an ​assignment​ for a lab report in chimestry

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Lab Make-Up Assignment – Chemical Reactions CHEM 131L Include the following information at the top of the first page of your assignment: Name: Lab Section Number: Experiment Title: Due Date: GENERAL INSTRUCTIONS The entire report must be typed. Please provide all of the information as outlined below. For any chemical equation that is written, states must be included for all reactants and products. Section 1 1. Copy and complete the table from page 25 of the Lab Manual as instructed for the Prelab Assignment. Section 2 2. For the reactions that were to be completed in Part A of the experiment, prepare a table with the formulas from Group A as headings of the columns and the formulas of Group B as headings of the rows. Within the table, fill in the formula and systematic name of the predicted precipitates that will form. If no precipitate is expected from the reaction, write ‘No Reaction’. For each predicted precipitate, look up the compound online, and write the expected color. Cite the source of the color information for each compound. 3. Write the molecular, complete and net ionic equations for the following reactions: a. AgNO3 + Na2CrO4 b. Cr(NO3)3 + Na3PO4 c. Pb(NO3)2 + NaI d. Pb(NO3)2 + Na3PO4 e. Pb(NO3)2 + Na2CrO4 Lab Make-Up Assignment – Chemical Reactions CHEM 131L Section 3 4. Three of the seven tested reactions from Part B were acid/base reactions. For each acid/base reaction include the following: a. Molecular equation b. Complete ionic equation c. Net ionic equation d. For each reactant, indicate whether it was a strong acid, strong base weak acid or weak base. 5. Three of the seven tested reactions from part B were oxidation/ reduction reactions. (HINT: only one of reactions 5 or 6 will react. For the other there will not be a reaction.) For each oxidation/ reduction reaction include the following: e. Molecular equation f. Below each molecular equation, state which element was oxidized and indicate the oxidation number the element had as a reactant and product. Example: Zn(s) + 2HBr(aq)  ZnBr2(aq) + H2(g) Zinc was oxidized. The oxidation number changed from 0 (reactant) to +2 (product). Section 4 Type the answer to each question below, using complete sentences. 1. What were the three types of reactions 2. What are three observations you could make that would indicate a chemical reaction has occurred? 3. Is the statement ‘no reaction occurred’ an example of an observation or a conclusion? Briefly explain your answer. ...
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madushan
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