Which of the following constants is/are needed to calculate the amount of energy required to heat 12.0g of H2O(l) at 30.0°C to H2O(l) at 85.0°C? I. ΔHfus (H2O) II. ΔHvap (H2O) III. specific heat of H2O(s) IV. specific heat of H2O(l) V. specific heat of H2O(g)

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

answer: the figure is attached herewith.

step-by-step explanation:   we are given to sketch a unit circle and label the terminal points corresponding to

in the attached figure, we have drawn a unit circle, with centre at o(0,0) and radius 1 unit. we have labelled the points a, b, c, d and e corresponding to the angles below

∠aox = 60°,

∠box = 120°,

∠cox = 180°,

∠dox = 240°,

∠eox = 300°.

and the coordinates are a(0.5,1), b(-0.5,1), c(-1,0), d(-0.5,-1) and e(0.5,-1).

thus, the answer is complete.

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation: