Chemistry
WAEC 2019
If the value of ΔH is positive for a reaction, it means that the reaction is?
-
A.
exothermic
-
B.
endothermic
-
C.
spontaneous
-
D.
slow
Correct Answer: Option 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.
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