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79 10 3 = x, which is the concentration of H3O+ pH = log[H3O+] = log(79 10 3) = 210 Even without a calculator, you can estimate the pH Starting with 63 10 5 = x2, you can rewrite this in a more convenient form: 63 10 6 = x2 This is very close to 64 10 6, which has a square root of 8 10 3 = x You can estimate the pH by using powers of 10 The value of x is between 10 3 and 10 2, but closer to 10 2 The pH is between log(10 3) and log(10 2) or between 30 and 20, but closer to 20 The only value that meets these criteria is choice A 25 Answer: A + The weak acid CH3COOH dissolves to produce an acidic solution NH4Cl contains NH 4 , which is the conjugate acid of a weak base and produces an acidic solution The anion Cl is the conjugate base of a strong acid which has no acidic or basic properties The salt Mg(NO3)2 will not affect the pH because neither ion is acidic or basic The salt NaCH3COO dissolves to form Na+ ions and CH3COO ions Sodium ion has no acid or basic properties, but CH3COO is the conjugate base of the weak acid, CH3COOH This anion will make the solution basic by removing a proton from water according to the following equilibria: CH3COO (aq) + H2O(l) CH3COOH(aq) + OH (aq) 26 Answer: D The pH of buffers is determined by the Henderson-Hasselbalch equation: pH = pKa + log For this problem: pH = 314 + log [(03)] [(30)] [A ] [HA]

You should never recommend a burglary safe that doesn t have relockers and hardplate A True B False

By default, a remote server object lives a certain amount of time and then is set to null and made available for garbage collection The certain amount of time depends on the

activation type of the server component In order to give the developer control over the lifetime of a server component, the remoting framework has included a lifetime-management mechanism called remote leasing A client application can register with the lease manager in order to be notified when a server object is about to be destroyed The lease manager will notify the client and then wait a designated amount of time for the client to respond The client will return the amount of time that it wants the server to be kept alive (if necessary), and the lease manager will adjust the time to live for the server object A client class must implement the ISponsor interface before it can take advantage of the lifetime-management lease manager:

There is a single method defined in the ISponsor interface Renewal() The lease manager will call this method when the lifetime of the server component needs to be updated The client instantiates a new leasing manager:

The TL safe classification means a safe must offer protection against entry by common mechanical and electrical tools, such as chisels, punches, wrenches, screwdrivers, pliers, hammers, and pry bars, as well as ripping tools A True B False

ILease lease = (ILease) servercomponentInitializeLifetimeService();

In the preceding line, servercomponent is the remote server object reference The client then registers with the lease manager to receive lifetime updates:

// A TimeSpan object is used to control the hours, minutes and seconds // for the lease notification leaseRegister (this, new TimeSpan(0, 0, 5);

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The last step is to implement the Renewal() method and provide the details of the renewal to the lease manager:

public TimeSpan Renewal (ILease ls) { TimeSpan ts = new TimeSpan (0, 0, 5); return ts; }

That s all there is to it! The lease manager will notify the client of an object s impending destruction, and the client will send back a TimeSpan object that tells the leasing manager to inform the runtime environment that the server will live for the amount of time specified

his chapter covers the minimum you need to know about electricity and electronics to install electronic security and safety systems Part 1 focuses on electricity and Part 2 deals with electronics If you ve never installed a hardwired system (or if you have, but it didn t work right), read this chapter

Since there is so much to consider with this type of remote-method invocation, we will summarize the concepts and design considerations presented throughout this chapter EXAM TIP Use this section as a final study guide for the topic of NET Remoting