Please help ill give a reliable indicator for an upcoming storm would be a...

A ) Drop in relative humidity
B ) Rise in pressure
C ) Drop in pressure
D ) Change in dew point

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.