What happens when an acid reacts with a metal such as magnesium?
a the metal becomes polished and shiny
b a chemical reaction occurs
c the acid is converted to a base
d the temperature decreases

Which statement justifies that phosphine (ph3) is a polar molecule?

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

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.