Chem 103 lab Study guides, Class notes & Summaries

CHEM 103 Lab Exam 4 – Portage Learning. Does the following reaction give off heat or absorb heat? Explain briefly. C D H = +263Kcal/mol 3. (4 points) In one experiment in the video, room temperature water was mixed with water at about 38 degrees. To what temperature (about) did the mixture of the two water samples come to after setting for a few minutes? Answer: 1. The heat depends on the amount of substance. If the amount of substance is doubled, then the heat doubles. Other propertie...

The unit “m” stands for _______ in this experiment. 2. (4 points) Why was warming data used for estimating the freezing/melting point of the cyclohexane? 3. (3 points) How much of the cyclohexane solvent was placed in the test? 1.) molarity 2.) It is considered reliable. It is a dependable predicator of the freezing/melting point of a substnace. it can determine the temperatures when the change occurs. 3.) 10 mL of cyclohexane 1. molality 2. Solids tend to supercool, which gives fa...

CHEM 103 Lab Exam 3 – Portage Learning. A 1.1000 gram hydrate sample chosen from Na2CO3∙10H2O, AlCl3∙6H2O, MgCl2∙6H2O and BaCl2∙2H2O was heated and found to lose 0.5841 gram of H2O. (1) Show the calculation of the % H2O in the unknown hydrate sample. (2) Show the calculation of the % H2O in each of the hydrate compounds and identify the unknown hydrate from the list. Atomic weights: H = 1.008, O = 16.00. MWs: Na2CO3∙10H2O = 286.15, AlCl3∙6H2O = 241.43, MgCl2∙6H2O = 203.301 ...

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Chemistry Lab Report Experiment #: 8 Title: Molecular Mass Purpose: Estimation by freezing point depression. Procedure: 10.0 mL of cyclohexane is measured; this is the solvent. The cyclohexane is then transferred into a test tube. The test tube is fitted with a special stopper and there is a special hole that has a wire to help stir and is also fitted with a thermometer. The test tube is then inserted into a beaker containing a mixture of ice and salt, this creates a cold bath. The salt i...

CHEM 103 LAB 3 Quantitative & Qualitative analysis entry notebook CHEM 103 LAB 3 Quantitative & Qualitative analysis entry notebook CHEM 103 LAB 3 Quantitative & Qualitative analysis entry notebook

CHEM 103 LAB 3 Quantitative & Qualitative analysis entry notebook CHEM 103 LAB 3 Quantitative & Qualitative analysis entry notebook