In the process of fractional distillation, the components of petroleum are separated according to
a. boiling point
b. carbon-to-hydrogen ratio
c. reactivity with oxygen
d. melting point

What substance has a mass of 9.5g and volume of 2.1cm^3

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.

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring