Properties and Chemical Reactions
Oxygen is one of the reactants,
and a large amount of energy is
released.
Combustion
A balanced chemical equation which shows the energy change for the reaction
Thermochemical equation
Activation energy
The SI unit for heat and energy is
Joule
These reactions take place on their own under a given set of conditions
Spontaneous
Name the types of observable energy released in a chemical reaction.
Heat, light, sound, electricity
Which law is represented in a balanced chemical equation?
Law of Conservation of Mass
In a given chemical reaction, the energy of the products is greater than the energy of the reactants.
Endergonic - Energy is absorbed in the reaction
Gibbs free energy
kJ (kilojoules)
Endergonic
Non-spontaeous
Triple bonds have (greater/less) bond energy than single bonds. Single bonds are (longer/shorter) than double bonds.
Greater - Longer
In 8C5H8, the coefficient is
8
Table salt dissolves spontaneously in water, however it absorbs enery from the water - making it ______________.
Endothermic
Temperature (T)
Kelvin
More stable after the reaction takes place.
Spontaneous (Exergonic)
As bond length increases, bond energy ________.
Decreases
In C6H12O6 the subscript of Hydrogen is
The two driving forces of a reaction
Entropy and Enthalpy
Enthalpy Change
kJ/mol or kJ mol-1 -- Kilojoules per mol
________ must be provided for the non-spontaneous reactions to proceed.
energy
List the three factors which affect the strength of a chemical bond.
Bond Order, Bond Length, Bond Energy
Is the following chemical equation balanced?
2C3H6--->CH2+C5H10
Yes
What do the symbols n, m & M represent?
n=number of atoms/particles, etc.
m=mass
M= Molar Mass
Entropy change
kJ/K or kJ K-1 (Kilojoules per Kelvin)
Entropy is positive and Enthalpy is negative
Spontaneous