7.23 th e condensation reaction of acetone, (ch3)2co (propanone), in aqueous solution is catalyzed by bases, b, which react reversibly with acetone to form the carbanion c3h5o−. th e carbanion then reacts with a molecule of acetone to give the product. a simplifi ed version of the mechanism is (1) ah + b → bh+ + a− (2) a− + bh+ → ah + b (3) a− + ha → product where ah stands for acetone and a− its carbanion. use the steadystate approximation to fi nd the concentration of the carbanion and derive the rate equation for the formation of the product.

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.

When water dissolves sugar, which process is not involved? o dissociation o hydration o surface area of the solute increases sa

How many moles of oxygen gas are produced from the decomposition of six moles of potassium