How do lone electron pairs affect molecular shape? Please help! I know it has to do with the VSEPR theory, but I don't know how, so please explain the best you can! Thank you!

Which of the following signs of a chemical reaction are observed in the reaction of potassium with water? precipitate formed temperature change smell produced gas produced color change

If i had 2 m naoh solution, what does the 2 m stand for? 2 molar, but 2 of a solute in 1

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?