Explanation:
I don't know this answer what Hydrogen Helium lithium
Method 1: gravimetry
advantages: Impurities in the sample can be identified
disadvantages: The process is long, because it goes through several stages
Method 2: titration
advantages: the process is fast, because the titrate and titrant react immediately
disadvantages: Sometimes the determination of the end point of the titration is carried out too fast or too slowly so that the calculations carried out are inaccurate
D)plastic copper
......................
It's proteins, (i took the the test and got an A) good luck hope this helps!!!
