Why are the zones common places for igneous rock to form?

Why is nh3 classified as a polar molecule

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest