Glow Germ Detectives

None Some A Lot

|

|

4 Germ Hotspot Audit: Where Did Residue Survive? (Check all that glowed)

Under fingernails / cuticles Between fingers (web spaces) Around thumb joints Backs of hands / knuckles Center of palms Wrists / base of hand

5 Part 5: Detective Science Questions (Multiple Choice) Choose the Best Answer

1. Why did 20 seconds with soap wash away more glow germs than a quick 5-second water rinse?

A Water melts all germs away right away without any rubbing

B Soap sticks to oily germs, and 20 seconds of rubbing washes them down the drain

C Cold water makes germs fall asleep so they stop glowing in the dark

D Paper towels are the only tool that can take germs off skin

2. Under the blacklight, why were the most glow germs left under fingernails and around thumbs?

A Quick hand washing only rubs palms together, missing thumbs and hiding spots under nails

B Fingernails make sticky glue that holds onto germs

C The blacklight flashlight can only shine on fingernails

D Soap bubbles cannot touch fingers or thumbs

Forensic Handwashing Rule: Always scrub for 20 full seconds targeting thumbs, webs, and nails with soap lather!

Investigator Signature

Glow Germ Detectives • 5th Grade Health & Science Lab Page 2 of 2

Teacher Facilitation Prompts & Scientific Key

INSTRUCTIONAL PROTOCOL

Scripted Inquiry Questions (Ask at Key Moments)

During Transmission Powder Demo:

"Look at Detective Maya's hand—does it look clean? Now let's hit it with blacklight... What does this tell us about assuming surfaces are clean just because they look clean?"

During Post-Wash UV Inspection:

"Squad A, shine the light on your thumbs and fingernails. Why did water alone fail to remove the glow lotion? Squad B, look closely at your cuticles—even with soap, why did some glow survive?"

During Debrief:

"If a surgeon only washed for 5 seconds palm-to-palm, would you let them perform surgery? What are the three forgotten areas we must always scrub?"

The Science of Soap & Friction

Glow lotion uses an oil-based suspension to mimic natural skin sebum and bacterial lipid envelopes. Water is polar; oil is nonpolar (they repel). Soap molecules are amphiphilic: the hydrophobic tail binds to the oily germ casing, while the hydrophilic head binds to water, lifting pathogens off skin when rinsed.

UV Safety & Clean-Up Tips

• Eye Safety: Emphasize that UV blacklights emit long-wave UVA. Keep beams directed downward onto tables and hands only.
• Powder Cleanup: Glow powder transfers easily to clothes. Use wet wipes to clean desks before dismissing students.
• Skin Sensitivity: Glow lotion washes off completely with normal soap and warm water within 1-2 washes.

Lab Sheet Exemplar & Expected Student Findings ANSWER KEY

Expected Evidence Record Findings:

• • Squad A (5s Cold Rinse): Massive glow residue remaining (>75%), especially thick on backs, thumbs, and under fingernails ("A Lot" rating).
• • Squad B (20s Soap Scrub): Dramatically cleaner ("None" or "Some" residue). Lingering spots almost exclusively under cuticles/nails.

Part 5 Multiple Choice Key:

Q1: Correct: B (Soap sticks to oily germs, and 20 seconds of rubbing washes them down the drain). Distractor A is false; C is physically untrue; D ignores water and soap.

Q2: Correct: A (Quick palm-to-palm rubbing misses thumbs and hiding spots under nails). Distractors B, C, and D represent common student misconceptions.

Differentiation Support: Provide visual step cards at sinks for ELL/visual learners. For fast finishers, challenge them to test if hand sanitizer removes glow lotion compared to soap!

Grade 5 Ready

Glow Germ Detectives • 5th Grade Health & Science Lab Teacher Guide • Page 2 of 2