Methyl red has a pka of 5.0 and is red in its acid form and yellow in its basic form. if several drops of this indicator are placed in a 25.0-ml sample of 0.100 m hcl, what color will the solution appear? if 0.100 m naoh is slowly added to the hcl sample, in what ph range will the indicator change color?

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.