The document discusses energy changes that occur during chemical reactions. It defines exothermic reactions as those where energy is transferred to the surroundings, meaning the products have less energy than the reactants. Endothermic reactions are defined as those where energy is taken in from the surroundings, so the products have more energy than the reactants. It also discusses reaction profiles and how they can show the relative energies of reactants and products, as well as the activation energy and overall energy change. Bond breaking requires energy while bond formation releases energy.
The document discusses energy changes that occur during chemical reactions. It defines exothermic reactions as those where energy is transferred to the surroundings, meaning the products have less energy than the reactants. Endothermic reactions are defined as those where energy is taken in from the surroundings, so the products have more energy than the reactants. It also discusses reaction profiles and how they can show the relative energies of reactants and products, as well as the activation energy and overall energy change. Bond breaking requires energy while bond formation releases energy.
The document discusses energy changes that occur during chemical reactions. It defines exothermic reactions as those where energy is transferred to the surroundings, meaning the products have less energy than the reactants. Endothermic reactions are defined as those where energy is taken in from the surroundings, so the products have more energy than the reactants. It also discusses reaction profiles and how they can show the relative energies of reactants and products, as well as the activation energy and overall energy change. Bond breaking requires energy while bond formation releases energy.
The document discusses energy changes that occur during chemical reactions. It defines exothermic reactions as those where energy is transferred to the surroundings, meaning the products have less energy than the reactants. Endothermic reactions are defined as those where energy is taken in from the surroundings, so the products have more energy than the reactants. It also discusses reaction profiles and how they can show the relative energies of reactants and products, as well as the activation energy and overall energy change. Bond breaking requires energy while bond formation releases energy.
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AQA GCSE
Notes and Questions
Energy Changes Energy transfer:
Energy is c___________ in chemical reactions. The amount of
e______ in the u________ at the end of a chemical reaction is the
same as b_________. If a reaction t_________ energy to the
surroundings the p__________ molecules must have l____ e_____
than the r_________, by the amount transferred.
1. Draw the two different energy diagrams:
2. Define an exothermic reaction:
3. Define an endothermic reaction:
4. Identify the following as either exothermic or endothermic reactions. How did you decide? 5. Draw how you might practically assess whether or not a reaction is exothermic or endothermic? Reaction Profiles:
Chemical reactions can only occur when r_________ particles
c________ with each other and with s___________ e_______.
6. Define the Activation Energy?
Reaction profiles can be used to show the relative energies of the
reactants and products, the activation energy and the overall energy change.
7. Draw the two different types of reaction profile?
The energy change of reactions:
During a chemical reaction:
energy must be supplied to b______ b______s in the reactants. energy is released when b_____ in the products are f________.
8. Explain an endothermic reaction in terms of bond changes?
9. Explain an exothermic reaction in terms of bond changes?
10. How do you calculate the energy released during a reaction? 11. Calculate the energy in the following reaction? 12. Calculate the energy in the following reaction? 13. Calculate the energy in the following reaction?