Energetics Flashcards
During a chemical reaction energy can be…
absorbed or emmited to/from the surroundings.
Exothermic
Energy released (temp. increase)
Endothermic
Energy absorbed (temp. decrease)
Enthalpy
The energy stored in chemicals that can be released as heat. Stored in bonds
What is the symbol and unit for enthalpy?
Unit: kJ/mol
Symbol: H
Ea=
activation energy, the minimum energy required for the particles to react, bonds to break.
Draw an energy profile for an exothermic reaction.
Draw an energy profile for an endothermic reaction. Than, identify the mistake in the shown one.
The Ea should be from the top of the little bump ALL the way to the reactants.
What is the equation for energy in a reaction
What is the specific heat capacity of water?
4.18 J/°C/g
Bond enthalpy
Quantity of energy needed to break 1 mol of a specific type of bond.
Is forming bonds endothermic or exothermic?
Froming bonds is exothermic and releases the same value of energy that was needed to break bonds.
Is breaking bonds endothermic or exothermic?
Energy is needed to break the electraostatic forces (covalent bonds) between the atoms. This process is endothermic
What types of bonds do the products of exothermic reactions have compared to the reactants?
in exothermic reactions, the bonds formed in the products are stronger than the bonds broken in the reactants.
What types of bonds do the products of endothermic reactions have compared to the reactants?
In endothermic reactions the bonds broken in the reactants are stronger than the bonds formed in the products.
Draw the setup for finding the ΔH in an experiment
Draw the setup for finding the ΔHc in an experiment
