Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°c.
a. zn(s) + na+(aq)
b. fe(s) + ba2+(aq)
c. cr3+(aq) + ni(s)
d. sn4+(aq) + mg(s)

If the root word engage means “to connect with something,” what does the word disengage mean in the following sentence? he disengaged the gears by stepping on the clutch pedal.a.added more engine powerb.activated a connection to the pedalc.stalled the engined.released a connection to the pedal

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)