The graph below shows a pure substance which is heated by a constant source of h
ID: 589587 • Letter: T
Question
The graph below shows a pure substance which is heated by a constant source of heat supplying 2000.0 joules per minute. Identify the area described in the questions below and complete the necessary calculations. UV = 0,36 min, VW = 3.6 min, wX = 3.6 min, XY = 19,4 min, YZ = 0.6 min 120 temp 50+ tine --> Short description of how you know the answer a. being warmed as a solid b. being warmed as a liquid c. being warmed as a gas d. changing from a solid to a liquid e. changing from a liquid to a gas f. What is its boiling temperature? g. What is its melting temperature? h. If the sample weighs 10.0 g, how many joules were needed to change the liquid to a gas? Where on the curve do the molecules have the highest kinetic energy? j. If the sample weighs 10.0 g, what is its heat of vaporization in J/g?Explanation / Answer
(a)
The region is UV, because the slope is constant and the temperature is rising.
(b)
The region is WX, because the slope is constant and the temperature is rising, and also the portion UV is behind it which means it has to be the liquid portion because UV portion is for solid.
(c)
The region is YZ, because the slope is constant and the temperature is rising, and also the portion WX is behind it which means it has to be the gas portion because WX portion is for liquid.
(d)
The region is VW, because the slope is zero which means latent heat is being absorbed so this indicates phase change. Also, upto point V, the state is solid.
(e)
The region is XY, because the slope is zero which means latent heat is being absorbed so this indicates phase change. Also, upto point X, the state is liquid.
(f)
Boiling point temp is 1000C, because XY is on this particular line.
(g)
Freezing point is 00C, because VW is on this particular line.
Hope this helps !
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