01b - Chem 14BL-2 Lecture 1 Handout PDF

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Summary

Lecture Notes and Slides with practice problems...

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9/23/21

Welcome to Chemistry 14BL! Instructor:

Dr. Jennifer Casey

Office:

Young Hall 3077E

Office Hours: Monday 2:00-3:00pm (YH 1370) Thursday 4:00-5:00pm (YH 1370) Email:

[email protected]

Website:

http://ccle.ucla.edu http://campuswire.com Young Hall 1077; Young Hall 1089; Young Hall 1370

Lab Rooms:

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Enrollment FAQs 1. Do we have lab this week? Yes, lab begins on Friday, Sept. 24th 2. What do I do if I am on a waiting list? Please go to the section you are waitlisted for. You will be enrolled if there is space. 3. I have a time conflict with my current lab section. How do I permanently change lab sections? Find someone else enrolled in the course who is willing to exchange lab sections with you. You can look for someone through our class discussion forum, Campuswire, which can be accessed through CCLE.

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Materials required for Chem 14BL Lab Manual: Chemistry Experiments for Life Science Majors by Russell and Pang (5th edition ONLY) – Can be purchased at the ASUCLA Bookstore Lab Notebook (50 or 100 pages): Bound notebook with duplicate carbon pages – Can be purchased at AXE Office in YH 1275 PPE (Personal Protective Equipment): Safety goggles with side shields and full length, flame-resistant (blue) lab coat – Can be purchased at AXE Office in YH 1275

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Personal Protective Equipment (PPE) PPE will be required starting on Friday, October 1st

Gloves will be provided in lab

Failure to meet the safety requirements will result in dismissal from the lab without make-up time. Repeat violations in safety policy will result in an “F” in the course. 4

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Requirements for a passing grade (C-) In order to obtain a passing grade (i.e. C-) in the class, you MUST: • Complete ALL of the experiments including ALL the reports and writing assignments. • Obtain a MINIMUM of 50% of the total points in EACH of the grading categories on the syllabus. • Obtain a MINIMUM of 50% on the midterm and final exam. The 50% exam rule is a uniform policy in 14BL, 14CL, 30AL, 30BL, and 30CL. Chem 14BL is an impacted course – the last day to drop is October, 8th 5

Crafting strong arguments is a critical skill A scientific argument is when an opinion is based upon and supported by scientific evidence and reasoning. The three components of a scientific argument include: • Claim – a statement answering the original question • Evidence – trends, measurements, and/or observations that support a claim • Reasoning – the connection between the evidence and claim 6

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Aspects that make a “good” claim A good claim should: • Answer the question being asked • Stand alone by rephrasing the question in a complete sentence • Explain a cause and effect The following claims are responses to the question “Does a chemical reaction occur when baking soda and vinegar are mixed together?”. Which claim is considered the strongest? a. A chemical reaction does occur. b. It seems like a chemical reaction occurs since a gas is produced. c. Baking soda and vinegar are both used when baking red velvet cake.

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Aspects that make “good” evidence Good evidence should: • Correctly employ scientific concepts • Include trends or patterns • Consist of multiple trials/observations

Avg. Balloon Diameter Observations

Before Mixing

After Mixing

4 cm

19 cm

Balloon expanded, gas produced

In order to investigate the previous question, data was collected (see table above). Which evidence is considered the strongest? a. The data in the table indicates a reaction took place. b. The baking soda and vinegar reacted with each other and there was a change in diameter of the balloon. c. When the baking soda and vinegar were mixed together, there was an average increase of 15cm in the balloon’s diameter. 8

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Aspects that make “good” reasoning Good reasoning should: • Use appropriate scientific terminology • Thoroughly explain the concepts being employed • Show how the claim and evidence are connected Building off the previous evidence, which reasoning is considered the strongest? a. A chemical reaction occurred because the baking soda and vinegar reacted to produce a change in diameter of the balloon. b. A reaction is characterized by something new being produced. When mixing baking soda and vinegar, the balloon expanded due to the formation of a gas. 9

Another example of forming an argument Experimental Question: Does temperature affect the density of water?

Things to ask yourself during the demo... • What are my observations? • What claims can I make?

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Another example of forming an argument Evidence (what we observed):

Claim (our answer to the question):

Reasoning (putting it together):

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Upcoming lab schedule Date Week 0/1 (9/24 – 9/29) Week 1/2 (10/1 – 10/9)

Experiment • Safety • Lab Check-in • Graphing Exercise • Experiment 1 – Volumetric Pipets (pgs. V.1 – V.4)

Due Nothing • Pre-Lab Experiment #1

Make sure to have proper PPE (blue lab coat, goggles, long pants, closed-toe shoes), lab notebook, and lab manual starting Friday, October 1st! 12

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