CHEM 120 DeVry Week 3 iLab latest

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CHEM 120 DeVry Week 3 iLab Latest


CHEM 120 DeVry Week 3 iLab Latest

iLab 3 of 7: Atomic Weight of Magnesium

For this week’s lab, you will conduct the following Model ChemLab experiment: Atomic Weight of Magnesium. This experiment will utilize the stoichiometric information found in a balanced chemical equation. As you prepare to conduct this experiment, analyze the reaction that you will study.

Mg + 2HCl –> H2 + Mg2+ (aq) + 2Cl- (aq)

Given this information, you will identify that the moles of H2 evolved = moles of Mg consumed.


NOTE – Submit your assignment to the Dropbox, located at the top of this page. For instructions on how to use the Dropbox, read these step-by-step instructions. (See the Syllabus section “Due Dates for Assignments & Exams” for due dates.)

For each lab experiment, you will write a laboratory report. Download the iLab Week 3 Report Template. In your lab report, you should include the information below.

Title Introduction:

The first section of your lab report will be the introduction. In this paragraph(s), you are to provide information to the reader so that he or she can understand the purpose of the experiment.


This is a concise statement about the lab’s objective.


This is a brief summary of the topic you are investigating. Include any information that would be necessary to understand the stated purpose.


State the major results of the lab exercise.


This is the second section of your lab report. This section includes information that the reader would need in order to repeat the experimental procedure. Do not include any observations or results in this section. Some questions that you should ask yourself to complete this section include: What chemicals did I use? What equipment did I use? How much of each chemical did I use? How long did I perform a step within the procedure?

Observations and Results:

This is the third section of your report. In this section, you will communicate what you observed during the experiment. The Results section is typically dominated by calculations, tables, and figures. In your tables, label the axes of any graphs.


This is the fourth section of your report. In this section, you will explain, analyze, and interpret what you observed. You will draw conclusions from what you know. This is also where you show the reader that you understand the significance or meaning of the results.


This is the last section of your report and is separate from the Discussion section. In a few sentences, provide a concluding statement about the results of your laboratory. In a scientific publication, this section summarizes the significant aspects and results and identifies implications for future study.

Required Software

Model ChemLab v 2.4

Access the software at Steps: All

Grading Rubric

Category Points Description
Introduction 5 The background material is complete.

Does the description set the stage for the reader?

Procedure 5 The lab report follows correct and complete procedures.
Observations and Results 5 Were the results accurate? Were all results included?
Discussion 5 Was an interpretation of the results included?
Conclusion 5 Was a concluding statement included?
Writing Quality 5 The lab report contains correct grammar, spelling, originality, completeness, and so forth.
Total 30  


A laboratory report will meet or exceed all of the above requirements.

Lab Steps

STEP 1: Access Model ChemLab Software

Log into the lab software by clicking the Connect to the iLab Here link, provided at the top of this page. Follow the information to log into the lab environment that can be found in the iLab section under Course Home.

Select Model ChemLab v 2.4. Once the application loads, select the Atomic Weight of Magnesium Lab and click OK.

For an overview of the Model ChemLab software, and navigation within the program, view the following orientation tutorial:


Cell StructureModel ChemLab Tutorial

This tutorial gives an overview of the Model ChemLab software and navigates within the program. Duration: 01:31 minutes

STEP 2: Conduct Experiment

Step 1: Obtain a 600 mL beaker, and add 300 mL of water.

Use the Equipment selection from the toolbar.

Select 600 mL beaker from the choices for beaker.

Right-click on the beaker. Select Water.

Using the dropdown menu, select 300 mL Water. The beaker will now be half full with water, shown by the white shaded area.

Step 2: Add 30 mL of HCl (2M) to the beaker, and stir.

Right click on the beaker, and select Chemicals.

Select 2M HCl.

Change the volume to 30 mL.

Click OK. You will see the volume in the beaker slightly rise.

Step 3: Add 10 mg of magnesium metal to the beaker.

Right-click on the beaker, and select Chemicals.

Select Magnesium.

Change mass to 10 and g to mg.

Click OK. You will see a shaded area appear on the bottom of the beaker.

Step 4: Allow the hydrogen gas to evolve.

All of the magnesium should be consumed. You will see bubbles appear. Watch for the bubbles to stop.

The shaded area will have faded from the beaker. This shows that the magnesium has been consumed.

Step 5: Record the amount of hydrogen gas that has evolved using the chemical property dialog.

Right-click on the beaker, and select Chemical Properties.

Record the amount of hydrogen gas (mol) that has evolved.

Note about scientific notation: If you were to read in the Chemical Properties dialog box that 5.345e-004 moles had evolved, this is the same as 5.345 x 10-4 moles.

STEP 3: Write Lab Report

Follow the directions above to write your lab report. Use the Lab Report template that is provided above.

In your lab report, include the following information in the Discussion section.

Record the moles of hydrogen gas that has evolved.

Calculate the atomic weight of magnesium as follows.

atomic weight of Mg (in grams) = weight (in grams) of Mg consumed/moles of H2 evolved

Discuss the stoichiometry of the chemical reaction that you are studying.

Mg + 2HCl –> H2 + Mg2+ (aq) + 2Cl- (aq)

How does the information in the balanced chemical equation above help you determine the atomic weight of magnesium?

Discuss how the calculated atomic weight of the magnesium compare to information found on the periodic table of elements.