2which equation below depicts the reaction from which the first ionization energy would be determined?
e ca(s) + e- → ca-(g)
(g) → ca+(g) + e-
(d ca(g) ca2+ + e-
b ca(s) ca+(g) + e-
e none of these

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

Upon decomposition, one sample of magnesium fluoride produced 1.65 kg of magnesium and 2.56 kg of fluorine. a second sample produced 1.32 kg of magnesium. part a how much fluorine (in grams) did the second sample produce?

How many moles of lead are in 1.50 x 10^12 atoms of lead? could you explain the answer as well and not just give it to me i am refreshing for finals and i need to know how to do it