Molar refraction rm is an additive property, sometimes it is regarded as a sum of the increments of chemical bonds, e. g.: c-c 1.21 cm mot! , cc 4.15 cm mot! , c-h 1.7 cm moth, etc. liquid hydrocarbon c6h12 has den- sity = 778.4 kg m and its refractivity index n=1.4260. using the molar refraction, decide if it is hexene or cyclohexane. a) rm = 27.70 cm moll, hexene b) rm - 29.39 cm mot hexene c) rm = 27.66 cm3 mol-1 cyclohexane d) rm = 29.39 cm3 mol-1.cyclohexane

Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

What are the two major rules associated with polarity