a reaction which transfers energy to the surroundings (the reaction releases energy)
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What is an indication of an exothermic reaction
rise in temperature e.g. combustion + neutralisation reactions (acid + alkali)
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3
What is an Endothermic reaction
a reaction which takes in energy from the surroundings
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4
what is an indication of an endothermic reaction
Fall in temperature e.g. sports injury packs which cool instantly
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5
Required Practical for energy transfer
Thermometer in reagents in a polystyrene cup into a beaker of cotton wool and measuring temperature before and after reaction ( this practical can also be used to investigate how different variables affect this e.g. mass or concentration of reactants)
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Reagents
pretty similar Reactants
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What are reaction profiles
Diagrams that show relative energies of reactants and products and how they change in a reaction
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what type of reaction is shown on this reaction profile
Exothermic
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what type of reaction is shown on this reaction profile
Endothermic
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What does the difference in height represent on a reaction profile
The energy released/absorbed depending on the type of reaction
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what is required in order to break bonds
more energy being used to break bonds than create them
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What type of reaction breaks bonds between two chemicals
Endothermic
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What type of reaction forms bonds
Exothermic
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What is the overall energy change in bonds
the sum of energies needed to break bonds in reactants minus the energy released when new bonds are formed in the products
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