What is the best description for a solution with a hydroxide-ion concentration of 1x10⁻⁴m?

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

Equal numbers of moles of he(g), ar(g), and ne(g) are placed in a glass vessel at room temperature. if the vessel has a pinhole-sized leak, which of the following will be true regarding the relative values of the partial pressures of the gases remaining in the vessel after some of the gas mixture has effused?