A scientist finds a shiny piece of metal that he thinks is aluminum. in the laboratory he determines that the metal has a volume of 245 cm^3 and a mass of 612 g. Calculate the density’s

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

Helium decays to form lithium. which equation correctly describes this decay?

Which answer tells the reason the earth’s climate is getting warmer? too many animals are becoming extinct. large glaciers are melting in antarctica. the earth is moving closer to the sun. driving cars gives off gases that trap heat in the atmosphere.