I might give brainliest: Please help, I have one question: why are there some differences when measuring something with a measuring tape and measuring something with an app?

There are differences between measuring something with a measuring tape and measuring something with an app because different items are being used. Only measure items using the right measuring tools.

Some differences when using a measuring tape and using an app to measure something is that..
-the scale will be different
-one may be more accurate than the other
-technology can sometimes have bugs or other factors such as a bad camera quality that might give false results
-using a measuring tape could cause some limitations such as how much you can measure
-using an app may allow you to measure longer distances due to a more endless resource instead of something materialistic

It won't lose or gain electrons if it's a covalent bond it shares the electrons with another atom or atoms. if it is an ionic bond it will lose the 3 electrons on the outer shell and become a positively charged ion.  credit goes to @sunshinebaby of answers.yahoo.com.