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=?
Nest one Styrofoam cup in another 11. Obtain an exact mass of tap water (45-50g) to serve as cold water 12. Put a magnetic stirrer in the bottom of the calorimeter 13. Secure temperature probe to a ring stand 14. Place temperature probe through hole in cardboard lid and position probe about 1cm above bottom of calorimeter 15.
Juliana Park Mayumi Tamada CHEM 111B LAB/ M-F 1-4PM 15 August 2012 Spectroscopy Lab Introduction In this lab, the molar absorptivity of the complex FeLn2+ will be determined by using the absorbance of the complex and its concentration. The absorbance will be found by using a spectrophotometer. For the next part of the lab, the formula of the complex will be determined by also using the volume of ligand and the absorbance again. Experimental There are two different parts to the experiement. In the first part, five 100 mL flasks of 5 mL ligand solution, 5 mL 2 M sodium acetate, 4 mL 3 M NH2OH, and 1-5 mL Fe2+ solution are diluted with water.
What is the molar mass of the antibiotic? Show your work. Data Table 2. Temperature Readings for Freezing Point Time (seconds) |Temp (°C) of control (tap water) |Temp (°C) of solution + 0.5 tsp (~2.5 mL) salt |Temp (°C) of solution + 1.0 tsp (~5 mL) salt | 30 |5|5|2| 60 |5|6|2| 90 |5|4|2| 120 |5|3|2| 150 |5|3|2| 180 |5|3|2| 210 |5|3|2| 240 |5|3|2| 270 |5|3|2| 300 |5|3|2| 330 |5|3|2| 360 |5|3|2| 390|5|3|2| 420 |5|3|2| 450 |5|2|2| 480 |5|3|2| 510 |4|3|2| 540 |4|3|2| 570 |4|3|2| 600 |4|3|2| www.HOLscience.com Colligative Properties and Osmotic Pressure Questions | A. Describe the three freezing points.
Title: 1pt Stoichiometry Of A Precipitation Reaction 2. Procedure: 2pt (Write the procedure in your own words after you have read the lab manual) Put on goggles the weigh 1.0 of CaCl*2H2O and put it in 100ml beaker. Add 25 mil of water and stir. I will then use stoichmetry to figure out how much Na2CO3 I will need for a full reaction. I will weigh this and put it in a separate cup.
Laboratory Techniques and Measurements – Lab Report Assistant Exercise 1: Length, Temperature, and Mass Data Table 1. Length Measurements Object Length (cm) Length (mm) Length (m) CD or DVD 11.7 116.8 0.1 Key 6.1 61.0 0.1 Spoon 14.5 144.8 0.1 Fork 17.0 170.2 0.2 Data Table 2. Temperature Measurements Water Temperature (°C) Temperature (°F) Temperature (K) Hot from tap 65.1 149.2 338.3 Boiling 97.5 207.5 370.7 Boiling for 5 minutes 100.0 212.0 373.2 Cold from tap 23.0 73.4 296.2 Ice water – 1 minute 7.8 46.0 281.0 Ice water – 5 minutes 4.0 39.2 277.2 Data Table 3. Mass Measurements Object Estimated Mass (g) Actual Mass (g) Actual mass (kg) Pen or pencil 7.5 10.7 0.01 3 Pennies 8.0 7.4 0.007 1 Quarter 3.0 5.6 0.006 2 Quarters, 3 Dimes 15.7 18.2 0.02 4 Dimes, 5 Pennies 20.9 21.5 0.02 3 Quarters, 1 Dime, 5 Pennies 29.4 31.7 0.03 Key 8.6 10.0 0.01 Key, 1 Quarter, 4 Pennies 25.0 25.7 0.03 Questions: A) Water boils at 100°C at sea level. If the water in this experiment did not boil at 100°C, what could be the reason?
When an electrolyte or non electrolyte is introduced the effectiveness of the Boiling point changes. III. Data Table A. Boiling points of the solution Solution- NaCl + H2O Temperature measured for 30 Seconds Trial 1 101.3 ̊ C Trial 2 101.7 ̊C Trial 3 102.5 ̊̊C Average of trials 101.8 ̊C IV. Computations A. Calculations in Lab Writeup 1.
| | | An Activity Series 1/9/13 Makieya DunhamPartners: Jasmine Lewis and Danielle Anderson | | | Problem Statement: In this lab we determined the activity series for five metals and for three halogens. In the first part of the lab we used a microscale technique to rank the metals that reacted with the other metal nitrates from most reactive to least reactive. The metal that reacts with another metal nitrate, then the solid metal have reduced the other metal ion and is the more reactive metal of the two. In the second part of the lab we used the solvent extraction technique to derive an activity series for the halogens. Safety Precautions: When in the lab we wore goggles, an apron, and gloves the entire time.
Heat is released when combustion occurs in the calorimeter, causing a rise in the temperature of the water. The change in temperature can be used to calculate the amount of heat energy. Materials (Experiment A + Experiment B) * Thermometer * Glass stirring rod * Styrofoam cover * 400 mL beaker * Water * 2 Polystyrene cups * Unknown metal * Test tube * Stopper * 50 mL of HCL * 50 mL of NaOH Procedure Part A
CMY282 EXPERIMENT 5 ANSWER SHEET PARTIAL MOLAR VOLUMES Name: …………………………..……………… Student number: …………………………..…………….… Title: Abstract: Results 1. Volume calculations Temperature: ρw = (from Table 6-1) Table 6-2: Calculation of volumes of water and ethanol Xw XE Vw (cm3) VE (cm3) 1 0.8 2 0.6 3 0.4 4 0.2 2. Preparation of the liquid mixtures and calculation of their exact mol fractions Table 6-3: Calculation of the composition of the actual samples Empty Flask m0 (g) Flask + W mA*(g) Flask + W + E mB*(g) mA* - m0 mw (g) mB* - mA* mE (g) mw/Mw nw (mol) mE/ME nE (mol) nE/(nw+nE) XE Water - - - - - - - 0 1 2 3 4 Ethanol - - - - - - - 1 3. Determination of the volume of the pycnometer Mass of empty pycnometer: g Temperature of the waterbath: ____ C Mass of full pycnometer: g .̇. Mass of the water: g .̇.