Which of the following is true about fuel cells? a. they only produce energy in short bursts. b. they are inexpensive. c. they have never been built or used. d. they can be designed so that they emit no pollutants.

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro

[ou.03jthe pictures below show the wavelengths and intensities of electromagnetic radiations emitted by three stars, star 1, star 2, and star 3. intensity intensity- intensity- 1000 3500 6000 8500 11000 wavelength (a) star 1 1000 3500 6000 8500 11000 1000 3500 6000 8500 11000 wavelength (a) wavelength (a) star 2 star 3 which of these statements is correct about the color of the three stars? star 2 is white in color o star 2 is yellow in color star 1 and star 3 are yellow in color star 1 and star 3 are white in color

What is the value of the standard enthalpy of formation of an element in its most stable form?