Flashcards in Energetics Deck (10):
What is a chemical reaction called when heat energy is taken in?
What are some examples of exothermic changes?
• The reactions of metals with acids.
• Neutralisation reactions.
• Adding water to calcium oxide.
What does ΔH represent?
Molar enthalpy change.
Is ΔH in exothermic reactions positive or negative?
Is ΔH in endothermic reactions positive or negative?
Give energy out to the surroundings - products have less energy than reactants.
Take energy in from the surroundings - products have more energy than the reactants.
Breaking of bonds is...
Endothermic - requires energy.
Making of bonds is...
Exothermic - releases energy.