Reactions Lab David Vaghari INSTRUCTOR: Dr. Chernovitz Monday, July 23, 2012 Oxygen Production Introduction In this lab, potassium chlorate will be decomposed producing oxygen gas and potassium chloride. The hypothesis is that the reaction will yield 3.916 grams of oxygen gas. Materials Test tube 10 grams potassium chlorate Bunsen burner Procedure Step 1. Obtain a test tube, place a 10 gm of potassium chlorate. Step 2.
Chem 112 Assignment for Chapter 19 1. Calculate ΔS° values for the following reactions by using tabulated S° values from Appendix B (Petrucci text) a) N2H4 (g) + H2 (g) → 2NH3 (g) b) 2Al (s) + 3 Cl2 (g) → 2 AlCl3 (s) c) Mg(OH)2 (s) + 2 HCl (g) → MgCl2 (s) + 2 H2O (l) d) 2 CH4 (g) → C2H6 (g) + H2 (g) 2. Use data in your Appendix B to find ΔH° and ΔS° values at 25°C to calculate ΔG° where ΔG° = ΔH° - T ΔS° for each of the following reactions. a) Ni (s) + Cl2 (g) → NiCl2 (s) b) CaCO3 (s, calcite) → CaO (s) + CO2 (g) c) P4O10 (s) + 6 H2O (l) → 4 H3PO4 (aq) d) 2 CH3OH (l) + 3 O2 (g) → 2 CO2 (g) + 4 H2O (l) Note: the following values ΔHf° (kJ/mol) S° (J/K) Ni (s) 0 29.9 NiCl2
pyridinium hydrobromide perbromide type of stationary phase column length column temperature rate flow of the carrier gas List the 4 general factors that affect the separation obtained on a gas chromatograph What specific technique is used to collect/isolate your purified unknown compound at the end of the recrystallization experiment? suction filtration 14 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA
of mixture Metal C 25.605g 24.6mL 25.2°C 100.5°C 28.7°C Calculations: Show your work and write a short explanation with each calculation. Part I: 1. Calculate the energy change (q) of the surroundings (water). We can assume that the specific heat capacity of water is 4.18 J/ (g · °C), and the density of water is 1.00 g/mL. (4 points) q = m × c × Δt Given: q=?
L a n d o l t C l o c k A B S T R A C T An experiment was designed to see if the Landolt iodine Clock is an elementary reaction or not. This was achieved by finding the four unknown variables (α, β, A, and Ea) for the reaction of 2I- + S2O32- → I2 + 2SO42-, which comes from the two reactions that drive the Landolt Clock: I2 + S2O32- → S4O62- + 2I- and I2 + starch → I2 • starch complex. α and β were found experimentally by changing the concentrations of KI(aq) and (NH4)S2O8(aq)—solution’s concentration was held constant while the other was doubled; both variables were found to be roughly equal to 1. Variables A and Ea were found by keeping the concentration of all solutions constant while changing the temperatures. Using a graph of ln(K) vs. 1/T, Ea was found to be .00426 KJ/mol and A was found to be 2.4033 s-1.
Chemistry lab report 28th of Sep 2009/ Monday Aya Naji Shnawa Experiment 1.3 An acid base titration *data collection and processing *conclusion and evaluation DATA COLLECTION AND PROCESSING: Readings 1st trail 2nd trail 3rd trail 4th trail Average Initial ±0.05cm 3 0.0 0.0 0.0 0.0 0.0 Final ±0.05cm 3 20.5 21.5 21.0 21.1 21.0 Table 1.1: a presentation of processed data in all the trails. ________________________________________ The experiments The difference 1st to 2nd 1.0 2nd to 3rd 0.5 3rd to 4th 0.1 Table1.2: the difference of the final readings between the experiments ________________________________________ The average Standard deviation 21.0 0.4 Table1.3: the difference between average and standard deviation. ________________________________________ The sum of the difference The average 1.6 0.5 Table 1.4 the average of the difference. PRESENTATIONN OF DATA: Chart 1.1: the final readings of each of the four trails. ________________________________________ Chart 1.2: the difference between the readings in each of the trails.
5.04H: Gas Stoichiometry Lab Worksheet Name: _________________________ Data and Observations: Present all relevant data in a data table below. Include an observations section for any observations that you made during the lab. (5 points) Data Table| Mass of magnesium strip (grams)|0.0304g| Volume of gas collected (mL)|10ml| Barometric pressure (atm)|1.1| Room Temperature (°C)|21 | Vapor pressure of the water (torr)|18.7| Calculations: 1. Write the balanced equation for the reaction conducted in this lab, including appropriate phase symbols. (2 points) Mg(s) + 2 HCl(aq) → H2(g) + MgCl2(aq) 2.
Physics 1408 Section E1 Standing Waves in a Vibrating Wire Callie K Partner: Miguel E Date Performed: March 20, 2012 TA: Raziyeh Y Abstract This lab had two purposes. The first was to determine the relationship between the length of a stretched wire and the frequencies at which resonance occurs. The second was to study the relationship between the frequency of vibration and the tension and linear mass density of the wire. In the first part we found the resonance, frequency and wavelength of a wire and used this data to calculate the speed of the traveling waves. For first harmonic, our wavelength was 1.200 m, found by the formula λ=2L/n.
Empirical formula: CH5N Steps for molecular formula: 1- Calculate the molar mass of the empirical formula. 2- Divide the known (given) molar mass by the calculated empirical formula molar mass to get a whole number 3- Multiply that whole number through subscripts of the empirical formula to obtain the molecular formula. Example CH5N 12.01 g C x 1 C= 12.01 g/mol 1.008 g H x 5 H = 5.040
Observations & Questions A. Calculate the initial and final concentrations as needed to complete Tables 1 and 2. B. Calculate the average reaction time for each reaction by adding the times for the two trials and dividing by 2. Data Table 1: Varying the Concentration of 1.0 M HCL ---- C o n c e n t r a t i o n s ---- # drops # drops # drops Initial Initial Final Final Reaction Time (sec) Reaction Well # HCl Water Na2S2O3 HCl Na2S2O3 HCl Na2S2O3 Trial 1 Trial 2 Average Rate (sec-1) 1 12 0 8 1M 0.3M 0.5M 0.3M 48 46 47 0.021 2 6 6 8 0.5M 0.3M 0.3M 0.3M 57 56 56.5 0.018 3 4 8 8 0.33M 0.3M 0.20M 0.3M 65 61 63 0.016 Data Table 2: Varying the Concentration of 0.3 M Na2S2O3 ---- C o n c e n t r a t i o n s --- # drops # drops # drops Initial Initial Final Final Reaction Time (sec) Reaction Well # HCl water Na2S2O3 HCl Na2S2O3 HCl Na2S2O3 Trial 1 Trial 2 Average Rate (sec-1) 1 8 0 12 1M 0.3M 1M 0.18M 32 31 31.5 0.032 2 8 6 6 1M 0.15 1M 0.09M 81 80 80.5 0.012 3 8 8 4 1M 0.1 1M 0.06M 135 136 135.5 0.0074 C. Calculate the reaction rate by taking the inverse of the average reaction time, i.e., 1 divided by