I am totally confused about this temperature graph. Please tell me what is going

Question

I am totally confused about this temperature graph. Please tell me what is going on at each level. (Flat lines andslopes, specify if melting, phase change, etc.) Next graph is similar: Ideal Gases - Temperature andDensity Also confused with this problem. Please tell me whateach graph is and what is going on. I keep thinking that density is greater when temperature isincreased (similar to water) but I may be incorrect when it dealswith ideal gases - is the answer (A)? Thanks for your time.

Explanation / Answer

(1)SOLUTION ---->  Choice(C ) "liquid spc heat> solid spc heat" Horizontal lines represent phasechanges, the first being solid to liquid, and the second being liquid to gas. In between are the temperature increases which occur when material is heated. This process graphs with a slanted line whose slope is proportional to the reciprocal of material specific heat. The greater the slope of the slanted line, the smaller will be the specific heat. Thus, from given graph, we observe the liquid's slanted line slope is less than the solid's slanted line slope, indicating the liquid's specific heat is greater than the solid's specific heat. (2)SOLUTION ---->  Choice(D ) "density = constant" Density equals mass divided byvolume. For this problem, mass is constant and volume is constant. Therefore, density is constant (even though temp is being increased). Constant density will graph with a straight line parallel to the temp axis, which is shown in Graph #D. .

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