Week3Lab

pdf

School

Chamberlain College of Nursing *

*We aren’t endorsed by this school

Course

120

Subject

Chemistry

Date

May 29, 2024

Type

pdf

Pages

Uploaded by CaptainGrasshopperMaster1098

OL Lab 3: Stoichiometry: Avogadro’s number and molecular calculations / Solution Preparation: From salt to solution 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 • Explain relationship between mass, molecular weight, and numbers of atoms or molecules • Perform conversion and derivations calculations using key molecular quantity parameters • Define Avogadro’s number and describe the mole quantification of matter How many moles of sand grains has the Sahara desert? What is the only equation you ´ll ever need in chemistry? The short stoichiometry simulation will help you answer those questions! Follow the footsteps of great chemists and learn about key molecular parameters based on one and only star of chemistry calculations: Avogadro’s Law! Concept mole and Avogadro’s Law: Your first mission in this short simulation is to familiarize yourself with the concept of mole and the way of counting molecules of substances using the one and only Avogadro’s Law. You will learn how to convert huge numbers of particles into handy Avogadro’s number, extensively used by all chemists around the world! Chemical units relationship: Next, you will explore the relationship between mass, molecular weight, and number of atoms. This magical equation will enable you to perform derivations of molecular quantity parameters for various chemical substances. You will feel like Marie Curie analysing chemical dependencies of chemicals in her French laboratory! Part 1: Complete the Labster lab: Stoichiometric calculations: Identify an unknown compound using gravimetric analysis. Glassware and quantitative transfer Moving on to the second workbench, you will explore and determine what glassware will be appropriate for you to use. Your lab guide and mentor, Dr. One, will walk you through

the process of preparing the solution. You will have the freedom to use the equipment as you like, but only by following Dr. One’s instructions will you be successful in making the right solution. To make sure you can always redo the essential steps of the process, Dr. One will provide you with a fantastic reset button, so you can try again if you make a mistake. Solve the preparation In the end, only by carefully ensuring that the right amount of water and ammonium chloride is used can you make the correct solution. Are you prepared for solving how to perform a Solution Preparation? Part 1: Complete the Labster Lab: Stoichiometry: Avogadro’s number and molecular calculations Complete all activities and answer all questions within the lab and then complete the questions below: Purpose: Describe in complete sentences and in your own words, the purpose of this experiment.- - - The goal of this experiment is to understand how to mix the solution properly, the distinction between mass concentration and molarity, and how to prepare the solution. Observations: Record three observations from the simulation. I. Weighing the substance ammonium chloride using a scale II. Move the substance from the measuring dish to the flask by using water III. More water is required to make sure all the substance is used 1. How do you convert between grams and moles of a specific molecule? Give a specific example to illustrate.- - - 1. Divide the grams by the molar mass in order to convert to moles ex: (20g Ca) (1 mol Ca / 40.08g/mol Ca) = 0.499 mol Ca 2. How do you convert between moles of one substance and moles another substance? 1. Write the balanced chemical equation for the reaction 2. Then determine the mole

ratio between each substance 3. Dimensional analysis is used to calculate the moles of substance #1 3. Balance the following chemical equation: Na 2 CO 3 (aq) + CaCl 2 (aq) → CaCO 3 (s) + NaCl(aq) - - - 0.5 moles Na2CO3 * 2 moles NaCl/1 mole Na2CO3 = 1 mole NaCl producing 1 mole of NaCl 4. Use the balanced chemical equation from the last question to solve this situation: You combine 0.5 moles of Na 2 CO 3 with enough CaCl 2 that your compound reacts completely. How many moles of NaCl would you expect this reaction to produce? Show all work below. If you are not sure how to complete this problem, please see the video here: https://care.mediaspace.kaltura.com/playlist/dedicated/ 254042593/1_aw4f9v30/1_4xqaj516 • n N a2CO3 = m/MM (m=mass 0.5g) (MM=molar mass 106g/mol) • n N a2CO3 = 0.5g / 106g/mol = (4.717 x 10^-3mol)(2mol N aCl / 1 mol N a2CO3) = 9.434 x 10^-3 mol N aCl Part 2: Complete the Labster Lab: Solution Preparation: From salt to solution Complete all activities and answer all questions within the lab and then complete the questions below: 1. In this lab, you learned how to prepare solutions with a precise concentration. Where in your nursing career might this skill be needed? As a nurse, you will occasionally need to combine a solute and a solvent if you haven't previously. The ability to correctly combine a solute and solvent when necessary will be aided by this knowledge.

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

2. Which piece of glassware did you use to prepare your solution in this lab and why? I used a volumetric flask because it is precise, and it helps mix the solute and solvent 3. Calculate how many grams of NaCl are required to make 100 mL of a 1 M NaCl solution. Show your work in the space below. M=CVM —> M=(0.1) (58.533)=5.853g Reflection: Consider what you learned from these simulations. Reflect on three to four key concepts that you learned in this lab exercise. How could the lessons learned in this virtual lab relate to a real-world situation in the community/world or your future career? Be specific in your answer (this should require 5-10 sentences). An experiment may be done because the nature of a substance is unknown. The type, weight, and mole count of a chemical may all be determined by experimentation. Because the bottle's label was worn, this experiment demonstrated how to figure out what chemical was in there. There are instances when scientists must do these tests to identify the contents of the bottles due to wear. These models proved useful in demonstrating safe and appropriate experimentation techniques. Grading Rubric: Activity Deliverable Points Part I Complete Simulation Stoichiometry: Avogadro’s number and molecular calculations 10 Part II Complete Simulation Solution Preparation: From salt to solution 10 Part III Complete lab report and answer questions • Observation (3 points) • Purpose (1 point) • Questions (7 points) • Reflection (4 points) 15 Total Complete all lab activities 35

Related Documents

Nutrition 9.docx

MIDTERM Bioc 202 2022 (1).pdf

Lab 4- Column Chromatography and Redox Biochemistry .docx

HIST270 - The Physicists Assignment.docx

DIE 3125 Chapter 2 Worksheet DONEE.docx

CHEM 120 Final Answers - Shshhsjssjjwjsjsvshs.pdf

Lab 6 Notes.docx

Lab 3 notes.docx

Quiz # 2.pdf

chemchpt17AktiveRvw_Unit_9_ANSWERS_new.pdf

homework 3 questions.pdf

Week 5 Lab Worksheet 1.docx

Recommended textbooks for you

Introductory Chemistry: A Foundation

Chemistry

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Cengage Learning

World of Chemistry, 3rd edition

Chemistry

ISBN:9781133109655

Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste

Publisher:Brooks / Cole / Cengage Learning

Chemistry: Principles and Reactions

Chemistry

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:Cengage Learning

Chemistry

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Cengage Learning

Chemistry

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Cengage Learning

Chemistry: Principles and Practice

Chemistry

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Cengage Learning

SEE MORE TEXTBOOKS

Recommended textbooks for you

Introductory Chemistry: A Foundation
Chemistry
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
World of Chemistry, 3rd edition
Chemistry
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Brooks / Cole / Cengage Learning
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Cengage Learning
Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning