This is the process of bonds being made, this process gives out energy to it's surroundings. It has a negative sign in front of any exothermic value. E.g. -238kj mol-1
1 of 7
Define Endothermic
This process is bond breaking and takes in energy from it's surroundings to break the bonds. Any endothermic value will always be positive.
2 of 7
Define Standard Conditions
Standard conditions refer to a specified temperature, a standard pressure of 1 atmospheric pressure, a standard concentration of 1 mol dm-3. These conditions must be kept equal to achieve the correct value of /\ H.
3 of 7
Define Energy transferred = C x M x /\T
C = The specific heat capacity of water (4.18jg-1 K-1), M = the mass of water in grams, /\T = the change in temperature of water.
4 of 7
Define the Standard Enthalpy change of Combustion
This is the enthalpy change that occurs when 1 mole of a substance is completely burned in oxygen under standard conditions.
5 of 7
Define the Standard Enthalpy change of a Formation
This is the enthalpy change when 1 mole of a compound is formed from its elements. Both the compound and elements must be in standard states and under standard conditions.
6 of 7
Define the Standard Enthalpy change of a Reaction
The enthalpy change when molar quantaties of reactants as stated in the equation react under standard conditions.
7 of 7
Other cards in this set
Card 2
Front
This process is bond breaking and takes in energy from it's surroundings to break the bonds. Any endothermic value will always be positive.
Back
Define Endothermic
Card 3
Front
Standard conditions refer to a specified temperature, a standard pressure of 1 atmospheric pressure, a standard concentration of 1 mol dm-3. These conditions must be kept equal to achieve the correct value of /\ H.
Back
Card 4
Front
C = The specific heat capacity of water (4.18jg-1 K-1), M = the mass of water in grams, /\T = the change in temperature of water.
Back
Card 5
Front
This is the enthalpy change that occurs when 1 mole of a substance is completely burned in oxygen under standard conditions.
Comments
No comments have yet been made