Which half-reaction correctly represents reduction? (1) ag --> ag+ + e–
(2) f2 --> 2 f– + 2e–
(3) au3+ + 3e–--> au
(4) fe2+ + e– --> fe3+

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

How many molecules are in 6.0 moles of methane

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?