The average kinetic energy of water molecules decreases when 1.
H2O(2) at 337 K changes to H2O(2) at 300. K
2.
H2O( 2) at 373 K changes to H2O(g) at 373 K
3.
H20(s) at 200. K changes to H2O(s) at 237 K
4.
H2O(s) at 273 K changes to H2O() at 273 K

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest

Why do lunar and solar eclipse not happen every month

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.