Which of the following is true for a heating curve?
a. it shows how the pressure of a substance changes when heated.
b. it shows how the temperature of a substance changes when heated.
c. it shows how the volume of a substance changes when heated.
d. it shows how the mass of a substance changes when heated.

the answer is b: it shows how temperature of a substance changes when heated.

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.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons