Unkown Y Lab

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Unkown Y Lab Report

The melting and freezing point lab that was conducted was done in order to study phase changes in different substances. A phase change is when a substance absorbs or releases energy in order to change between a solid, liquid, and gas. In the experiment each group of partners was given a test tube with an unknown substance in it. Within the substance was a thermometer to measure the temperature change as it went through phase changes. Before starting the experiment they built a double ring beaker setup with a test tube clamp connected. Next, they clamped the test tube to the ring stand so that the substance was submerged completely in the warm water. Groups recorded the temperature of their unknown substance every thirty seconds. They continued to melt the unknown substance until it completely liquified. Next, they removed the test tube from the hot water and began …show more content…
Although, when the unknown substance was around halfway liquified the data reached a flat line where the temperature stayed the same for over two minutes. After around two and a half minutes the temperature rises, increasingly faster than before and the substance is quickly melted the rest of the way. The heat flow during the freezing point part of the experiment was a much more gradual change. The substance loses energy and heat much slower than it, gained it in the beginning. Then, just like the melting point line on the graph, the data reached another flat line. Then afterwards continues with much more dramatic drops in temperature. These flat lines in the graph signify the phase changes in the substance. When the data on the graph goes flat line that is the time in the heating or cooling when the substance does not have enough energy to break the bonds holding it to its current phase in order to change phases so the temperature doesn't change during this
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