Which describes the enthalpy change associated with an endothermic reaction?

it is negative because the enthalpy of the products is greater than the enthalpy of the reactants.

it is positive because the enthalpy of the products is greater than the enthalpy of the reactants.

it is negative because the enthalpy of the reactants is greater than the enthalpy of the products.

it is positive because the enthalpy of the reactants is greater than the enthalpy of the products.

In saturated organic compounds, all the bonds between carbon atoms are called?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.