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

If the crystal pattern for halite expanded in every direction, how many chloride ions would surround each sodium ion

Which of the following statements about cytokines is FALSE? Which of the following statements about cytokines is FALSE? They are soluble proteins or glycoproteins. They are chemical communication between cells. Some have multiple functions.

HClO4 acid solution has a concentration of 5 Molarity. Calculate the concentration of this solution in 1. Percentage by weight 2. Molar fractions

Can you find a salmander in the desert or rainforest?

You need a 35% alcohol solution. on hand, you have a 405 ml of a 30% alcohol mixture. you also have 80% alcohol mixture. how much of the 80% mixture will you need to add to obtain the desired solution?

What is in a banana? give me specifics?!

When 17.28 mL of a 0.078 M aqueous solution of Na2SO4 is combined with 11.30 mL of a 0.20 M aqueous solution of NaCl and 7.84 mL of a 0.26 M aqueous solution of KCl, what is the total concentration of Na + in the combined solution?

What mass of carbon can 3000 J of energy raise from 12°C to 40°C?

How do you balance __Mg + __HCl - - > __MgCl2 + ___ H2

How many grams of methane, CH4 are produced from the complete reaction of 5.15 moles of carbon monoxide, CO