# Buy Guided CHEM120 Unit 3 Labs: OL Lab 5 and OL Lab 6

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## Buy Guided CHEM120 Unit 3 Labs OL Lab 5 and OL Lab 6

##### 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.

1. How do you convert between grams and moles of a specific molecule? Give a specific example to illustrate.
2. How do you convert between moles of one substance and moles of another substance?
3. Balance the following chemical equation:
4. 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.
5. 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).

##### CHEM 120 OL, Week 3 Lab: OL Lab 6: Solution Preparation; From Salt to Solution

Learning Objectives:

• Prepare an aqueous solution of a specific concentration from a pure salt
• Correctly use an analytical balance, a volumetric pipette, a volumetric flask, and a measuring cylinder
• Explain the relationship between molarity and mass concentration

Introduction
Prepare to become a solution champion! In this simulation, you will complete all the steps involved in preparing an aqueous solution of a given molarity from ammonium chloride – a water-soluble salt.

Use that balance
Your first mission will be to determine the exact amount of ammonium chloride needed for your solution. When the calculations are completed, you will move to your first workbench, where you’ll find an analytical balance. You will use this high-precision instrument to obtain just the right amount of the substance. It’s a tricky procedure, but you’ll have unlimited time and attempts to get it right.

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: Solution Preparation: From salt to the solution

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.

1. In this lab, you learned how to prepare solutions with a precise concentration. Where in your nursing career might this skill be needed?
2. Which piece of glassware did you use to prepare your solution in this lab and why?
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.
4. Reflection: Consider what you learned from this simulation. 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).

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