If the enthalpy (∆H) is negative the reaction is .
endothermic
neutral
exothermic
PLEASE HELP

What does earth’s rotation on its axis cause? the tides night and day passing of years phases of the moon

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

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.