MSED 250

 This week we took a deeper look into exothermic and endothermic reactions. First as a group we discussed and defined each reaction. A exothermic reaction is when energy is released in the form of heat, and a endothermic reaction is when heat is absorbed from the surroundings.  Materials: Calcium chloride Sodium bicarbonate (baking soda) Citric acid Beakers Stirring rods 100ml graduated cylinder Thermometer Exothermic reaction:  My partner and I first used the thermometer verify that the water was at room temperature. Next we measured out 10 ml of calcium chloride chips and added it to the water, creating a solution. Following this we recorded the change in temperature every 5 seconds for 1 minute. Our data showed that the temperature was rising at a constant rate, and the maximum temperature was 30 degrees Celsius. As seen below we created a graph based off our data to represent the changes in temperature over time.  Exothermic reaction:  Similar to...

This week we were focusing on thermal dynamics, thermal energy, and the physics of cold. To further our understanding we conducted an experiment that involved the physics of cold. I gained knowledge of dry ice and how to manipulate it. I also learned that dry ice is a solid form of carbon dioxide, and its phase of change is sublimation. We also took a closer look as to why boo bubbles fall instead of float. This is because carbon dioxide is heavier than the surrounding air, and the gas inside the bubble is heavier than the surrounding liquid causing it to fall. Listed below are the materials used.  Materials: Dry ice  Container that can be sealed Insulated gloves  Dish soap  Plastic tubing  Boiling water Small cup Experiment:  My partner and I first filled our container with boiling water, then filled our smaller cup with dish soap. Next we placed the plastic tube into the dish soap, then put the dry ice inside of the container and sealed the lid. Once the ...

For this lab my partner and I had the goal to record and observe the the color, physical structure, and timing of bubbles. To start we first labeled 4 transparent cups A-D. each cup was filled with 1/4 cup of water, then we later added specific measurements of detergent, sugar, and glycerin. Below is a picture of the table we used, and our observations of each bubble. CUP A: the contents of this cup was water alone. When we tried to create a bubble with only this liquid we found that it was not possible.  CUP B: the contents of this cup consisted of water and one teaspoon of laundry detergent. We discovered that this solution was much easier to work with, and we were able to get strong long lasting bubbles. They seemed to last 40 seconds or more with out manipulation, and up to 1 minute when paired with other bubbles that formed a wall. The colors we noticed were blue, red, and green, and noticed the bubbles began to ripple before the popped. The photo below is the bubble with only...

01/24/2021: To further expand my understanding on solutions and phase of change, my professor constructed a lab that allowed my partner Kayla and I to mix and create Oobleck and Glurch. During this lab we were provided with the following:  Materials: Glue Borax  Measuring tools  Mixing tools  Beakers and flasks  Water  Zip lock bags  Corn starch  In order to complete this lab we first started by creating the Oobleck. To do this we first measured out 3/4 cup of glue, and poured it into a beaker. Next we added 1 teaspoon of water and mixed the two together. Following this we then created the borax solution which consisted of 1 tablespoon of borax and about 1 cup of water. Once the borax had completely dissolved we added the solution to the glue and water mixture. In result we were left with a elastic like substance. The pictures below show the result of my partner and I making the Oobleck.   Next we created the colloid solution glurch. Fir...