Exothermic Breathing Lab

EVIDENCE OF ENERGY RELEASE

STUDENT RECORD SHEET

NAME:

DATE:

Test 1: Thermal Output

Procedure:

Observations (Resting)

Observations (Post-Activity)

Analysis: Why did the temperature increase after exercise?

Bromothymol Blue (BTB) is an indicator that turns from blue to yellow when carbon dioxide (CO₂) is present.

Visual Observation

START (BTB)

After Exhaling

What color did the BTB turn?

Where did this CO₂ come from?

Glucose + O₂ → CO₂ + H₂O + ENERGY

Explain why cellular respiration is considered "exothermic" using evidence from the two tests above: