LAB Chemistry & Worksheet

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LAB 1 Mineral Composition

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Purpose of Experiment: To use and calculate empirical and molecular formulas.

Go to lab: 

http://chemcollective.org/chem/curriculum/stoich/empform.php

All of the instructions for this lab are located within ChemCollective. You will step through this lab completing different tasks on different pages. At the end of each task, you will see a “Correct” or “Incorrect” screen. You are able to try again if you see an “Incorrect” screen. Be sure to take a screenshot of each “Correct” screen. Submit a zip file of all screenshots for this lab activity.

LAB 2 Gravimetric Analysis

To access your lab, please follow these instructions– *if you have already done steps 1-10, simply log in to view your course and participate in lab activities:

1. Please go to: 

https://oli.cmu.edu/jcourse/webui/register/student.do

 

2. This will bring you to the “Course Key Students” page.

3. Enter the Course Key “GRC19” in the box and click “register.”

4. Create an account by filling in the information (be sure to use an account ID and password you will remember and make a note of it for future logins).

5. Click “I’m not a robot” and “Sign Up.”

6. Confirm your account by clicking on “confirm account.”

7. Read the consent form, then agree by choosing “I agree” and “submit.”

8. Click on “Register” for the Chemistry Virtual Lab Activities with Instructor Sandra Raysor.

9. Click on “Enter course” next to the red arrow to begin the lab.

10. Find the lab required for the assignment and begin work

Module Three Assignment

Name:

Chemical Composition and Calculations

Instructions: Write out a linear equation to answer each question.

1. How many molecules of oxygen are found in 3.00 moles of oxygen?

2. How many grams are in 5.87×1021 molecules of sulfur?

3. How many atoms are found in 4.20 g of magnesium (Mg)?

4. How many atoms are found in 3.45 g of CO2?

Instructions: Calculate the mass percent composition of a compound. Show all of your work.

5. Calculate the mass percent of 0.485 g of H, which reacts with oxygen to form 2.32 g H2O.

6. Calculate the mass percent of manganese (Mn) in potassium permanganate (KMnO4).

Instructions: Calculate the empirical or molecular formula for compounds. Show all of your work.

7. A 2.87 g sample of carbon reacts with hydrogen to form 3.41 g of car fuel. What is the empirical formula of the car fuel?

8. Glucose is a carbohydrate that contains carbon, hydrogen, and oxygen. The empirical formula of glucose is CH2O and its molar mass is 180.12 g/mol. Find the molecular formula of glucose.

Chemical Bonding

Instructions: Draw the Lewis Structures for the following molecules. There are free software programs available online that will allow you draw these structures. You can also use drawing tools on your computer or freehand it, take a picture and insert it into this document.

1. NaCl

2. CH4

3. NI3

4. H2O

Instructions: Draw the resonance structures for the following compounds.

5. SO32-

6. NO3-

Instructions: Give the molecular geometry and the bond angles for the following compounds.

7. H2O

8. CCI4

9. CO2

10. NH3

Instructions: There are various types of covalent bonds. Determine if the following molecules are polar, nonpolar, or ionic compounds.

11. KCI

12. CH4

13. BH3

14. H2O

15. CHCI3

Naming Acids

Instructions: Provide the name of each of the following acids.

1. HBr

2. HF

3. HC2H3O2

4. HNO3

Instructions: Provide the molecular formula for the following acids.

5. Hydrocyanic acid

6. Nitrous acid

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