chemistry 0.0 / 5 ? Chemistryunit 2ASAQA Created by: sami2501Created on: 07-04-14 20:00 whats an exothermic reaction heat is given out so the temperature rises 1 of 20 whats an endothermic reaction heat is taken in so the temperature drops 2 of 20 define enthalpy change heat change at constant pressure under standard conditions (100kPa and 298K) 3 of 20 in an exothermic reaction is the enthalpy change negative or positive negative 4 of 20 in an endothermic reaction is the enthalpy change negative or positive positive 5 of 20 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 6 of 20 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 7 of 20 what is the enthalpy change equation = mass of substance x specific heat capacity x temperature change 8 of 20 whats a neutralisation reaction acid + alkali = salt + water (exothermic) 9 of 20 what is a displacement reaction when a metal is more reactive than another it will displace it 10 of 20 heat loss can be allowed for by doing what plotting a cooling curve and adding line of best fit 11 of 20 what is Hess's law enthalpy change for a reaction is the same whatever route taken from reactants to products 12 of 20 what are allotropes pure elements which can exist in different physical forms 13 of 20 define bond dissociation enthalpy enthalpy change needed to break a covalent bond (species in gaseous state) 14 of 20 define mean bond enthalpy average bond enthalpy for a given bond taken from a range of different compounds 15 of 20 whats required for a successful collision right orientation and enough energy 16 of 20 what does maxwell-boltzmann distribution tell us no particles have no energy, most have intermediate energies, and few have high energies 17 of 20 where is the most probable energy on a M-B distribution curve at the peak 18 of 20 what does the M-B curve look like with an increased temperature the peak is lower and moves to the right 19 of 20 how does a catalyst work provides a different pathway for the reaction with lower Ea 20 of 20
Comments
No comments have yet been made