If the density of a certain spherical atomic nucleus is 1.0 × 1014 g / cm–3 and its mass is 2.0 × 10–23 g, what is its radius in cm?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Given the following equation: 2a1 + 3mgcl2 --> 2alcl3 + 3mg how many moles of aluminum chloride are produced from 2.5 moles of magnesium chloride?

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.