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CHEM 1001 – 2020, Laboratory #3 1

Name (First & Last): CHEM 1001, Fall 2020, Lab #3 – Sunscreen & UV-B Radiation

LAB ASSIGNMENT WORKSHEET This is what you will upload to Canvas, as a single PDF file, for your TA to grade. Pre-Lab Questions: 1) Is the visible light (that we detect with our eyes) radiation? Explain your answer. 2) What are the 4 types of UV radiation? 3) Which type of UV light is absorbed by ozone, but not by oxygen or nitrogen gases?

Part 1: Your TA will play 2 videos for you, use the information from the videos to complete the data table below:

Data Table 1: In-Class Work

Question: Answer:

Is sunscreen regulated?

Who regulates sunscreen?

Is the SPF rating for UV-A or UV-B protection?

How is sunscreen tested for effectiveness?

CHEM 1001 – 2020, Laboratory #3 2

Your TA will give you active ingredients for one of the sunscreens mentioned in the video, complete the Data Table 2 with that information.

Data Table 2: Sunscreen Ingredients

Question: Answer:

Name of Sunscreen:

Note: Include brand, SPF and application

method

Active Ingredients:

What type (category)of sunscreen is this?

Note: You will not be able to complete this

question yet…..

Part 2: Watch this video from TED-Ed

https://www.youtube.com/watch?v=JX8rv_natkw The next few questions are based on the information from the TED-Ed video:

1) Which penetrates further into the skin, UVA or UVB? 2) What does UVB help our bodies to do? 3) What are the two ways, or methods, that sunscreen can protect your skin?

CHEM 1001 – 2020, Laboratory #3 3

Part 3: View the Infographic in your Laboratory Assignment and use the information in the infographic to start to complete the data tables below:

Data Table #3 – Types of Sunscreen

Type of Sunscreen How Does it Work?

Data Table #4 – Active Ingredients

Active Ingredient Chemical Formula (make sure to use subscripts)

CHEM 1001 – 2020, Laboratory #3 4

Part 4: Next you will investigate the sunscreen that you use! Gather your bottle of sunscreen, it does not matter what brand or SPF you use – it just has to be sunscreen! If you do not have sunscreen, find one online that you would be interested in purchasing (because you will want to have some to keep yourself safe from the sun).

Data Table #5 – My Sunscreen

Brand of Sunscreen

SPF

Link to a location where it can be

purchased online

Active Ingredients

Which Type of Sunscreen is it?

(See Data Table #3)

How were you able to identify what type of

sunscreen it is?

Does it protect against only UVA, only UVB, or is it Broad Spectrum?

CHEM 1001 – 2020, Laboratory #3 5

Part 5: It has been identified that some types of sunscreen have an environmental impact! To answer the next questions, you will need to do some internet research on the environmental impact of sunscreen. 1) Which type of sunscreen is thought to negatively impact the environment? 2) What active ingredients and/or what type of chemicals are found in the sunscreen that is thought to negatively impact the environment? 3) How does these active ingredients impact the environment? 4) What sources did you use to answer this question? (list them below)

CHEM 1001 – 2020, Laboratory #3 6

Part 6: Read the blog below, from Harvard Medical School: https://www.health.harvard.edu/blog/keep-using-sunscreen-while-fda-updates- recommendations-on-safety-of-sunscreen-ingredients-2019073117377 1) Summarize the blog/article below: 2) What does the term “GRASE” stand for? 3) Which two active ingredients are deemed GRASE? Part 6: As a general rule, doubling the SPF value would, hypothetically, decrease the amount of UV light that reaches your skin by 50%. Most healthcare professionals will recommend using an SPF 15 sunscreen and reapplying every 2 hours.

Complete Data Table #6; For each SPF, calculate the % of light that reaches skin

SPF Value

% of light that is blocked by the sunscreen % of light that reaches skin

2 50 50

4 75

8 88

15 93

30 97

60 98.5

CHEM 1001 – 2020, Laboratory #3 7

Part 6 (continued): 1) Using the information in Data Table #6, explain why most healthcare professionals will recommend to use an SPF 15 sunscreen instead of one with a higher SPF?

2) Plot the data from Data Table #6 in Excel and turn in the graph with your worksheet (either as the last page of this worksheet or as a separate page). 3) Does your plot follow a linear or an exponential curve? 4) Does the curve support or reject the advice from most medical professionals? Explain your answer.

  1. AnswerIs sunscreen regulated:
  2. AnswerWho regulates sunscreen:
  3. AnswerIs the SPF rating for UVA or UVB protection:
  4. AnswerHow is sunscreen tested for effectiveness:
  5. AnswerName of Sunscreen Note Include brand SPF and application method: Up&Up spray, SPF 30
  6. AnswerActive Ingredients: Avobenzone (3.0%) Homosalate (10.0%) Octisalate (5.0%) Octocrylene (2.0%) Oxybenzone (4.0%)
  7. AnswerWhat type categoryof sunscreen is this Note You w i l l not be able to complete this question yet:
  8. Type of SunscreenRow1:
  9. How Does it WorkRow1:
  10. Type of SunscreenRow2:
  11. How Does it WorkRow2:
  12. Active IngredientRow1:
  13. Chemical Formula make sure to use subscriptsRow1:
  14. Active IngredientRow2:
  15. Chemical Formula make sure to use subscriptsRow2:
  16. Active IngredientRow3:
  17. Chemical Formula make sure to use subscriptsRow3:
  18. Active IngredientRow4:
  19. Chemical Formula make sure to use subscriptsRow4:
  20. Active IngredientRow5:
  21. Chemical Formula make sure to use subscriptsRow5:
  22. Active IngredientRow6:
  23. Chemical Formula make sure to use subscriptsRow6:
  24. Active IngredientRow7:
  25. Chemical Formula make sure to use subscriptsRow7:
  26. Active IngredientRow8:
  27. Chemical Formula make sure to use subscriptsRow8:
  28. Brand of Sunscreen:
  29. SPF:
  30. Link to a location where it can be purchased online:
  31. Active Ingredients:
  32. Which Type of Sunscreen is it See Data Table 3:
  33. How were you able to identify what type of sunscreen it is:
  34. Does it protect against only UVA only UVB or is it Broad Spectrum:
  35. 5075:
  36. 5088:
  37. 5093:
  38. 5097:
  39. 50985:
  40. Text1: Wenjia Zhang
  41. Text2:
  42. Text3: UV-A, UV-B, UV-C, UV-V
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