The first one. observe that numerator and denominator are of same type in all other cases. but in 1st one, its length/volume which is crazy. how can one equate length to volume ? no way.
Answer:
controlled: 2 drops of food coloring
independent: temperature of water
dependent: rate of diffusion
Explanation:
A controlled variable doesn't change throughout the whole experiment, a independent variable is something being tested, and a dependent variable is the results
That is the molecular formula of sulfur dioxide
Carbon monoxide is a colorless, odorless, tasteless gas produced by burning gasoline, wood, propane, charcoal or other fuel. Improperly ventilated appliances and engines, particularly in a tightly sealed or enclosed space, may allow carbon monoxide to accumulate to dangerous levels.
