The purpose and significance of this experiment was to find the specific heat and figure out an identification of an unknown metal. The specific heat was calculated through a given formula. The unknown metal was found through descriptions that matched the unknown metal. The unknown elements would be one of the following: Al, Bi, Cd, Cu, Fe, Pb, Ni, Na, Sn, or Zn. First the specific heat of water was measured, then heat flow was measured using equations. Then, using two coffee cups, observe the temperature increase from the first thermometer in the calorimeter. After it has stopped increasing, record the final temperature. Next, weight a small portion of your unknown sample and record the mass and place it in the water bath for ten minutes and record the temperature. Pour the unknown element into the calorimeter. Monitor the temperature and record it in the data table. Repeat the procedure and record the findings on the data sheet. After all these steps are done, identify the unknown substance by another …show more content…
Density is an example of intensive property. Heat capacity is determined by the amount of energy that is required to raise the temperature of an object by one degree Celsius. The specific heat is quite similar to the heat capacity except that the heat required to raise one gram of a sample is by one degree Celsius. The specific heat for water is 4.184 J/g °C. Molar heat capacity is the amount of energy required to raise the temperature of one mole of a substance by one degree Celsius. A calorimeter works through an insulated container and a thermometer. The container has to be insulated so that it could minimize the hat loss and gain the sources from the outside system. The Law of Conservation of Energy is used to find calculations. A second intensive property is needed to determine the unknown because many substances have similar specific heat values.
Unknown Lab Report Unknown # 25 By: Jenna Riordan March 19, 2018 Bio 2843 1. Introduction Microbiology is the study of microorganisms found in all different environments throughout Earth, from the hot thermal vents at the bottom of the ocean to the ice at the top of a mountain.
Approximately 12 mL of cyclohexane was put into a test tube and measured to be 9.09g. The test tube was placed in the ice bath and the temperature was measured with a thermometer in intervals of two seconds. The recording stopped once the stirring rod could not move anymore and the temperature was constant for 10
Data Analysis It was evident throughout the experiment that in the compound the metal determined the color of the flame. The color depended only on the metal component of the compound. The non-metal element that was in the compound did not mater. Compounds with Lithium (Li) were always red, compounds with Sodium (Na) were always yellow, compounds with Calcium (Ca) were always orange, Compounds with potassium (K) were always lilac, and compounds with Copper (Cu) were green.
The observed emission data for the different elements did not look how they were supposed to. However the “peaks” for Hydrogen were found to be 534.52 and 631.24, 534.70 and 569.11 for Helium and 529.73 and 630.71 for Mercury. The Rydberg’s Constant found to 1.1x107 8.5x104 while the known constant is 10967758.34m-1. The percent error of 0.29% and the accuracy of this reading is 99.7. The slope and intercept of the linear regression line is -0.01 3.3x10-5 and 0.02x10-1 1.9x10-6 respectfully.
This caused the percent error to be high. Trail 3 was successful in determining glucose to be the unknown
Solar Cookers Planning Board Theoretical background Explain conduction, convection, and radiation. How are solar cookers used in developing countries? Why will this modification increase the temperature change of the water? Conduction is the process by which heat or electricity is directly transferred through the material of a substance where there is a change of temperature or electrical potential between connecting regions, without movement of materials. Some examples of conduction heat are.
I had gotten a call on Monday at around 4:00 in the morning to come in at the large firm as a dead body had been found in the building. I reached at the large firm at 5:00 AM and found police cars, ambulances, and fire trucks at the scene. A few of my colleagues had come up to me to give me the information from the cleaning crew who had found the dead body. I asked the coroner to measure the body’s temperature and he told me it was currently 88.2oF. I decided to wait an hour to see the decrease in the body’s temperature.
There will be a stir that helps distribute the heat evenly all through the water. A temperature probe determines the amount of heat given off and converts it to joules. Components of a Bomb Calorimeter The main elements of a bomb calorimeter are: • Dewar or insulating jacket: is the body of the calorimeter which is made up of a doublewalled flask of metal with a vacuum between the two walls to prevent the transfer of heat.
Since the coffee and the refrigerator have a different temperature, the coffee temperature will decrease and will try to reach the same temperature with its surrounding. When we look at the sample values, we can see that the coffee’s temperature actually reached the same temperature as the refrigerator which is about 12.9°C and it stays constant no matter how much time pasts. Therefore, this experiment was an exponential case. Additionally, in order to know the amount of time it takes for the coffee to be 40.0°C, we could insert the number in the equation and calculate it, or find the value by using the graph above.
Effect of Yeast on Temperature on Hydrogen Peroxide Solution in Water Khalid Al Sabeeh Ms. Dobrin 11-G Chemistry HL Jan 5, 2015 Abstract: Within this lab yeast was added to hydrogen peroxide solution in water. Temperature was the factor to be tested. In all trials, the initial and final, when yeast was added temperatures increased by 10˚C respectfully per trial.
Since items are rarely an indistinguishable temperature
Calorimeter helped many generations to measure the quantity of heat using different types of devices; also they followed a specific procedure and equations to find out quantitative
A sample Calculation Calculation of the dissolved amount: Initial weight - Weight of substances left after the solution reached saturated state = Dissolved amount of substance Calculation for the average of three trials: (Data of 1st trial + Data of 2nd trial + Data of 3rd trial) / 3 = Average Appropriate Graph(s) For Electrical Conductivity Experiment: Raw Data Table (Credit: Cynthia, Emily, Haruka, Joshua, Keimin, Sean, Reorganized by me)
Mg (s) + 2Ag+ (aq) Mg2+ (aq) + 2Ag (s) Solution Number of moles of Mg = 0.700 ÷ 24.1 = 2.9046 x 10-2 mol Number of moles of AgNO3 = 75.0/1000 X 0.250 = 1.875 x10-2 mol Thus AgNO3 is the limiting reagent. Energy released to surroundings =