In the reaction hf + al alf3 + h2, which two substances would have a coefficient of 2 if the reaction were balanced?

check all that apply.
a. h2
b. al
c. alf3
d. hf

radiation warms things up temp rises convection currents air circ windy weather

measuring things 1 litre of water

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.