Two scientists found impurities in what was supposed to be pure Argon gas. Investigations of these impurities led to the discovery of 3 new elements that have very similar chemical properties to Argon. Which of the following are most likely the three elements discovered? A. neon, krypton, and Xenon
B. sulfur, chlorine, and argon
C. fluorine, chlorine, and bromine​

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

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next

Northern was a learned a fairly cold climate caused by see one from the atlantic ocean, but se was real and tends to be much warmer, sonia look good causes difference. a. cool wins cannot blow across a leg into the south mountains, b. prevent cold air from blowing over into south sea, c.the south is at much higher elevation, so it is closer to the sun, d. suppose early and has a sperience a drastic climate change in the past few years.