A beaker containing a solution of NaCl and water is covered with a watch glass and slowly heated. Drops of liquid are observed to form on the underside of the watch glass. These drops of liquid are: a. pure Naci
b. more concentrated NaCl solution
c. less concentrated NaCl solution
d. pure water

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.