utilizing an ice bath and a really cool thermometer. Apparatus Procedures Preparing the Ice Bath 1. Fill the tub ¾ full with ice. 2. Cover the ice with a respectable amount of salt. 3. Add water and stir that bad boy‚ the water should be standard temperature in a fwe minutes. Fill the test tube with any amount of water and submerge promptly *Check the test tube every few seconds until frozen. Record temperature. Repeat with both antifreeze solutions Data | Freezing Point (°C)
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H2(g) + MgCl2(aq) Hydrogen gas is produced when hydrochloric acid and magnesium are mixed. The volume of hydrogen gas is found by measuring the volume of the buret after the reaction occurred. The number of moles is found by converting the given amount of grams of magnesium into moles of magnesium using the molar mass and then using the equation to find the number of hydrogen gas mole with a one to one mole ratio. Once finding these two important figures the gas constant
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1. The partial molar volumes of acetone and chloroform are 74.16 cm3 mol-1 and 80.23 cm3 mol-1 respectively. Calculate the volume of a mixture containing 25.00 moles of acetone and 75.00 moles of chloroform. 2. Acetone has a molar mass of 58.1 g mol-1 and a density of 0.787 g cm-3. Chloroform has a molar mass of 119.4 g mol-1 and a density of 1.499 g cm-3. Estimate the volume of the above mixture using this information. 3. Calculate the molal freezing point depression constant Kf for
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Name of the Experiment: Avogadro’s Law Type Your Name: Date: 11/17/13 Experiment 1 ________________________________________ 1. For each gas‚ record the following: Propane Butane Methane a Name and formula C3H8 C4H10 CH4 b Mass of 100 mL gas (g) 0.274g 0.361g 0.100g c Molecular weight of the gas (g/mole) 44.10g/mol 58.12g/mol 16.04g/mol d Number of moles in the 100 mL sample 0.0062mol 0.0062mol 0.0062mol Average of all 3 gases: (0.0062+0.0062+0.0062)
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Colligative Properties & Osmotic Pressure Peter Jeschofnig‚ Ph.D. Version 42-0149-00-01 Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions‚ diagrams if needed‚ and data tables that should be addressed in a formal lab report. The intent is to facilitate student’s writing of lab
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Analysis of a Commercial Bleach Lab Guidelines Name‚ Exp. Name‚ Number‚ Date (we did lab)‚ Partner(s) Purpose Compound Names‚ Formulas‚ and Molar Masses (5 used – no formula or molar mass for starch) Reactions (use the four listed on the front page of the lab) Procedure/Observations Include initial observations and final observations/odors‚ masses of KI… Results (Data Table) Make a table that has your data of KI masses‚ and the three volumes (from the three trials) needed to titrate the
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If an Avogadro number of pennies were distributed evenly among the human inhabitants of earth‚ each man‚ woman‚ and child would have enough money to spend a million dollars every hour—day and night—and still have over half of it unspent at death. One guacamole is the amount of taco chip dip that can be made from an Avogadro number of avocados—plus appropriate quantities of tomatoes‚ onions‚ and chili. A train stretching to the North Star and back 21/2 times would be required to transport one guacamole. Suppose the Greek god Zeus
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Conductimetric Titration and Gravimetric Determination of a Precipitate Objective: * Measure the conductivity of the reaction between sulfuric acid and barium hydroxide * use conductivity values to determine equivalence point * measure mass of a product to determine equivalence point gravimetrically * calculate molar concentration of barium hydroxide solution Procedure: * First‚ combine 10.0 mL of the Ba(OH)2 solution with 50 mL of distilled water. Then‚ measure out 60 mL
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1. The key theme in humanistic therapy is A. emotional expression. B. self-responsibility. C. philosophical reasoning. D. self-criticism. 2. According to psychologist Martin Seligman‚ depression is largely a response to A. learned helplessness. B. manic elation. C. sexual abuse during childhood. D. chronic negative circumstances. 3. For the psychologist‚ abnormal behavior can be thought of as expressing distress of some kind that obstructs one’s ability to function. Because this is such a broad definition
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to the purchases journal & Accounts Payable subsidiary ledger for the correct amounts III. Completeness To determine that purchases that occurred are recorded Trace a sample of vouchers to the purchases journal. Compare the dates on a sample of vouchers with the dates they are recorded in the purchases journal. IV. Valuation or Allocation To determine that purchases that are recorded for the proper amounts. Vouch selected purchase transactions recorded in the purchases journal to the
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