What is the charge on the cation in the iconic compound Sodium Sulfide?

What is the approximate vapor pressure when the gas condenses at 70 degrees celsius

What is a difference between a mixture of elements and a mixture of compounds

Ineed this awnser fast select the correct answer. this chemical equation represents the burning of methane, but the equation is incomplete. what is the missing coefficient in both the reactants and the products? ch4 + → co2 + a. 0 b. 1c. 2d. 3 e. 4