemical change. Condensation is a physical change (change of state).

Step2: Analyze each result

• Purple liquid with gas bubbles: Gas production indicates a chemical change.
• Green liquid: A new color is formed which can be a sign of a chemical reaction as per the color - mixing key.
• Purple liquid with condensation: Condensation is a physical change (vapor to liquid), not a chemical change.
• Purple liquid with what seems like a precipitate: Formation of a solid (precipitate) in a liquid indicates a chemical change.

Answer:

Purple liquid with gas bubbles, Green liquid, Purple liquid with condensation