Calculate the ph of an aqueous solution that is 0.020 m in hcl(aq) at 25°c.

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

What term is missing from the central region that describes hypotheses, theories, and laws? popular predictable mathematical falsifiable

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.