Which elements do hydrogen fuel cells combine to produce electricity?

A) Hydrogen and Oxygen

B) Hydrogen and Carbon

C) Hydrogen, Oxygen and Nitrogen

D) Hydrogen, Carbon, and Nitrogen

A gas has a volume of 4.54 L at 1.65 atm and 75.0°C. At what pressure would the volume of the gas be increased to 5.33 L if the temperature is increased to 103°C?

What is a compound? A. a mixture of two or more elements that do not combine chemically B. a pure substance in which the atoms of three or more elements are chemically combined C.

Stannous fluoride is formed when a tin cation with charge 4 + combines with a fluorine anion with charge 1-. How will you derive the formula for stannous fluoride?

A worm, a squid, an octopus, and a beetle are all O insects arthropods invertebrates amphibiens

When 2.50g of hydrochloric acid reacts with 1.50g of potassium hydroxide to yiel potassium chloride and water, how many grams of potassium chloride are produced? What is the limiting reactant between hydrochloric acid and potassium hydroxide?

On melting of ice, there is a decrease in volume instead of increase. Why?

When a dolphin jumps, it moves its muscles and chemical potential energy is converted to kinetic energy. Some of this energy is lost to the dolphin. Explain why this phenomenon does not violate the Law of Conservation of Energy.

If a bat with a mass of 5 kg and acceleration of 2 m/s2 hits a ball whose mass is 0.5 kg in the forward direction, what is the reaction force of the ball on the bat? A) 0 N, forward B) 10 N, forward C) 10 N, backward D) 0.5 N, upward

Which statement best explains why heating a liquid affects its viscosity?

Calculate the ph of a 3.78*10-3 m solution of naf, given that the ka of hf = 6.80 x 10-4 at 25°c.