Chemistry > EXAM > CHEM 120 Unit 3 Lab: OL Lab 5: Stoichiometric Calculations: Identify Unknown Compound Using Gravimet (All)
CHEM 120 Unit 3 Lab: OL Lab 5: Stoichiometric Calculations: Identify Unknown Compound Using Gravimetric (GRADED A)
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CHEM 120 OL, Week 3 Lab: OL Lab 5: Stoichiometric Calculations; Identify an Unknown Compound Using Gravimetric Analysis Learning Objectives: Explain the relationship between mass, molecular weight... , and numbers of atoms or molecules and perform calculations deriving these quantities from one another Perform mass-to-mass stoichiometric calculations via conversions to moles Identify the limiting and excess reagents in a chemical reaction Calculate the theoretical, actual and percent reaction yield Define Avogadro’s number and describe the mole quantification of matter Introduction: Did you know that there are more water molecules in a glass of water than there are sand grains in the Sahara desert? In this simulation you will learn about the relationship between mass, molecular weight and the number of atoms or molecules. You will understand the magnitude and importance of Avogadro’s number. Identify an unknown compound In order to identify a compound where the label has been partly destroyed, you will apply the technique of gravimetric analysis. To do so, you must first learn to understand the relationship between mass, moles and molecular weights and how to perform stoichiometric calculations from mass to mass via conversions to moles. Stoichiometric calculations with moles You will perform a realistic gravimetric analysis with detailed instructions on what to do and why to do it in every step of the experiment. From balancing the equation to recognizing the stoichiometry of the reactants and finding out which equation to employ in the calculations you will identify of an unidentified compound. What compound is it? At the end of the simulation, you will have finalized all of the stoichiometric calculations and the answer to the question should be clear… Can you see what compound it is? Part 1: Complete the Labster lab: Stoichiometric calculations: Identify an unknown compound using gravimetric analysis Part 2: Report and Reflection Purpose: Describe in complete sentences and in your own words, the purpose of this experiment. Observations: Record three observations from the simulation. Answer the questions below How do you convert between grams and moles of a specific molecule? Give a specific example to illustrate. How do you convert between moles of one substance and moles another substance? Balance the following chemical equation: Use the balanced chemical equation from the last question to solve this situation: You combine 0.5 grams of Na2CO3 with excess CaCl2. How many grams of NaCl would you expect this reaction to produce? Show all work below. Review the objectives of this lab and reflect on four key concepts that you learned in this lab exercise. As part of your reflection, describe the process of using a balanced chemical equation to convert from grams of one chemical substance to grams of another chemical substance that appears in the chemical equation. Be specific in your answer (this should require 10-14 sentences). [Show More]
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