Lab Report Tutorial

Todays Agenda11/13/15Revisit Chemical Reaction Lab

Part 1- Lab ReportIntroductionMaterials and Methods--------------------------------HomeworkComplete the rough draft of your lab report: Materials/Methods Section

Check out the Moon AND Saturn!!1Mrs. UsherScience Lab Report Tutorial

Parts of a Lab Report and Point StructureIntroduction 5 pointsMaterials and Methods 10 pointsResults 25 pointsDiscussion 50 pointsConclusion 5 points

Format 5 points_________________________________________Total 100 points

Rough DraftIn your SINKIntroduction 5 pointsOne paragraph1st sentence: purpose of the lab2nd sentence: hypothesis (what you predicted would happen in the lab and why; if__ then__ because__ format)

Body of the paragraph Background information:Explain the concepts of the lab that someone would need to know in order to understand your lab

Introduction 5 pointsBackground information for BSV lab:What was the reaction equation in symbols and words?What are the reactants? What are the products?What is a chemical change? How can you tell a change occurs? (Work in endo- and exo-thermic here)What is a closed system? What is an open system? Why is it important to know for this lab?What is the Law of Conservation of Matter? Why is it important to this lab?Materials and Methods Section 10 pts2 paragraphs (minimum)Paragraph 1 Materials:Identify materials usedDescribe lab setup/apparatusIdentify important safety precautionsParagraph 2+ Methods:Step-by-step detailed procedure

Materials and Methods Section 10 ptsLanguage is very important!Procedure in your lab packet is written in COMMAND FORMChange the language to:PAST TENSE (because it already happened)PASSIVE VOICE (objective tone)

Materials and Methods Section 10 ptsEXAMPLE:

From your procedure in your lab packet:Measure the bag apparatus using the triple beam balance.

In your lab report:The bag apparatus was measured using the triple beam balance.Todays Agenda11/16/15Create a Google Doc & Share it with your Lab Partner

Introduction, Materials & Methods Sections--------------------------------HomeworkNo Homework

Check out the Waxing Crescent Moon Tonight9Todays Agenda11/17/15Revisit Chemical Reaction Lab

Part 2- Lab ReportResultsDiscussion--------------------------------HomeworkComplete the rough draft of your lab report: Discussion Section

Check out the Waxing Crescent Moon Tonight

10Mrs. UsherScience Lab Report Tutorial

Parts of a Lab Report and Point StructureIntroduction 5 pointsMaterials and Methods 10 pointsResults 25 pointsDiscussion 50 pointsConclusion 5 points

Format 5 points_________________________________________Total 100 points

Rough DraftIn your SINK

Results Section 25 pointsIncludes two parts:Data table (s) quantitative observations (record measurements accurately!)Observations A detailed paragraph (if there are observations to report)DO NOT EXPLAIN in the results section. EVER. Just state what happened, NOT why.MeasurementsMass of Beaker31 gTotal Mass of Cup & Baking Soda41 gMass of Baking Soda10 gVolume of Vinegar50 mLMass of Apparatus BEFORE Chemical Change72.4 gReaction Time32 secMass of Apparatus AFTER Chemical Change72.4 gDiscussion Section 50 points2 Paragraphs1st Paragraph Analysis of Results:Sentence 1 = Hypothesis (focuses your paragraph)Sentence 2 = The hypothesis was/was not supported.Body of the Paragraph = EvidenceFor each claim in the if and then parts of your hypothesis, identify and explain at least one piece of evidence to support it or show that it did not happen in the lab.The number of pieces of evidence depends on the lab.Hypothesize: You will measure the mass of the bag apparatus BEFORE the reaction and AFTER the reaction. Will the mass of the bag apparatus increase, decrease, or stay the same as the reaction occurs? Why?If a chemical change between vinegar and baking soda is observed, then the mass of the bag apparatus will _______________ because _________________________..........How to use your hypothesis to identify what to analyze with evidence:If a chemical change between baking soda and vinegar is observed then the mass will ..because the Law of Conservation of Mass states that the mass of the reactants and products should be equal.How to use your hypothesis to identify what to analyze with evidence:For each part underlined, identify at least one piece of evidence to show that the claim happened or did not happen. How to use your hypothesis to identify what to analyze with evidence:baking soda and vinegar react: Evidence comes from your observationsWhich observations?

baking soda and vinegar react:

Bag felt cold endothermic reaction (absorbed heat)Fizzing sound production of a gas (CO2)Bag expanded production of a gas (CO2)Odor changed vinegar smell went away and was replaced by a milder smellHow to use your hypothesis to identify what to analyze with evidence:mass will stay the sameEvidence comes from data

closed system:Evidence may come from observations or data

How to use your hypothesis to identify what to analyze with evidence:mass will stay the sameEvidence comes from data

closed system:Evidence may come from observations or data

You may write about these together or separatelyMass stayed the same:

LOOK AT YOUR DATA!! Compare mass of bag apparatus before the reaction and after the reactionDid the mass stay the same or change? Why?

closed system:

Did your bag pop?Did it stay sealed?Did it inflate and then deflate?Did you puncture the bag with the paperclips?Did the mass stay the same or did it change?

ALL OF THESE CAN BE EVIDENCE FOR WHETHER THE SYSTEM STAYED CLOSED OR OPEN. NOT ALL WILL PERTAIN TO YOUR LAB.Discussion Continued2nd Paragraph Sources of ErrorIdentify any place where error was introduced into the labErrors include a failure in the apparatus or material(s) or human error in execution of lab proceduresError should NOT be The measurements should have been done more carefully. This tells the reader that you didnt care enough about the lab to be careful. If you made a mistake, include the SPECIFIC mistake you made.Discussion ContinuedFor each error, explain:How the error affected the resultsWhat could be done to eliminate the error next time

Conclusion 5 pointsOne paragraph:Sentence 1: Restate hypothesisSentence 2: State whether or not the hypothesis was supportedSentence 3-5: Briefly summarize the evidence for sentence 2Identify a way the lab could be improved OR an idea for future researchChemical Change Lab

Chemical ReactionHC2H3O2 + NaHCO3 NaC2H3O2 + H2O + CO2acetic acid sodium hydrogen sodium acetate water carbon (vinegar) carbonate dioxide (baking soda)

reactantsproducts

To measure the baking soda, you must first measure the mass of a cup. What is the purpose of the cup?The purpose of the cup is just to serve as a container to hold the baking soda.What are the units for each of the following measurements in this lab?mass: __________

volume: _____________time: ___________

Grams (g)Milliliters (mL)Seconds (s)

Hypothesize: You will measure the mass of the bag apparatus BEFORE the reaction and AFTER the reaction. Will the mass of the bag apparatus increase, decrease, or stay the same as the reaction occurs? Why?If a chemical change between vinegar and baking soda is observed, then the mass of the bag apparatus will _______________ because _________________________..........MeasurementsMass of Beaker31 gTotal Mass of Cup & Baking Soda41 gMass of Baking Soda10 gVolume of Vinegar50 mLMass of Apparatus BEFORE Chemical Change72.4 gReaction Time32 secMass of Apparatus AFTER Chemical Change72.4 gObservationsThe mass of the bag should have stayed the same.Note: It does NOT matter if yours does not as long as you explained possible reasons in the next question.Did the mass of your bag apparatus increase, decrease, or stay the same during the reaction?The mass of the reactants should have EQUALLED the mass of the products. Conservation of MassWhat was supposed to happen to the mass during the reaction? Why?If there was NO change, the system was a closed system, if there was a change, it was most likely because there was an opening in the bag which meant it was not a closed system. How do you explain the change (or lack of change) in the mass of the apparatus during the chemical reaction?During the chemical reaction, the temperature of the bag decreased.During the reaction, you should have observed a temperature change in the bag. How did the temperature of the bag change? The chemical reaction was an endothermic reaction because the temperature decreased.Was this reaction endothermic or exothermic? Explain your answer.