Mr. Kovall’s Neighborhood

Return to Chem I Home Page

Chapter 2 - Chemistry Links on the World Wide Web

Chapter 2: Measurements and Moles

1. Metric System

a. Prefixes

http://members.tripod.com/~EppE/metric.htm - Metric prefixes are listed.

http://www.chemtutor.com/unit.htm#eng – Another list of metric prefixes with corresponding symbols.

b. Derived Units

c. Conversions

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank1.htm (Ohio State University, Undergraduate Chemistry Department). Click on “English-metric Conversions - Two and Three Dimensions” for an interactive quiz. Also, click on “Volume Determination by Dimensions of Objects Using the Metric System”. Click on the next seven quizzes that relate to mass, volume, and density.

2. Significant Figures

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank1.htm (Ohio State University, Undergraduate Chemistry Department). Click on each of the first four quizzes, which test your ability to identify the number of significant figures, add/subtract with significant figures, multiply/divide with significant figures, and use significant figures in combined math operations.

The following pages belong to Fordham Preparatory School in New York. Each is a quiz containing several problems, with the answers included at the bottom of the set of problems:

Counting significant digits: Worksheet 23a, 23b, 23c, 23d, 23e, 23f, 23g, 23h, 23i.

Adding/subtracting with significant digits: Worksheet 23j, 23k, 23q, 23r, 23s.

Multiplying/dividing with significant digits: Worksheet 23l, 23m, 23n, 23o, 23p.

http://chemsite.lsrhs.net/chem2_2004/chem2_2004Frameset.html (Lincolon-Sudbury H.S., Mass.) - This page provides useful reminders when considering significant figures when performing math operations.

http://chemsite.lsrhs.net/b_measurement/calcwithsigdigflash.html - This page offers an interactive quiz on the use of significant figures.

3. Rounding

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank1.htm (Ohio State University, Undergraduate Chemistry Department). Click on “Rounding Off” for an interactive quiz on rounding.

4. The Mole/Avogadro’s Number

http://www.sciencebyjones.com/PDF%20files/Moles%20Notes1%20PDF.pdf (Daniel H.S., S. Carolina) – This page discusses in depth “the mole”.

http://www.ucdsb.on.ca/tiss/stretton/chem1/mole2.html (Upper Canada School District) – This page also defines the mole.

http://www.ucdsb.on.ca/tiss/stretton/chem1/avogad1.html - This page helps you to visualize the magnitude of Avogadro’s Number, 6.022x10²³.

5. Molar Mass

a. Formula Weight Determination

http://www.chem.vt.edu/RVGS/ACT/notes/molar_mass.html (Roanoke Valley Governor's School) The “Check Your Calculations” calculator at the bottom of the page allows you to type in the formula of any compound and will calculate the formula weight for that compound. The calculator is not limited to the list of compounds listed.

http://www.carlton.srsd119.ca/cgi-win/mmcalc.exe (Carlton Comprehensive H.S., Canada) - Follow the directions for entering the formula of any compound; the “Formula Mass Calculator” will give you that compounds formula mass.

b. Mole/Atom, Mole/Mass

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank2.htm (Ohio State University, Undergraduate Chemistry Department). This site offers several interactive quizzes involving conversion problems. Click on "Mole Concept - Moles of One Type of Atom in a Mass of a Compound”, “Mole Concept - Total Number of Moles of Atoms in a Compound”, “Mole Concept - Comparison of Different Samples”, “Mole Concept - Grams of Sample Given Number of Moles”, “Mole Concept - Moles Given Grams of Sample”, “Mole Concept - Comparison of Moles of Atoms in Compounds”.

6. Percent Composition

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank2.htm (Ohio State University, Undergraduate Chemistry Department). Click on “Calculate Percentage Composition from Formula” for an interactive quiz.

The following pages belong to Fordham Preparatory School in New York. Each is a quiz containing several problems, with the answers included at the bottom of the set of problems: Worksheet 58a.

7. Empirical Formula/Molecular Formula

http://www.chem.vt.edu/RVGS/ACT/notes/TheMole_files/frame.htm. Discusses Mole, Molar Mass, Empirical/Molecular Formulas

http://lrc-srvr.mps.ohio-state.edu/under/chemed/qbank/quiz/bank2.htm (Ohio State University, Undergraduate Chemistry Department). These quizzes allow you to practice determining a compound’s empirical formula. Click on “Empirical Formula Determination – Plastics”, “Empirical Formulas - Misc. with Two Elements”, “Empirical Formula - Misc Containing Three Elements”, “Empirical Formula - Combustion Analysis of Compounds of C, H and O”.

The following pages belong to Fordham Preparatory School in New York. Each is a quiz containing several problems, with the answers included at the bottom of the set of problems: Worksheet 59a.