the photo characteristic reaction between hydrogen and chlorine when carried out in a dimly lit room Represented by the following equation H2 +Cl2= 2HCl, enthalpy change = -XKJ/mol, sketch an energy profile diagram for the reaction

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?