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    See if someone is invisible (pop out chat) on facebook?

    Is there a way to find out if someone has popped out of the chat and become invisible on facebook? Thanks for any help! I mean see if they went offline so no one can see them.
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    Can someone help me w/ this pH chemistry problem?

    Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.70. You have in front of you 100 mL of 6.00×10−2 M HCl , 100 mL of 5.00×10−2 M NaOH , and plenty of distilled water. You start to add HCl to a beaker of water when someone asks you a question. When...
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