Help, please this is a science task, and I need to explain what’s the difference between expansion and contraction (please don’t paste the answers your gonna put here) (it has to be your own words) the first person to help me will get)

The density would be 1.622

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

Adialysis unit requires 78.5 l of water.the estimated digit is 5. 

We can't until we know what we are working with or on