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Explain how holding your breath changes your blood chemistry, including the chemical formula
Why would adding soap to a pond make water strider insects fall in?
Why does capillary action only take place in very thin spaces?
Acid rain is a combination of what two things?
If the pH of acid rain were 4, how much stronger than water is this?
If the [H+} of a sample were 1ee-8, what would be the pH and pOH?
Is this an acid or a base?
What would be the pH and pOH if the hydrogen concentration was 3ee-4?
Ocean acidification is a multi-step process. Explain
Why would ocean acidification impact corals (chemical, not heat)
Phineas climbs the Eiffel tower and finds a relic with 12.5% of the original radioactivity of Sr90/38. How old is the sample?
While surfing a tidal wave with his microscope, Ferb notices small bacteria multiplying with a doubling time of 3 hours. How many hours will it take to have 64 times the original amount?
The population of Doofania (Dr. Doofenshmirtz's home) has a growth rate of 3.5%. How many years will it take to double the population there?
If the original population in Doofania is 256, how many people will there be in 28 years?
How many if the original population was 512?
How many if the rate were doubled, with original populations of 256 and 512?
Dr. Doofenshmirtz creates a radiation proof suit out of cardboard, with an aluminum foil hat and lead underwear. What parts of him are safe from what types of radiation?
Dr. Doofenshmirtz gave up smoking long ago, but is still in danger from lung cancer. What radioactive element is in cigarette smoke that may have caused this, and how?
Candace finds a platypus that Phineas and Ferb have discovered hiding in their garage, along with ancient bones from other platypii. If the bones are about 15000 years old, how much of the original carbon 14 is in these bones? Where's Perry?
Phineas is explaining to Isabella the difference between rate and base in exponential growth. How does he do this?

Whose brain was Phineas and Ferb looking for?