Chem 103 lab exam 3 Study guides, Class notes & Summaries

Chem 103 portage learning Lab Exam 3

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...

Oxygen, O2 - ANSWERis a colorless, odorless gas that supports combustion. A glowing splint will brighten or burst into flame when thrust into the conatiner. Hydrogen, H2 - ANSWERis a colorless, odorless gas that burns in air. It is less dense than air and can be captured in an inverted vessel. A confined mixture of this and air (in an inverted test tube) will ignite with a "pop" when exposed to a flame. By contrast, pure __ will burn quietly with a blue flame if it replaces natural gas in a...

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.

CHEM 103 Lab Exam 3 – Portage Learning. Why was the crucible cooled in a desiccator? 2. With what was the sample coated in the SEM experiment? 1. The crucible cooled in a desiccator to prevent water from being picked up. 2. The sample was coated with carbon in the SEM experiment. Answer the following question. 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 t...

The sample was coated with carbon in the SEM experiment. Answer the following question. 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,...

CHEM 103 LAB EXAM 3 QUESTIONS AND ANSWERS Question 110 / 10 ptsScientific Calculator Answer the following two questions: 1. Why was H2SO4added to the metal carbonate in part 1 of lab 3? 2. Why were gloves used during the ninhydrin spray procedure? 1. H2SO4was added to the metal carbonate in lab 3 to cause the loss of CO2 2. Gloves were used during the ninhydrin spray procedure to prevent the reagent from reacting with the dead skin amino acids and causing purple marks on the skin. ...

CHEM 103 Lab Exam 3 (100 out of 100) Questions and Verified Answers | Portage Learning

CHEM 103 Lab Exam 3 (100 out of 100) Questions and Verified Answers (Portage Learning)

CHEM 103 Lab Exam 3 (LATEST UPDATE) Questions and Verified Answers (Portage Learning).