Blog

What is the purpose of using a non-exportable digital certificate on a company-owned workstation in the context of a VPN?

A forensic specialist is examining the hard drive of a computer and has determined that the hard drive uses the HFS file system. From which type of computer did the hard drive originate?

What is the term used for a section of code in a program that permits someone to bypass access controls and access data or functions?

In the context of logical access controls, how are the terms “subject” and “object” related?

Suppose a Voltaic cell at standard conditions, runs on the reaction,  Sn(s) + Nr2+(aq)   à  Sn2+(aq) +   Nr(s) The standard cell potential, E°cell = 0.30 V. What is the new value of Ecell if the concentrations are changed to  [Sn2+] =  {M} M       and         [Nr2+] =  .30 M? Hint:  The voltage will be less than E°cell       Answer format:  Enter the answer in Volts but do not include the units.  Enter 2 sig figs in standard notation. 

What is the pH of a solution that consists of {HA} M HX and {A-} M X-? Use the value of Ka for HX from the table at the bottom of the page. Answer format:  Enter the pH using 3 digits in standard notation. 

What mass of metal X will be formed by passing {I} A through XNO3(aq) for {t} seconds? The molar mass of X is given in the Molar Mass Table at the bottom of this page. Answer format:  Enter your answer in grams but do not include the units.  Enter 2 sig figs in standard, not scientific notation.

Locate atom “a)” in the Atomic mass table at the bottom of the page.  Calculate the nuclear binding energy (in J/atom) for atom a). Answer format:   The answer will be in the form:  ___ x 10-12 J.  Only type the part that goes in the blank. Do not type “x 10-10 J”.  Round to 2 sig figs, do not round until the end of the calculation.

Refer to compound #2 in the list at the bottom of this page.  Convert {X} mole fraction of compound #2 in water to mass percent. Answer format:  Enter the mass percent in standard notation without the units or a % symbol.  Use 2 sig figs.  

Please use rate 3 in the data at the bottom of this page. For the reaction,   2J + 3K + Là 5M + 7N, if the concentration of K is decreasing at rate 3, what is the rate of increase of [M]?