2.27. The volume of a microbial culture is observed to increase according to the formula V(cm') = e
where r is time is seconds.
(a) Calculate the expression for V(in.) in terms of (h).
(b) Both the exponential function and its argument must be dimensionless. The given equation
seems to violate both of these rules, and yet the equation is valid. Explain this paradox. (Hint:
Observe the result of part (a).
2.28. A concentration C (mol/L) varies with time (min) according to the equation
C = 3.00 exp (-2000

c. orbital shape i hope this is correct

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.