Lab Technique Activity WORKSHEET S24-1-1 (1)

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Walden University *

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116

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Chemistry

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Apr 3, 2024

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Arizona State University School of Molecular Sciences 1 Week 1 CHM 116 Lab Technique Activity and Lab Writing Name(s): ___________________________________Group #: _____Date: ________ DIRECTIONS: Wear proper PPE at all times! Fill in the appropriate information for each station. Each station should take approximately 5 minutes or less to complete. You will be able to return to the stations if needed to check data or observations. You may write any additional information (i.e. observations, notes, data, etc.) you need to help you answer or complete a station at your lab bench when you are done. 1. TAs will show on monitors. Name the pieces of equipment at this station. A. ___________________ B. __________________ C. ___________________ D. ____________________ E. ___________________ 2. At your station. It is important to be able to correctly read and dispense solution volumes: Part 1: Record the level of water in the three pieces of equipment. Use as many significant figures as is possible for each. A. Buret (initial volume) _______________ B. 10 mL graduated cylinder ________________ C. 100 mL graduated cylinder _________________ Part 2: Each person in the team must transfer exactly 10 mL of water from one beaker to the other, using a 10mL serological pipet and pipet pump. Initial below that each of you completed the task. _________ ________ ________ ________ 3. At RIGHT fume hood. Bring a clean plastic pipet and test tube to this station. Dispense 10 drops of Solution 1 into the test tube and add 1-2 drops of phenolphthalein indicator ( often used as an indicator in acid–base titrations) to the solution. Briefly describe your observations below and classify the solution as acidic or basic by circling the appropriate answer. When finished, dispose of the chemicals in the Waste Container, and wash glassware and return it to proper drawer before continuing to next station. A. Solution 1 Observations: _______________________ Circle Result: Acidic or Basic 4. TAs will show on monitors. Following proper safety protocols is extremely important in lab. Part 1: Describe the proper PPE you must wear in the lab at all times. A. ______________________________________________________________ B. ______________________________________________________________ C. ______________________________________________________________ D. ______________________________________________________________

Arizona State University School of Molecular Sciences 2 Part 2: View the picture of an experiment taking place. Identify two safety violations taking place in the scene. There may be more, but you only need to identify two. A. Violation 1: ____________________________________________________ B. Violation 2: ____________________________________________________ 5. At RIGHT fume hood. There is a 6M stock solution of “Solution 2” provided in pump dispenser bottle. Develop a procedure (include in report) and calculate (include in report) the necessary volumes to dilute the stock solution to make 125 mL of a 0.48M solution. Show your work. A. Volume of Solution 2:_______________ Volume of Water: ________________ B. True or False. If you poured out too much of something from a stock container, it is possible to put extra solid/solution back into the stock container without contaminating it. 6. At your station. Test tubes A and B are labeled at the station. They were combined into test tube C, and a precipitate was formed. DO NOT MIX THE CHEMICALS- only observe what you see. Write the formulas of the solutions in test tube A and B, then identify the formula of the precipitate in test tube C. Back at your lab bench, write balanced molecular, complete ionic, and net ionic equations to describe the reaction that has taken place. Include physical states. A. Test Tube A: _________________ Test Tube B: _________________ B. Precipitate in Test Tube C: ________________ C. Balanced Molecular equation: D. Balanced Complete ionic equation: E. Net ionic equation:

Arizona State University School of Molecular Sciences 3 Lab Report Writing Assignment Outline For 116 Activity 1 Also refer to the lab 1 sample report in CANVAS for additional information on writing scientific lab reports.  Helpful Tips: o Write the lab report together, that way all lab members learn early on how to write each part of the report.  Tip: Each group member can write a section and then assign another person to revise that section so you can all trade. It makes the report flow nicely overall. o Make sure that the lab report flows together, it should not be obvious that each section was written by a different person. o If one group member is weak in their writing skills, help them improve. Directions: Fill out the following lab report sections based on the data provided. Title Page: Create your own title and include the names of all Lab group Members. Also include the name of your TA and the day of the week and time of your lab.

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Arizona State University School of Molecular Sciences 4 Introduction: This section is your opportunity to explain what the goal(s) of the experiment were and to include some background information that supports why the experiment was necessary.  State the problem and goals that you as a scientist wanted to accomplish.  Describe your general approach to solving the problem and include the background theory behind your approach. Include any equations you will be using here and describe the variables. o Note: You should not copy the description from the worksheet activity, and do not include any details from your experiment or any of your final results here. Those go in the next sections as described below.

Arizona State University School of Molecular Sciences 5 Procedure/Experimental: This section should include the materials you used during the investigation for #5 ONLY as well as the procedure you followed. Give enough details such that someone else could read your description and repeat the experiment. This section should be written in third person (no “I”, “We”, etc.), and past tense (i.e., A total of 1.25g (0.0214 mol) NaCl was dissolved in 300 mL distilled water to make a 0.0713 M solution.). Do not report any results here. That will be done in the Results section. o Reminders:  Put a zero in front of decimal places (0.500g rather than .500g)  Use correct significant figures . (addition or subtraction: number with least number of decimal places determines number of decimal places in answer; multiplication or division: number with least number of significant figures determines sig figs in answer). Zeros after decimal place are significant, leading zeros before a non-zero digit are not significant.  Include units with the correct number of significant figures for all numerical values.  Write in complete sentences, which make up complete paragraphs, not bullet points or list format.

Arizona State University School of Molecular Sciences 6 Results: This is where you show how you calculated ALL of your results for #5 ONLY . Use a table or graph to organize and present your results, but do not explain them in detail here. That will be done in the Discussion section. Label all tables or graphs with a brief title/heading to indicate which part of the experiment they came from. Each table or graph should have an explanation of what information was collected, calculated or recorded for the experiment and include proper units . o You should include one sample calculation for each calculation, both descriptive and numerical . You do not have to show every calculation done, just a sample of each one using actual data collected (For example, 3 trials of a similar calculation, only show 1 trial). o Show statistical error calculations when appropriate. o Chemical Equations for example should include: phase symbols, charges, and balanced equations, superscripts and subscripts. Such as: Example: 𝐴𝑙 3+ (𝑎𝑞) + 3𝐶𝑙 − (𝑎𝑞) → 𝐴𝑙𝐶𝑙 3 (𝑎𝑞)  Use Equation Editor when possible to make the report more professional.  Number equations so that they can be referred to elsewhere in the report.

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Arizona State University School of Molecular Sciences 7 Discussion: This is where you explain the results that you obtained. Do not repeat the experimental/procedure here. Discuss what results were obtained and whether or not these were the results that were expected. If not, explain why the results are different. Specifically relate your results to the main concepts of the lab. o Draw a clear line between the main concepts of the lab, your results, and your conclusions. o Explain any issues/errors you encountered ( other than human error ), and what effect this may have had on your results (i.e. why you may not have gotten the desired results.). If you messed up the experiment, explain what happened and what the effect on your results was or might be. o State your statistical error and discuss its importance. o Relate the lab back to the main chemistry components of the lab by reiterating the problems/goals/purpose of the Investigation (Remember: Reiterate ≠ restate). o Cite any outside sources used. Any more than 3 words that are not your own should be cited. Include the full url for internet sources. If you did not know it before writing the lab report it is not common knowledge and needs to be cited! You can cite your lab manual. Examples:  Copper is an element (common knowledge – do not need to cite)  Copper ore is mined and then obtained by acid leaching (not common knowledge – CITE IT) _

Conclusion: This is where you conclude if the goal of the lab was achieved. Make sure to relate it back to the real world application of the lab. o If the lab has a specific real world goal, explain if you achieved it and give your opinion as a scientist on the situation ( Not in 1 st person) o Mention the bigger picture (real world/scientific connection) o End with a concluding statement about the lab. Works Cited:  ACS Style. o Hawkes, S. J. Journal of Chemical Education 2004 , 81 (1), 14. o Cite lab 1 materials as: General Chemistry 116 investigation handout 1. Arizona State University SMS, Summer 2022  Use at least one reputable source and go to the following website to create your citation: http://www.citationmachine.net/items/new Arizona State University 8 School of Molecular Sciences