Asurface area of a sphere can be approximated as follows: surface area=4r^2 where the radius of the sphere is a constant that is roughly equal to 3 using the simple approximation above, calculate the surface area of a sphere with a radius of 2

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Iknow #2 is d. i just need to know why

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.