Data Processing During the collection of data‚ our group noted the effect that temperature change had on aquatic macro invertebrates. Our data was collected from three different ponds amongst the Lake Harriet/Lake Calhoun vicinity. We took samples from the bird sanctuary pond‚ Lake Calhoun holding pond and the Lake Harriet duck area. Prior to our procedure‚ we measured the temperatures of each pond area. We used the low-temperature climate (bird sanctuary pond) to compare to the higher-temperature
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Christy Stroud/CIST 1305/Chapter 1 Assignment #2. Write a program that computes and displays a 15 percent tip when the price of a meal is input by the user. (Hint: the tip is computed by multiplying the price of the meal by 0.15.) Declare MealPrice as a float Declare Tip as a float Write “Enter price of meal:” Input MealPrice (get price to calculate) Set Tip = MealPrice * 0.15 (calculate) Write MealPrice (output data) #3 Write a program that converts a temperature input in degrees Celsius
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Determining the enthalpy change for the thermal decomposition of potassium hydrogen carbonate into potassium carbonate. Controlled Variables: 1. Volume of HCl ± 0.5 cm3 (± 2%) 2. Concentration of HCl‚ 3. Same mass of K2CO3 and KHCO3 within specified ranges of 2.5 – 3.0g and 3.25 – 3.75g respectively 4. Same calorimeter used i.e. polystyrene cup is used in this experiment 5. Same thermometer will be used ± 0.10K 6. Same source of K2CO3‚ KHCO3 and HCl Raw Data Results: The raw
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Energetics Practical 2: To Determine the Enthalpy Change of a Reaction Background Calcium Carbonate‚ CaCO₃‚ decomposes with heat to form CaO and CO₂. The objective of this practical was to determine the enthalpy change for this reaction by using an indirect method based upon the foundation of Hess’ Law. Both calcium oxide and calcium carbonate react readily with 2 mol/dm3. The reaction can be demonstrated as so: CaCO₃ (s) -> CaO(s) + CO₂ (g) Results: Raw Data Calcium Carbonate Mass of CaCO₃
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Case study 1 i. Five possibilities that cause food poisoining that occurred during the wedding based on the Case Study. a. Time interval The food that has been cooked early in the morning that is at 10:00 to 11:00 am and it is been served between 1:30 to 3:30 p.m. That almost took as long as 4 hours. This cause the food spoiled and stale as the food has been stored long. b. No covers for the containers of raw food Microorganisms require nutrients to grow. Raw food has a moisture condition
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Charles Law IA Temperature of Water (0c) +-20c | Volume of Gas (ml)+- 1ml | Total Volume(ml)+- 1ml | 17 | 0 | 250 | 27 | 10 | 260 | 37 | 21 | 271 | 47 | 29 | 279 | 57 | 36 | 286 | 67 | 43 | 293 | 77 | 51 | 301 | 87 | 57 | 307 | 97 | 68 | 318 | This was our original graph‚ it was before we made the trend line go back 311 points to find where the graph intercepts the X axis. As you can see there are little or no error or anomalies in this data and the R2 value came out to be
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The Lost City Hydrothermal Field Revisited Characteristics of Lost City never before seen in the marine environment venting temperatures around 40-91 degrees Celsius metal-poor hydrothermal fluids with high concentratons of dissolved hydrogen‚ methane‚ and other low molecular weight hydrocarbons all driven by reactions in the underlying basement of the ocean at temperatures of around 200 degrees Celsius; happening for more than 40‚000 years Fauna and living species Microbiological communities
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Gallium Gallium was discovered through a spectroscope by a French chemist named Paul Emile Lecoq de Boisbaudran in 1875. The name Gallium comes from the Latin word‚ Gallia‚ which means France. It is also possible that he named it after himself because Lecoq means the rooster in French and the Latin word for rooster is “gallus” but he denied that claim. Gallium is a silvery blue metal with a unique characteristic. It has a melting point of only 85.6 degrees Fahrenheit so it will actually melt
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1. Assume that you have 100 years of continuous temperature records from your local weather service office. Discuss some of the difficulties you might have trying to determine whether average temperatures have increased during this period. 2. What are meant by the terms positive and negative feedback mechanisms? Give an example of a process that would be considered a positive feedback mechanism during a period of warming on the earth. Can you think of a negative feedback mechanism? 3. Discuss
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This experiment will test the suggestion that the enthalpy change between a metal and a solution of a salt is related to the relative position of the two metals in the reactivity. Presumably the further apart in the series the bigger the enthalpy change will be. The experiment is as follows‚ 1) Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s) 2) Zn(s) + Pb(NO3)2(aq) Zn(NO3)2 (aq) + Pb(s) Both of the solutions will be in 1mol.dm-3 Apparatus: Distilled Water Polystyrene Cup
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