PREPARATION OF PREPARATION OF LABORATORY REPORTSLABORATORY REPORTS

TYPED or computer generated.

Lab reports are due at the beginning of the next week’s lab session.

For Group Reports (took part in lab and writing report)- will receive the same grade for that report. – Option of preparing individual lab reports– In either case each individual must keep a copy of

the lab report in their portfolio.

Based on the experimental data gathered, and observations made during your lab experiment.

Based on the experimental data gathered, and observations made during your lab experiment.

If an error is made:, it will be – reflected in the data/observation area – recognized and EXPLAINED.

FORMAL papers Written in the THIRD PERSON.

– "It is surmised", "One would conclude", etc.

LAB REPORT FORMATLAB REPORT FORMAT

Title PageTitle Page

The title of the lab is to be centered on the paper.

In the lower right-hand corner of the paper.– Name's) in alphabetical orderalphabetical order– Date– Period

HypothesisHypothesis

contains your HYPOTHESIS – what the results of the experiment will show– what you will be able to do by the end of the lab.

• EXAMPLE: It is speculated that increasing the concentration of and acid in and aqueous solution will cause the pH to rise.

correctness of the hypothesis is not as important, as your ability to – determine the correct/incorrectness of your hypothesis

after the experiment has been completed, and– explain WHY your hypothesis was correct / incorrect.

. . IntroductionIntroduction

General background information a person reading the lab would need to know in order to understand the rest of the report – Scientific THEORY on topic's) related to

the experiment – Math equations used are written and explained.– Terms are defined

Introduction ExamplesIntroduction Examples

In this experiment varying methods which effect the rate of solution are studied to determine which increases the rate the most.

Density, a measure of the concentration of a material, is determined by dividing the mass of the substance by the space (volume) that it occupies. (D = m/V)

Stoichiometry is the mathematical study of the quantities that enter and are produced by chemical reactions.

.. Materials Materials

Listed in formal reports. Only changes from that given in the

experiment need be noted. “As stated in (Name of Lab)”

– Exceptions:• Dish washing liquid replaces glycerin• Strontium chloride replaces sodium

chloride

.. Procedure Procedure

Paraphrased in formal lab reportsOnly changes from that given in the

experiment need be noted. “As stated in (Name of Lab)”

– Exceptions:• Step 5 omitted in Part 3• Three trials conducted instead of 5

Observations/DiscussionObservations/Discussion

Paragraph formDescribe all that you see, hear, smell

and feel Specific amounts of reactants and

lab procedures are NOT included.

26.58 cm

32.0 sec

Observations/Discussion ExampleObservations/Discussion Example

– Platinum wire was treated with several different compounds, and then exposed to flame. The compounds turned red, green and yellow when the wire entered the fire

– Pretend that you are a radio announcer and must describe the changes that you observe.

– NO NUMBERS, please

DataData

TablesGraphs All tables / figures / graphs are given

TITLES – indicate what the graphic is showing– Remember a graph T.A.L.K.S.

Data ExamplesData Examples

Size-fraction distribution of Naron soil

Analytical Data on Edible Oils in Study (nm)

Calculations/EquationsCalculations/Equations

All math computations – Includes addition and subtraction– Samples of each type

Balanced chemical equations

Due to the extensive use of symbols, this section may be NEATLY printed in BLUEBLUE or BlackBlack ink.

Calculations/Equations ExamplesCalculations/Equations Examples

HCl Produced:

Percent Yield of Aluminum Oxide

ConclusionConclusion

Make a claim regarding your hypothesis.

Provide evidence for our claim. Provide reasoning that links the

evidence to your claim .RelateRelate to life .

Prove Proved Disproved

Conclusion ExampleConclusion Example

(The CLAIM)The abstract “The masses before

and after the chemical reaction will be equal.” was

Conclusion ExampleConclusion Example

(The EVIDENCE)As can be seen in data table 1, the

combined masses of the reactants and the combined masses of the products are reasonably the same. 27.54 g v. 27.32 g.

Conclusion ExampleConclusion Example

(The REASONING) According to the Law of Conservation of Mass According to the Law of Conservation of Mass

no amount of matter can be gained or lost. no amount of matter can be gained or lost. This requires the masses of the reactants and This requires the masses of the reactants and the products to be equal. The slight the products to be equal. The slight discrepancy of the reactant and product discrepancy of the reactant and product masses may be due to inefficient methods of masses may be due to inefficient methods of material transfer within the experiment; material transfer within the experiment; specifically a small amount of solid was specifically a small amount of solid was unable to be retrieved from the beaker during unable to be retrieved from the beaker during the filtration process…the filtration process…

Conclusion ExampleConclusion Example

(Relationships)Relationships) It is the goal of any industrial process to It is the goal of any industrial process to

recover as near to 100% of the product. recover as near to 100% of the product. This is desired for financial as well as This is desired for financial as well as industrial success. Equipment must be industrial success. Equipment must be fitted to contain all of the product w/o fitted to contain all of the product w/o being too large and costly. Methods of being too large and costly. Methods of production and transfer are designed to production and transfer are designed to minimize loss of product which are then minimize loss of product which are then balanced against profit margins. balanced against profit margins.