D. ( Neither ultrasonic nor infrasonic vibrations can be heard by humans. )
Answer:
None
Step-by-step explanation:
A high pH is caused by an excess of hydrogen ions over hydroxide ions.
Hydrogen ions are so small that they pass through the pores of an ordinary filter.
Thus, ordinary filtration has no effect on the pH of water.
Proteins are organic molecules composed of Carbon, Hydrogen, Oxygen and Nitrogen.
By calculating the negative of the slope of the curve of concentration of a reactant versus time at time t.
by calculating the slope of the curve of concentration of a product versus time at time t.
Answer: First, hydrogen is not as energy-dense as other fuels, meaning that you need a whole lot of it to do a little bit of work. ... Fuel cells are far more efficient than internal combustion engines, and a hydrogen fuel cell has cleaner emissions than an internal-combustion hydrogen engine.
Explanation: