Monday, Aug. 26 th : “A” Day Tuesday, Aug. 27 th : “B” Day Agenda Collect safety agreements/pass back safety tests Consequence Report/Lab equipment handout Lab write-up format/evaluation rubric Lab handout/discussion/write-up Safety project work time - due NEXT class period! We will be in the lab NEXT class period – be sure to dress appropriately… NO FLIP-FLOPS!!! Get SSA signed and turned in or you won’t be allowed in lab!
Lab Consequence Report As chemistry students, you must know that absolutely no unsafe activity will be tolerated in the lab! If you are asked to leave the lab, you will be required to complete a lab consequence report before being allowed back into the lab. You will receive a zero on the lab. Your parents/guardians will be notified.
Lab Folders All lab write-ups and handouts will be kept in a separate, folder. The folder will begin with a table of contents that’s updated as new labs are added. Lab procedures will be passed out before the lab so that you will have time to complete the lab write-up prior to conducting the lab. All labs will be graded according to a rubric.
Lab Equipment Handout Become familiar with the common lab equipment on this page. Keep this page on the left side of your yellow lab folder for future reference.
Lab Write-Up Format and Evaluation Rubric All lab write-ups need to follow the correct format. All conclusion questions need to be answered using COMPLETE SENTENCES! Keep these on the left side of your yellow lab folder for future reference.
Your 1 st lab partner will be…… Get together with your 8:00 partner right now.
Lab: “Lab Techniques” Get out some blank paper. We’re going to do your 1 st lab write-up!
Table of Contents Write “Table of Contents” at the top of a blank piece of paper. Make 2 columns: Title of Lab and Lab Number Write the lab name and number of lab. The table of contents page is always the first page on the right-hand side of your lab folder. Title of LabLab Number Lab Techniques1
Lab Write-Up Title-Purpose-Hypothesis-Materials- Procedure-Reflection Statement Since this is your first lab write-up, we’ll do it together as a class… Everything you need to write will be in BLUE
Title This is the easiest section of the whole lab write-up. Simply write the title of the lab at the top of a blank piece of paper. “Lab Techniques”
Purpose What is the purpose of this lab? What are you trying to learn or figure out? This information is typically found in the opening paragraphs of the lab handout. Purpose The purpose of this lab is to learn how to use a bunsen burner, how to handle solids and liquids, how to use a balance, and how to practice basic safety techniques in lab work.
Hypothesis With your lab partner, discuss what you think the outcome of the lab will be. What do you think will happen? Hypothesis After completing this lab, I will know how to work safely in a chemical laboratory.
Materials The materials section is simply a list of the materials that are needed to conduct the lab. Materials -Balance-100 mL grad cylinder -250 mL beaker (2)-Wire gauze -Bunsen burner/striker-NaCl (sodium chloride) -Copper wire-Spatula -Crucible tongs-Test Tube & rack -Evaporating dish-Weighing paper -Water squirt bottle-Test tube holder
Procedure This is the section of the lab write-up that will take up most of your time. You need to list step-by-step instructions on how to conduct the lab. The first step should ALWAYS BE safety equipment. The last step should ALWAYS BE clean up and wash hands. You CAN use pictures or sketches. You CAN simply use bullet points. Summarize – DON’T just re-write everything from the lab handout.
Procedure 1.Safety glasses/apron/hair 2.Location of safety equipment/Table 1 3.Gas valves off? 4.Compare bunsen burner w/picture 5.Partly close air ports, gas on, light burner w/striker. Adjust gas valve/flame 8 cm above barrel. Adjust/flame/steady, quiet, w/light- blue inner cone.
Procedure, continued 6.Crucible tongs/10 cm copper wire in flame (see pic) 2-3 sec/3 different spots. Observations/Table 1 7.Completely close air ports/observe/record color of flame/sound. Crucible tongs/evap. dish tip of flame 3 min. Cool on wire gauze, burner off. When cool, look at dish/record observations/Table 1 8.Balance = zero.
Procedure, continued 9.Mass weigh paper/nearest.01g/Table 2. NaCl on separate piece/transfer 13 g NaCl to paper on balance. Exact mass/Table 2. 10. Transfer NaCl on paper test tube (see pic) 11. Mass 250 mL beaker/Table 3. Water to 50 mL mark, mass/Table 3. Repeat with 100 mL and 150 mL/record mass each time. Mass of water only = mass of water + beaker —mass of empty beaker
Procedure, continued 12. Repeat step 11 w/dry 250 mL beaker. Use grad. cylinder for water. Bottom of meniscus/record nearest 0.1 mL/Table 3. 13. Clean equipment, put back, gas valves off, clean tables, WASH HANDS.
Reflection Statement The reflection statement is written AFTER you complete the lab. In this short paragraph, the following questions need to be addressed: 1.Was your hypothesis correct? 2.What were the primary sources of error in this experiment? 3.How could these sources of errors be minimized in future trials? For now, just write: Reflection Statement
Procedure, continued That’s it! Staple your lab write-up to the front of your lab handout and put it in your lab folder behind the table of contents.
Safety Project Work Time Be sure to use whatever class time we have left wisely… Remember, the safety projects are DUE NEXT CLASS PERIOD! NEXT TIME: Lab next class period – be sure to dress appropriately…NO FLIP-FLOPS! No signed safety agreement = no lab!