#207

Melissa and Jam explore why gasoline doesn't freeze in extremely low temperatures while water and other substances do. They delve into the concepts of intermolecular forces, polarity, and how impurities can affect the freezing and melting points of substances. The discussion includes a comparison of the behavior of different substances at varying temperatures, and a light-hearted conversation on favorite liquids that can exist in both liquid and solid states. They also hint at upcoming merchandise related to the topic.

00:00 Introduction and Setting the Scene
00:43 Why Gasoline Doesn't Freeze
03:10 Chemistry Behind Freezing and Melting
06:43 Intermolecular Forces Explained
15:44 Practical Implications and Fun Facts
20:46 Listener Questions and Closing Remarks

References from this episode:

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

#011 Rebroadcast

Why is honey sticky but salt isn’t? What’s the difference between things that stick and things that just feel sticky? In this episode, Melissa and Jam dive into the chemistry behind adhesion, cohesion, and the forces that make substances cling to surfaces (and to our fingers). They explore intermolecular forces, viscosity, and why some things are nearly impossible to separate once they’re bonded. Plus, Jam shares a hilarious mix-up of words, and Melissa breaks down why this topic turned out to be trickier than expected!

Topics Covered:

• The difference between adhesion and cohesion

• Intermolecular forces: the unseen power behind stickiness

• Why some things feel sticky while others are just stuck

• How temperature and viscosity affect our experience of stickiness

• Why hydrogen bonding plays a key role in making substances cling

• Listener-submitted answers on the “scientific word for sticky”

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

#206

Melissa and Jam address a listener's question about the FDA's reliability in approving products. They discuss the intersection of chemistry, government, and society, focusing on FDA's role in regulating food and drugs. The episode includes a deep dive into the historical thalidomide tragedy, the improvements in the FDA's approval process since then, and the nuances of trusting FDA-approved products. Through personal insights, they emphasize the complexities and challenges faced by the FDA in ensuring public safety.

00:00 Introduction: What is the FDA Up To?
00:18 Listener's Question: Trusting FDA Approvals
01:11 Deep Dive: FDA's Role and Responsibilities
03:35 Case Study: Cold Medicine and Phenylephrine
04:18 Thalidomide: A Historical Lesson
10:11 The Role of Frances Kelsey
13:44 FDA's Evolution and Current Challenges
23:22 Conclusion and Final Thoughts

References from this episode:

1. https://www.uchicagomedicine.org/forefront/biological-sciences-articles/courageous-physician-scientist-saved-the-us-from-a-birth-defects-catastrophe
2. https://www.gao.gov/assets/hrd-82-3.pdf
3. https://www.fda.gov/food/hfp-constituent-updates/fda-revoke-authorization-use-red-no-3-food-and-ingested-drugs
4. https://cen.acs.org/food/food-ingredients/Editorial-Fewer-risky-food-colors/102/i26

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

Ask a Chemist #64

Melissa and Jam delve into intriguing chemistry questions posed by their listeners. They explore whether all salts are salty, the chemistry of gunshot residue and fingerprinting, and the reactions between chemicals and sound waves. Special guest Maison, Melissa's husband, joins to discuss sourdough starter cultures and answer sourdough-related queries. The episode concludes with insightful comments from their Chemmunity members and reassurances about their well-being amid late-night recordings.

00:00 Introduction and Episode Overview
01:45 First Listener Question: Gunshot Residue and Fingerprinting
02:46 Is All Salt Salty?
15:28 Chemistry and Sound Waves
18:28 Sourdough Questions Begin
21:32 Sourdough Myths: Stainless Steel Debate
23:36 Acidity and Metal Reactions
27:47 Sourdough and Gluten-Free Misconceptions
29:40 Starting a Sourdough Business
31:22 Sourdough Starter Names and Maintenance
33:39 Maison's Sourdough Journey
42:06 Late Night Recording Concerns
44:41 Community Shoutouts and Closing Remarks

References from this episode:

1. https://pubs-acs-org.libproxy.library.unt.edu/doi/full/10.1021/acs.joc.1c00805
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC7919833/

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

#205

Jam and Melissa discuss the complexities and consequences of recent executive orders surrounding science funding. Melissa provides insight into how these changes impact university research, faculty positions, and broader society. The duo also highlights the historical context and importance of DEI in academia, emphasizing the broader implications of funding uncertainties on current and future science initiatives.

00:00 Introduction and Special Occasions
00:20 Current Issues in Science Funding
01:10 Host Background and Experience
02:19 Impact of Executive Orders on Science
04:21 Broader Impacts and DEI in Grants
14:03 Indirect Costs and University Funding
16:44 Trickle-Down Effects on Academia
27:03 Importance of DEI Initiatives
40:16 Conclusion and Further Reading

References from this episode:

1. https://www.nature.com/articles/d41586-025-00365-z
2. https://uscode.house.gov/view.xhtml?req=(title:42%20section:1862p-14%20edition:prelim)
3. https://cen.acs.org/education/Racial-ethnic-diversity-US-chemistry/98/i43

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

#047 Rebroadcast

This week, Melissa and Jam explore the chemistry of rust. What even is it? Where does it come from? Is it bad? Is it reversible? Let's get into it.

References from this episode

1. Turning Back Time: Watching Rust Transform into Iron - National Institute of Standards and Technology
2. The Color of Soil - United States Department of Agriculture
3. Why does metal rust? - American Chemical Society
4. Ultra-Pure Water - National Geographic

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

#114 Rebroadcast

Tums, alka seltzer, and other antacids: they're simple, they've been around for a long time, but they're a tried and true method for helping our stomachs. But how do they work? What's the chemistry behind these unsung heroes?

References from this episode

1. Chemistry Julia Burdge
2. Biochemistry 4th edition by Garret & Grisham
3. https://www.scientificamerican.com/article/bring-science-home-carbonation-time/
4. http://websites.umich.edu/~chemstu/content_weeks/F_06_Week10/p848.pdf
5. https://www.acs.org/content/acs/en/education/outreach/celebrating-chemistry-editions/2021-ncw/fizz-race.html
6. https://youtu.be/7VJ4cRWCpDw?t=1s

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife

#204

In this episode Melissa and Jam delve into the fascinating biochemistry behind sourdough bread. They explore the role of microorganisms, including different strains of yeast and bacteria, in the fermentation process. The discussion covers how these organisms contribute to the unique flavors and textures of sourdough, and addresses common questions from listeners about its health benefits, the impact of tap water, and the variability of sourdough starters. The episode combines scientific insights with personal anecdotes about sourdough baking, shedding light on why this bread is so special and why it has gained popularity.

00:00 Introduction to Sourdough Curiosities
00:50 Meet the Hosts and Episode Inspiration
01:16 Listener Questions and Sourdough Popularity
02:48 The Science Behind Sourdough
03:18 Microorganisms in Bread Making
03:43 The Role of Yeast and Fermentation
07:33 Sourdough Starters and Fermentation Process
13:02 The Symbiotic Relationship in Sourdough
16:00 Recap and Listener Questions
20:18 The Art and Chemistry of Sourdough
22:02 Challenges and Rewards of Sourdough Baking
24:46 Sourdough Microbiome and Health Benefits
31:24 Impact of Water on Sourdough
32:55 Sourdough Preservation and Final Thoughts
36:39 Community Engagement and Support

References from this episode:

1. https://www.acs.org/pressroom/reactions/library/the-ultimate-donut-battle-cake-vs-yeast.html
2. https://www.scientificamerican.com/article/single-celled-science-yeasty-beasties/
3. https://www.ncbi.nlm.nih.gov/books/NBK8125/
4. https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/acute-impact-of-ingestion-of-breads-of-varying-composition-on-blood-glucose-insulin-and-incretins-following-first-and-second-meals/A4C860D917A29E4C784B4B2E16C8D0CB
5. https://pmc.ncbi.nlm.nih.gov/articles/PMC3317179/#B18https://journals.asm.org/doi/10.1128/aem.68.2.623-633.2002
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC3317179/
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC10103004/
8. https://www-sciencedirect-com.libproxy.library.unt.edu/science/article/pii/S2161831322013023
9. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2023.1230043/full?trk=public_post_comment-text
10. https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2022.989421/full
11. https://pmc.ncbi.nlm.nih.gov/articles/PMC6345887/
12. https://journals.asm.org/doi/full/10.1128/spectrum.01121-23
13. https://www.mcgill.ca/oss/article/nutrition-technology/science-sourdough-and-how-jar-microbes-could-help-keep-your-bread-fresher-longer
14. https://youtu.be/C_mU2slhltI
15. https://youtu.be/yp_iaxtLCZs
16. https://www.scientificamerican.com/article/the-science-of-sourdough-how-microbes-enabled-a-pandemic-pastime/

Thanks to our monthly supporters

• Julie S
• Heather R
• Autoclave
• Chelsea M
• Dorien V
• Scott B
• Jessie R
• Ciara L
• J0HNTR0Y
• Jeannette N
• Cullyn R
• Erica B
• Elizabeth P
• Sarah M
• Rachel R
• Letila
• Katrina B
• Suzanne P
• Venus R
• Lyn S
• Jacob T
• Brian K
• Emerson W
• Kristina G
• Timothy P
• Steven B
• Chris and Claire S
• Chelsea B
• Avishai B
• Hunter R

Check out our website at chemforyourlife.com

Watch our episodes on YouTube

Find us on Instagram, Twitter, and Facebook @ChemForYourLife