chemistry

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  • Created by: sami2501
  • Created on: 07-04-14 20:00
whats an exothermic reaction
heat is given out so the temperature rises
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whats an endothermic reaction
heat is taken in so the temperature drops
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define enthalpy change
heat change at constant pressure under standard conditions (100kPa and 298K)
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in an exothermic reaction is the enthalpy change negative or positive
negative
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in an endothermic reaction is the enthalpy change negative or positive
positive
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define standard molar enthalpy of formation
when one mole of substance is formed from its constituent elements under standard conditions, all reactants and products in their standard states
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define molar enthalpy of combustion
when one mole of substance is completely burned in oxygen under standard conditions, all reactants and products in their standard states
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what is the enthalpy change equation
= mass of substance x specific heat capacity x temperature change
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whats a neutralisation reaction
acid + alkali = salt + water (exothermic)
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what is a displacement reaction
when a metal is more reactive than another it will displace it
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heat loss can be allowed for by doing what
plotting a cooling curve and adding line of best fit
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what is Hess's law
enthalpy change for a reaction is the same whatever route taken from reactants to products
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what are allotropes
pure elements which can exist in different physical forms
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define bond dissociation enthalpy
enthalpy change needed to break a covalent bond (species in gaseous state)
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define mean bond enthalpy
average bond enthalpy for a given bond taken from a range of different compounds
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whats required for a successful collision
right orientation and enough energy
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what does maxwell-boltzmann distribution tell us
no particles have no energy, most have intermediate energies, and few have high energies
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where is the most probable energy on a M-B distribution curve
at the peak
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what does the M-B curve look like with an increased temperature
the peak is lower and moves to the right
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how does a catalyst work
provides a different pathway for the reaction with lower Ea
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Card 2

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whats an endothermic reaction

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heat is taken in so the temperature drops

Card 3

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define enthalpy change

Back

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Card 4

Front

in an exothermic reaction is the enthalpy change negative or positive

Back

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Card 5

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in an endothermic reaction is the enthalpy change negative or positive

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