The different types of pipettes
How to use a pipette
The precision experiment
The accuracy experiment

Part 2:

SDS-Page Electrophoresis
Agarose Gel Electrophoresis

Data/Results/Calculations: (2 points) In this section you should organize all the observations and data that was collected as part of the experiment, being sure to clearly label each measurement and/or part of the experiment. You may wish to construct a data table for a neat and professional looking report. Please note that screen shots from the lab video of data are not permitted.
Be sure to include data/results/calculations for:
Part 1:

Pipette Precision (Variable Volume vs. Graduated Glass Pipette)

Mass Data
Calculated Volume
Mean
Standard Deviation

Pipette Accuracy (Variable Volume vs. Graduated Glass Pipette)

Set Volume
Measured Volume
Difference

Part 2:

SDS-Page

Data Table
Equation from Plot of Log MW vs. Rf
Calculation of MW of P2
Calculation of MW of P2

Agarose Gel

Which dog is the unknown?

Discussion Questions: (2 points)
How is a glass pipette similar and different from an automatic pipettor?
What is the difference between accuracy and precision?
When pipetting how should you treat volatile organic compounds differently than water-based solutions?
Is electrophoresis an analytical or preparative technique? Explain giving one piece of evidence in your rationale.
Conclusion: (2 points) The conclusion section should be a well developed paragraph (at least 6 sentences), separate from the Data/Results/Calculations section. It should be written in complete sentences (third-person, present or past tense) and should summarize the results of the entire experiment(s). You should emphasize what important concepts were explored, what the results showed, what conclusions can be drawn, and how the purpose of the experiment was accomplished.
Be sure to include:
Which pipette was the more precise?
Which pipette was the more accurate?
Notes: The notes section is where you should put information that does not belong in other sections. This would include background information, or anything else that you deem important that was not directly related to performing the experiment

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your answer in each case:

Structure and Properties of Organic Compounds

2.- Explain if the following compounds are aromatic, antiaromatic or non-aromatic.

Machine Translated by Google

3.- Look for the structures of caffeine, purine and pyrimidine bases. Reason its structure and if it

is about aromatic compounds.

Structure and Properties of Organic Compounds

4.- Discuss the basicity of the following compounds:

Academically Directed Activities-2022-2023

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1. Identify different layering patterns that lead to the cubic unit cells, determine coordination

numbers, and compute packing efficiencies for atomic solids.

2. Determine the empirical formula of an ionic compound from its crystal structure.

Overview Use the visualization tool found at https://atom.calpoly.edu/crystal/ and answer the following

questions. Many of the functions in the simulation are bound to keys; look at Key Controls for the list.

The simulation starts by default with the Simple cubic lattice screen. The drop-down menu allows you

to view other lattice structures. You can rotate the structure and view it from different sides by holding

the mouse and dragging the structure. You can also zoom in and out with the mouse wheel. There are

two important modes that are controlled with the Expansion slider at the bottom of the screen. In

Layering mode, you can see how the 3D crystal lattice can be made by stacking layers of atoms. In Unit

Cell mode, you can see how the 3D lattice is composed of repeating unit cells with fractional atoms.

Lattice Structures of Atomic Solids

Layering We will begin this activity by looking at the layering pattern of particles that gives rise to each of the

cubic unit cells. A unit cell is the smallest unit in a repetitive pattern that makes the 3-dimensional lattice

structure. As shown in Figure 1, there are two basic 2D patterns for layers of atoms. The atoms in each

layer can be packed in a square array, or “close-packed” with a rhombus representing the simplest

repeating pattern. When multiple layers of a particular 2D pattern are stacked together, they can

generate a variety of 3D patterns, depending on how the layers are shifted relative to each other. If the

layers repeat identically as they stack, this can be described as “aa” stacking. If the second layer is

staggered relative to the first layer, but the third layer is stacked directly above the first layer, this

stacking pattern is described as “aba.” You can explore this layering effect by selecting Layering on the

left of the visualization tool and using the Expansion slider.

Figure 1. Square and rhombic unit cells in 2D layers.

For each of the cubic lattices (simple cubic, body-centered cubic, and face-centered cubic), answer the

following ques

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some examples are any medicine, cosmetics, soaps, food, artificial food

flavors, artificial food colors, etc. The rubric for the presentation are:

Some medicines or cosmetics, describe how it is synthesized. Try to

point out the steps that you have learned in your class ( eg this is a

hydroxylation reaction / this is a dehydration reaction / this is a

bromination reaction / etc. etc).

* If you are talking about some products that are isolated from a natural

source, discuss the steps of isolation.

* Discuss briefly, if there is any toxicity / beneficial effect

* If there is toxicity, what is your opinion to improve the product?

You can answer the essays in slide.

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Chem B11

Name_____________________________________

Lab Period_________________________________

1. How many significant figures are in the following numbers?

6.06 g

1000 cars

85%

1.06 qt/L

25.0 mL

1.05 x 105 m

25 tablets

45 miles/hr

0.000059 m

1001 in

10250. mcg

24 hrs/day

105100 lb

30.8 mg

5.6 x 10-7 g

1000 m/km

2. Scientific Notation. Keep the same number of significant figures.

2.74×10-4

4.06×104

100010000

5.01×106

3.2×10-2

0.000700

1.1×10-3

6×10-6

50.0

3. Calculations: do the following math problems giving the answer with the right number of significant figures. Round your answers in the right way according to sig fig rules.

a. 11.1 + 12.06 + 10 =

g. 25.0 x 10.00 =

b. 12500 + 2330 – 1000 + 10.6 =

h. 66/100.9 =

c. 0.0045 + 0.04602 – 0.0000020 =

i. (15.2 x 23)/26.34 =

d. 4 x 10-3 x 3 x 10-2 x 2 x 10-4 =

j. 6.21 x 1040/(4.678 x 10-50)

e. 8 x 102/(2 x 10-7) = k.

f. 9 x 10-4 x 3 x 107/(1.2 x 106) =

4. What do you see? Read the following measurements with the right number of significant figures. (the scale is in mL)

Image result for graduated cylinder meniscus

Reading:_________________

Image result for ruler measurements cm significant figures

Reading:__________________

Image result for milligram scale weighing picture

Reading:____________________

2

Bakersfield College Wade Ellis

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Required Resources
Read/review the following resources for this activity:

Textbook: Chapter 1 and 2
Lesson
Minimum of 1 scholarly source

EBOOK: Bauer, R. C., Birk, J. P., & Marks, P. (2019). Introduction to chemistry. New York, NY:

Initial Post Instructions
The Discussions in this course are set up to deepen your understanding of the material as you make real-world connections and employ creative thinking. To get the most from these discussions, full engagement is expected on the part of the student. Be sure to stop by the discussion section frequently, not only to post but to read the postings of your peers and instructor. Engaging with your peers and learning together is key to this experience. For your initial post, choose one of the options below:
Option 1:
We will begin this topic by practicing the use of the scientific method. The steps of the scientific method are observation, hypothesis, experiment, results, and theory. Using your understanding of the scientific method from your readings and lessons, you will be applying this knowledge to a real-world situation. Take a real-world scenario in the news, or another outside source and apply the scientific method, being sure to detail the controls on your experiment. ¯Describe a result that would confirm your hypothesis.
Option 2:
Choose a scientific paper written in the last year.  The Chamberlain library is a great source for this.  For your chosen paper, look into the study and discuss how the scientific method was used in this paper.  Be sure to note they hypothesis, variables, results, etc.  Based on your understanding of the scientific method, be sure to discuss if you find this paper a trustworthy source and why.CHEM

Writing Requirements

Minimum of 2 sources cited (assigned readings/online lessons and an outside source)
APA format for in-text citations and list of references

Criteria
Initial Post Content: Addresses all aspects of the initial discussion question(s), applying experiences, knowledge, and understanding regarding all weekly concepts.
Evidence & Sources: Integrates evidence to support discussion from assigned readings** OR online lessons, AND at least one outside scholarly source.*** Sources are credited.*
Professional Communication: Presents information using clear and concise language in an organized manner (minimal errors in English grammar, spelling, syntax, and punctuation).

Notes
Credited means stating where the information came from (specific article, text, or lesson). Examples: our text discusses…., The information from our lesson states…, Smith (2010) claimed that…, Mary Manners (personal communication, November 2017)…
**Assigned readings are those listed on the syllabus or assignments page as required reading. This may include text readings, required articles, or required websites.
***Scholarly source – per APA Guidelines, only scholarly sources should be used in assignments. These include peer-reviewed publications, government reports, or sources written by a professional or scholar in the field. Wikipedia, Wikis, .com websites, or blogs should not be used as anyone can add information to these sites. For the discussions, reputable internet sources such as websites by government agencies (.gov) and respected organizations (.org) can be counted as scholarly sources. Outside sources do not include assigned required readings.

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Lab 9: 
http://vlab.amrita.edu/index.php?sub=2&brch=191&sim=692&cnt=1

Lab 8: 
http://vlab.amrita.edu/index.php?sub=2&brch=294&sim=1351&cnt=1

Lab 7:
http://vlab.amrita.edu/index.php?sub=2&brch=191&sim=849&cnt=1

Lab 6:
http://vlab.amrita.edu/index.php?sub=2&brch=191&sim=607&cnt=1

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