chemistry lab report, HELP ?

CHM 1210L General Chemistry Laboratory I 1 Revised 10/31 /14

Oxidation- Reduction (#31) Supplemental Grading Rubric

• Refer to the main guidelines on Pilot – those are the ones we’ll be grading from. This supplement is to provide some additional help specific to this experiment.

• Resources/references. In order to explain the background oxidation-reduction half reactions and the standard reduction series, you’ll want to use some good resources. Cite and reference them correctly. o The lab manual and recitation slides. Gilbert et. al. textbook Chapter 17.1-17.3. o The CHM 1210 Library class guide.

http://guides.libraries.wright.edu/content.php?pid=496590&sid=4240021 o If you use other sources make sure they are reliable, well cited in the text wherever

used and referenced. Make sure they are not from another version of a student report on this topic from here or elsewhere.

o Do NOT work on the report with others. o Do NOT show or share your report with other students. o Do NOT copy the manual or handout.

Writing should be grammatically correct for full credit. • See grading rubric on Pilot for more details on method of grading. Most categories are:

o Missing = 0, Inadequate = 1, needs improvement =2, Complete and well written = 3. Total points vary but are then scaled to maximum of 25.

o Some less important categories: Missing = 0, Inadequate = 0.5, needs improvement 0.75, Complete and well written = 1

Must be in student’s OWN words!!

Title, name, partner, GTA name and section. • Descriptive title that refers to the main point(s) in the report and is not the one from the

manual.

Purpose or purposes: (see description in Lab Report Guidelines) • Places to look for the purpose(s):

o This can be a listing of several points, goals, and or claims. They should include both general and detailed purposes.

• Was the goal the answer to a scientific question, identification of a compound, or develop a technique?

1 Tentative draft. Students will be informed of changes. See also grading work sheet. Lary Sanders 11/3/14

o What will the final claim (conclusion) be? If you know that, it can clarify what the purpose was or should have been. (Normally you would start with the purpose and proceed toward the claim at the end.

• Use these statements to write the rest of the report

Introduction - - - • What is going to be determined through this experiment? • Quickly explain the methods (NOT entire procedures) used to make this determination. • In-text citation of reference(s) used to develop theory. Theory - - - to be explained within the introduction • Explain the theory behind the process.

o How are oxidation reactions different from other reactions? o What is the logic that allows us to determine which reduction half reactions are

stronger?. o Why are we interested in half reactions and their relative magnitudes? You

might research the relationship to batteries as one option. • How will data from the lab be used to answer the question stated in the purpose? • Because this experiment covers a number of reactions they would be listed in the

results rather than the introduction. Experimental Methods -

• In-text citation and end of report reference to the manual for the detailed procedures (see Lab Guideline outline for exact reference. See ACS style guide for other reference citation methods).

• Variations in actual procedure from the manual, for example, halogens done by observing movie.

• Brief, clear description of the procedure so the reader need not have the manual to understand the data and discussion. What did you actually do?

o Written in paragraph form in the proper grammatical style. Third person. Not a list of steps.

Data & Results - - -

• This section starts with a narration of the results referring to the tables. The tables (grid form like in recitation) should have a table for Part 1 metals Cu, Zn, Pb, Cu2+, Zn2+, Pb2+, Ag+, and H+ (Ag(s) is not done) and a separate table for Part 2 halogens showing what reacts and what does not including the observations. In the text include the reactions of KMnO4 with Cl— . In addition, note and cite the information at the top of page 205 that allows you to place the halogens, Ag+, and Cu2+ in relative order (Fe3+/Fe2+ is not done).

• Complete a list (or table) of all reactions including complete balanced reactions with reactants and products for any reaction occurred or that your TA informed you should have occurred. (Similar to data work sheet listing) Be careful to not any reactions you did not observe directly.

• In narrative form (text) explain how you listed your half reactions as reductions in order of strongest reducer to weakest reducer to produce the table of reduction potential series. This includes the logic you used to place the half reactions in order.

• Table including the completed reduction potential series. • Students that did not attend lab must give credit for source of any data they did not collect

themselves (for example due to absence).

Discussion • The goal of the discussion is to evaluate the results and carry the reader from the results to

the claim of the paper and hopefully convincing them of the validity of your claim. (claim = conclusion).

• Evaluate the results: Are there reactions you are unsure of? Are there areas of the series where there might be questions of what is above what?

• Compare the series to the literature listing. (Additional evidence) • What might this series be used for? • Discuss how the experimental design or execution could be improved • Is the hypothesis supported or not. What would be a revised hypothesis if necessary?

References should be present, Must have two or more references. Be aware that this section and in-text citations may be graded more severely with this JAR.

• NOT Wikipedia and NOT a lab report from WSU or Elsewhere. • List more than one reference • List references in MLA, APA or ACS format. • Provide a valid citation for the reduction potential list. • Use in-text citations.