Ch. 14 Notes

5. Generate a dosage calculation problem dealing with this medicine. Also show the work/correct answer to it. You may either make up a dosage or use a realistic one for the medicine (in grams per milliliter).

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Ch. 14 Quiz - includes (but is not limited to) Significant Figures, Lesson 74, Metric Conversions, and Medically Relevant Calculations

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L75

Counting By Weighing, Percent Error Activity #1 (20 pts total)

*Group submissions are permitted, but do not use personal pronouns.

*You are not required to stand/wear goggles.

*If you are using a balance to measure an edible sample, realize that toxic chemicals are measured on them regularly. Wiping the weighing tray down and/or using a barrier is recommended.

The following data needs to be placed into a data table OR a setup where you are showing all work. Include information for both of your samples. (10 pts)

Procedure

Counting By Weighing

1. Approximate the total mass of the “pile” (find a way to ignore the container weight).

2. Approximate the mass of one item.

3. Use CBW to approximate the number of items in the group.

Percent Error

4. Determine the actual number of items in the pile.

5. Calculate your percent error from #3.

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6. Repeat steps 1-5 for your second sample.

Follow-Up Questions (10 pts)

*Answer in complete sentences.

1. Briefly describe your method(s) of determining the masses of the piles. (1 pt)

2. Analyze your percent errors in the following sections.

a. Were each of your percent errors positive or negative? What does these indicate about each of your measured values? (4 pts)

b. Were each of your percent errors small, medium, or large? What does this indicate about the accuracy of each of your measurements? (4 pts)

3. As percent error moves further away from zero, the accuracy of a measurement ___________________________. (recopy this statement with your answer; 1 pt)

Counting by Weighing Activity #2

*You do not need to recopy questions.

*Number your answers and use complete sentences when responding.

*Do not use personal pronouns in any responses.

15 min

1)Determine an approximate mass of the item(s) shown (go to 2 decimal places, in grams). No sentences are needed for this response. (1 pt)

2)Briefly describe your method of mass approximation. (2 pts)

3)Compare and contrast this to counting by weighing (at least 1 similarity and 1 difference). (2 pts)

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Remainder of Class

4)Calculate the percent error of your approximation. No sentences are needed for this response. (2 pts)

5)Provide 1 way to improve your approximation (under the exact same conditions). (3 pts)

GOOD GMA Conversions Interactive (with animations)

In-Class Activity - Make a copy of this document.

L76-78

How big is a mole? (video, 4:32)

https://www.youtube.com/watch?v=TEl4jeETVmg

GMA Conversions Calculator

http://www.rsimons.org/ahs/moles

*This calculator only works for monatomic elements. This will NOT work for diatomic elements (hydrogen, bromine, oxygen, fluorine, iodine, nitrogen, and chlorine).

The following 3 assignments are due by the end of class on the day they are assigned.

Assignment #1 (https://www.visionlearning.com/en/library/Chemistry/1/The-Mole-and-Atomic-Mass/53/reading)

1. Go over the "Reading" section (read and answer comprehension checkpoints).

2. Scroll back to the top of the page and click on the "Quiz" section. Call the instructor over once complete.

Passing Score = 8/10

Gradebook Reporting:

*Passing Score = 5/5 (grade)

*No Passing Score/Attempt Made = 2.5/5 (grade)

*No Passing Score/No Attempt Made = 0/5 (grade)

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Assignment #2 (https://www.ck12.org/assessment/ui/?test/view/practice/chemistry/Conversions-Between-Moles-and-Atoms-Practice&ep=https://www.ck12.org/chemistry/conversions-between-moles-and-atoms/?referrer=concept_details)

1. You may need to sign in with Google in order to complete this assignment. Call the instructor over once complete.

Passing Score = 8/10

Gradebook Reporting:

*Passing Score = 5/5 (grade)

*No Passing Score/Attempt Made = 2.5/5 (grade)

*No Passing Score/No Attempt Made = 0/5 (grade)

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Assignment #3 (https://www.proprofs.com/quiz-school/quizshow.php?title=calculating-molar-mass&q=1)

1. Masses may be off by a couple decimal places (due to the website using a different periodic table from yours). If this is the case, choose the answer that is closest in proximity to the mass that you have calculated. Call the instructor over once complete.

*If you need a tutorial on how to find the formula mass of a compound, watch the following video as needed (you must use headphones - do not play the video through the speakers): https://www.youtube.com/watch?v=Qflq48Foh2w.

Passing Score = 4/5

Gradebook Reporting:

*Passing Score = 5/5 (grade)

*No Passing Score/Attempt Made = 2.5/5 (grade)

*No Passing Score/No Attempt Made = 0/5 (grade)

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Ch. 14 Exam - includes (but is not limited to) Significant Figures, Lesson 74, Metric Conversions, Medically Relevant Calculations, and Lessons 75-78

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