The mass of a 50-ml volumetric flask is 40.638 g. after adding 15.0 ml of 95% ethanol and filling to the calibration mark with water, the flask weighed 88.219 g. what is the density of the mixture?

Why does a red shoe appear red in daylight

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope