What is cornstarch? hey se my favorite actor's new series pic looking like a cute couple​

Which of these conditions most likely produces an unstable isotope?

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.