Describe the earliest alcohol thermometers. The alcohol thermometers were used because alcohol was lighter then mercury, and expands much more with heat. These Florentine thermometers were usually several meters high, and wound into spirals. The problem was a lack of a universal temperature scale. 7.
Press STOP when the thermograph stabilizes 20. Save that shizzzznit 21. Press DISPLAY to clear previous scan 22. Repeat 11-19 for a second trial | Trial One | Trial Two | Mass of cold water | | | Initial temperature of cold water | | | Mass of hot water | | | Initial temperature of hot water | | | Final Temperature | | | File Name | | | Part B 1. Nest two Styrofoam cups within one another 2.
Acid test= solid + 3M Acetic acid cloudy + 6 ZnO ZnO + Heat yellow Zn Cooled White + ZnCO3 + heat yellow solid. Yellow solid cooled white solid + QUANTITATIVE DATA AND CALUCATIONS Desired Results Calculations Temperature of Water Bath 22.8oC Vapor Pressure (as
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?
We made this inference due to our slope of each of the graphs. Given the mole ratios, the slope of our newer lab, comparing H2 to moles of Mg, should’ve been a slope of 1. But our first point skewed our results giving us an actual slop of 0.7, which was short from a more accurate result. And given our results last week, we concluded that our titration method was more accurate than our crystallization method due to the basically perfect slope of 2.0018 which is very close to the theoretical slope of 2. 5.
Coal hypothesis accept/reject = Rejected The hypothesis was rejected as the pH levels in the water increased when tested. While it was only one level, it was higher than the original sample. 3. Based on your data, what effect do
Name: Daniel Voskresenskiy Post-Lab Report Lab Name: 68th & Zinc - Lab #6 Course: CHEM106 LB SEC: 052 Date: March 18, 2013 Lab Partner: Justin Nus Observations of Reactants (Table 1) Chemical 0.17 M Acetic Acid Buffer 10 Unknown Zinc Compound Physical Appearance Aqueous; clear; colorless Aqueous; clear; colorless; not viscous Fine; Powdery; White; Solid Chemical Zinc Iodide (ZnI2) Calmagite NaEDTA Physical Appearance Solid; powder; fine; white Aqueous; brown/red; not viscous; opaque Fine; Powdery; White; Solid Procedure - Preparing a Solution of EDTA Before titration, a titrant must successfully be made - the substance that will react with zinc ion. Purpose: To find out how much zinc is a sample of zinc iodide we will react zinc
August 23, 2009 Lab Partner-Joey Stabel The Analysis of Alum K.Schuyler Elvir Malikic Purpose Determining and understanding the characteristics of Aluminum Pre-Lab questions 1) When finding a melting point, why is it necessary to raise the temperature very slowly when approaching the melting temperature? When raising the temperature very slowly it gives the thermometer time to display the accurate temperature of the substance giving you a more accurate reading. Another reason would be the visual of things changing in a slower giving you time to examine what’s happening. 2) Washing soda is a hydrated compound whose
The actual Batter temperature is: Walk-In freezer temperature should be 0°F (+/- 10°F). Internal thermometer must be present and in good working condition. (CRITICAL) (HEALTH DEPARTMENT) The actual Walk-in freezer temperature is: Walk-In cooler temperature must be 34°F to 38°F. Internal thermometer must be present and in good working condition. (CRITICAL) (HEALTH DEPARTMENT) The actual Walk-in cooler temperature is: Answer A no no 169 176 NO no A 189 A 216 no NO no A -3 A 36 Earned Points/ Possible points 5.0/5.0 NA 5.0/5.0 5.0/5.0 NA 5.0/5.0 5.0/5.0 Page 1 of 6 07/22/2011 07:01:25 www.nsf.org Audit# - Visit # : 579682 - 387583 8 Swamp/Grill freezer temperature should be 0°F (+/- 10°F).
Na2CO3 (s) + 2HNO3 (aq) → 2NaNO3 (aq) + CO2 (g) + H2O (l) (c) Reaction of aqueous copper(II) nitrate with sodium carbonate. Cu(NO3)2 (aq) + Na2CO3 (aq) → CuCO3 (aq) + 2NaNO3 (d) Reaction of copper (II) carbonate with sulphuric acid. CuCO3 (aq) + H2SO4 (aq) → CuSO4 (aq) + CO2 (g) + H2O (l) 2. Yield of product (a) Mass of CuO used: _4.00 g (b) Mass of CuSO4.5H2O formed:12.00 g (c) Calculation of theoretical yield: No. of moles of CuO = 4g63.55+16=0.0503 moles Hence, no.