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.