Reacting Substances Flashcards
In order to react particles must
collide wIth enough energy
what is the activation energy.
The minimum amount of energy that particles must have to react.
In an exothermic reaction, energy is ———— the surroundings. The temperature of the surroundings therefore ———. The energy of the reactants is —— than the energy of the products.
released to, increases, higher
In endothermic reactions, the energy needed to break existing bonds is —— than the energy released when new bonds are formed
Greater
In exothermic reactions, the energy needed to break existing bonds is —— than the energy released when new bonds are formed
Less
The amount of energy required to make or break a bond is called the
Bond energy
Bond energy is measured in
kilojoules per mole or kcal/ mol
The enthalpy change can be described in what equation
energy change = energy in – energy out.
What does enthalpy mean
the measurement of energy in a thermodynamic system
in —– reactions more energy is released making new bonds than is taken in to break old bonds. this is indicated by a —– enthalpy change
Exothermic, negative.
in —– reactions less energy is released making new bonds than is taken in to break old bonds. this is indicated by a —– enthalpy change
Endothermic, positive
An electrochemical cell is a cell that uses ————— to generate electricity
Chemical reactions
In order to make an electrochemical work we need two metals which are
An electrolyte and a wire
the more reactive metal will become the —— of the end of the cell
anode (negative electrode)
the less reactive metal will become the ‘’ of the end of the cell
cathode (positive electrode)
