Which statement is true about a reversible reaction? (5 points) A)It results in an equilibrium mixture of reactants and products.
B)It has equal mass of all reactants.
C)It produces salts from acids and bases.
D)It has equal number of products and reactants.

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.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Air can be considered a mixture. which statement does not explain why?