Chemistry Procedures  

Laboratory experiences and use of your text, Addison-Wesley Chemistry, will aid you in learning chemistry, and enrich your life through a better understanding of the complex issues and choices you face in a scientific and technological society.

Students are to:

  1. Bring your covered textbook, notebook, lab book, pencils, eraser, paper, 15 cm ruler and a 5 function, or more, nongraphing calculator. Use pencils only in class.
  2. Keep a chemistry notebook with these sections: reference, class notes, reading notes, homework and graded labs.
  3. Be knowledgeable of assignments, labs, and test and quiz dates from the calendar.
  4. Complete sentences are used for all written work, with a noun for the subject.
  5. Follow the posted Chemistry Lab and Classroom Procedures

Chemistry Lab

            Science is the result of honest observations made during experiments. Study the lab. Most labs demonstrate the ideas discussed in preceding sections. Determine the lab purpose so you may make proper observations as they occur. Proper materials preparation and labeling and careful procedures lead to improved results. Be honest in reporting your results. Lab write-ups will be completed in the Lab Notebook. Each lab write-up is worth 100%. Points are deducted when the following are missing:

  1. Sate your name, period, date, the lab name, and purpose. (5 pt each)
  2. Use a pencil and ruler to neatly draw all lines in tables and graphs. (5 pt)
  3. Title all graphs as to the relationship they display. (5 pt)
  4. Label every quantity expressed on both axes of graphs. (1-2 pts, up to 20 pt)
  5. Chemical reactions are expressed in equations which are legible, balanced, written on one line, and may note the state (s, l, aq, g). (5-10 pt)
  6. Express numerical data in decimal scientific notation where applicable. (5 pt)
  7. Calculations must follow this pattern:
    1. A word equation or model: calories m (t1 t2) x calorie per gram (5 pt)
    2. Substitute values and labels: calories = 40g (32C-24C) x 1 cal/ gram (5 pt)
    3. Calculated answer with labels and notation: calories = 3.2 x 10 cal (5 pt)
  8. Complete sentences are used with a noun for the subject. (5 pt)

Lab write-ups are due by the tardy bell at the beginning of the period.

Parental excused absences may follow a lab make-up with your teacher with one week of your return to class. The lab write-up will be submitted for grading at the beginning of the class period following the make-up. Keep your graded work in a safe place to verify scores and earn extra credit.

  Classroom/Safety Procedures:

  1. Be on time, in class and prepared; do your best, respect, do not disturb others.
  2. Store personal items and backpacks on the shelf under the lab bench at all times.
  3. Stay in your area. Only the designated leader may leave to get or return materials.
  4. Study, listen to and follow directions. Ask questions after the Introduction.
  5. During lab work tie back long hair, clothing or jewelry. Wear safety goggles and lab aprons. Never handle any equipment unless you have specific permission and knowledge of its use. Never eat or drunk in the laboratory, never drink from the lab glassware or tase any chemical.
  6. Use only those chemicals needed in the activity. Keep all lids closed when a chemical is not being used. Never use broken or chipped glassware. Report spills, breakage or accidents to your teacher immediately. Dispose of all chemicals as instructed by your teacher. To avoid contamination, never return chemicals to their original containers unless directed to do so. Dispose of all organic solvents in the organic waste container in the lab preparation room; do not pour them down the sink.
  7. Know how to light and operate a Bunsen burner. Keep all materials away from flame. Never reach across a flame or heat any chemical that you were not instructed to heat. Never heat a liquid in a closed container or leave a lighted burner unattended. Always point a test tube or other open container away from you and others.
  8. When instructed to note an order during an experiment, gently wave your hand over the container and direct some fumes toward your nose.
  9. Be especially careful with acids or bases. Should any chemical get on your skin or clothing immediately rinse with water and notify teacher. Wash your hands before and after each experiment.
  10. When an experiment is completed, clean up your work area and return all equipment to its proper place.

Do your work. Honesty is required on your assignments. Dishonesty earns a zero.

            Grades are recorded as percentages and calculated as follows:

                        Tests                40%                 A             90-100%

                        Labs                 25%                 B             80-89%

                        Quizzes             20%                C             65-79%

                        Homework       15%                 D             55-64%

                                                                         F             0-54%

I have read and understand our class procedures. ______________________________________

                                                                                                (Name, Date, Book #)