Select the number of electrons each atom must gain or lose to have a full valence level. use the periodic table if you need . a calcium atom (ca) will a fluorine atom (f) will a lithium atom (li) will an argon atom (ar) will an aluminum atom (al) will

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?