If the value of ΔH is positive for a reaction, it means that the reaction is?
- exothermic
-
endothermic
- spontaneous
- slow
The correct answer is: B
Explanation
- Endothermic reactions are chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
- A system of reactants that absorbs heat from the surroundings in an endothermic reaction has a positive ΔH.
- examples of endothermic processes:
- Melting ice cubes.
- Melting solid salts.
- Sublimation of dry ice into carbon dioxide gas.
- Evaporating liquid water.