Calculate the density of a sample of gas with a mass of 30 g and volume of 7500 cm3

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?

Click the button that shows the correct relationship of the electron affinities of the elements sodium and phosphorus. sodium’s electron affinity value is more negative than the electron affinity value of phosphorus. phosphorus’ electron affinity value is more negative than the electron affinity value of sodium. this information cannot be determined using the periodic table. answer is b on e2020.