# Enthalpy Flash cards

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Define Exothermic
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
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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.
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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.
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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.
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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.
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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.
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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.
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## 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.

### 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.

### Card 5

#### Front

This is the enthalpy change that occurs when 1 mole of a substance is completely burned in oxygen under standard conditions.