Which statement 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 correct option is B.

A heating curve refers to a graphical representation of how the temperature of a compound change when heat is added to it. The graph shows the phase transition that a substance undergoes as heat is added to it. The plateaus on the curve represent the critical temperature points where phase changes actually occur. The curve has two axes, the vertical and the horizontal axes. The temperature of the substance is typically plotted on the vertical axis while the time during which heat is applied is plotted on the horizontal axis.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

the correct answer is:

a. formation of precipitation