Standard enthalpy changes 2.3.3.and 2.3.4. as unit 2 ocr

define standard conditions and the types of enthalpy changes

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What is Activation energy?
It is the minimum energy required to start a reaction by breaking of bonds
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Complete this sentence. In the enthalpy profile diagrams - The activation energy is always the....
input of energy from the reactants to the top of the energy barrier
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what is the standard state?
it is the physical state of the element in standard condition (above)
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What is the definition of enthalpy change of reaction?
is the enthalpy change that accompanies the reaction in the molar quantities expressed in a chemical equation under standard condition, all reactants and products being in their standard states.
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What is the standard enthalpy of combustion?
is the enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their gaseous states
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What is the enthalpy change of formation?
the enthalpy change that takes place when one mole of a compound its standard state is formed from its constituent elements under standard conditions in their standard state.
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what is the enthalpy change of formation defined as?
0 KJ mol -1
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what is the equation to work out energy change? and what does it stand for?
mCΔT m- mass of the surroundings, C - specific heat capacity, ΔT - temperature change
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Card 2

Front

Complete this sentence. In the enthalpy profile diagrams - The activation energy is always the....

Back

input of energy from the reactants to the top of the energy barrier

Card 3

Front

what is the standard state?

Back

Preview of the front of card 3

Card 4

Front

What is the definition of enthalpy change of reaction?

Back

Preview of the front of card 4

Card 5

Front

What is the standard enthalpy of combustion?

Back

Preview of the front of card 5
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