Which means "to study or examine”?

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule

Identify the lewis base in this balanced equation: fe3+ h2o fe(h2o)63+