Which of the following reactions represents an exothermic reaction?
nh3(g) + 12.0 kcal → ½n2(g) + 3/2h2(g)
ch4 + 2o2 → co2 + 2h2o + 212,800 cal
c + 2s → cs2, δh = 27,550 cal
c(graphite) → c(diamond), δh = 0.45 kcal
2h2o → 2h2 + o2, δh = +58 kcal

Which of the following true? a_volcanoes and earthquakes often near the plate boundaries. b_volcanoes occur whereve there are tall mountains. c_earthquakes cause volcanoes in the same location to erupt violently d_volcanoes and earthquakes occur only where plates are colliding with each other

Can someone me with 1 to 4 plz. fast

Imagine that a new planet is discovered with two moons of equal mass: moon a and moon b. the mass of the new planet is greater than the combined mass of its moons. moon a is farther away from the new planet than moon b. what is the planet's gravitational pull on moon a compared to the planet's gravitational pull on moon b? the planet's gravity repels moon a with a greater force than it repels moon b, which is why moon a is farther away. the gravitational pull on moon b is greater than on moon a because moon b is closer to the new planet than moon a. the gravitational pull on moon b is greater than on moon a because moon b is farther away from the new planet than moon a. the gravitational pull on moon a is the same as the gravitational pull on moon b because distance does not affect the planet's gravity.