Sodium reacts explosively with water. which other element would you expect to react similarly with water? (1 point)
a. helium (he)
b. cesium (cs)
c. xenon (xe)
d. carbon (c)

2) a cubical block of stone is lowered at a steady rate into the ocean by a crane, always keeping the top and bottom faces horizontal. which one of the following graphs best describes the buoyant force b on this block as a function of time t if the block just enters the water at time t = 0 s?