Which statement best describes the role that gravity played in the formation of our solar system? a. gravity allowed the nebula to expand and move outward. b. gravity caused the nebula to cool enough for planets to form. c. gravity removed excess gas and dust from the cores of the planets. d. gravity pulled particles of dust and gas together to form planets.

How many electrons does silver have to give up in order to achieve a sido noble gas electron configuration?

Blank allows you to do calculations for situations in which only the amount of gas is constant a)boyle's law b)combined gas law c)ideal gas law d)dalton's law

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.