What phase change occurs if the pressure of a substance is constant at 0.25 atm and the temperature is increases from -200 to 200 degrees celsius? Melting
O Freezing
O Vaporization
O Condensation
Sublimation
O Deposition

Ionic compounds are made of ions, and yet the overall charge of an ionic compound is neutral. why?

Which statement describes james chadwick’s discovery.

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.