C5 Energy Changes
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<p>What is an <b>Exothermic</b> reaction?</p>
<p>An exothermic reaction is a reaction that transfers energy to the surroundings</p>
<p>What are some examples of exothermic reactions?</p>
<ul><li>Combustion reactions</li><li>Oxidation reactions</li><li>Most neutralisation reactions</li><li>Respiration</li></ul>
<p>What happens to the temperature of the surroundings during an exothermic reaction?</p>
<p>The temperature of the surroundings increase during an exothermic reaction</p>
<p>What is an <b>Endothermic</b> reaction?</p>
<p>An endothermic reaction is a reaction where energy is transferred from the surroundings</p>
<p>What happens to the temperature of the surroundings during an endothermic reaction?</p>
<p>he temperature of the surroundings decrease during an endothermic reaction</p>
<p>State a use of endothermic reactions</p>
<ul><li>Instant cooling ice packs</li></ul>
<p>State two uses of exothermic reactions</p>
<ul><li>Self-heating cans</li><li>Hand warmers</li></ul>
<p>What is a reaction profile?</p>
<p>A reaction profile is a diagram that shows whether the reactants have more or less energy than the products and the overall energy change of a reaction</p>
<p>What is <b>activation energy</b>?</p>
<p>Activation energy is the energy required to break bonds to start a reaction</p>
<p>Why does a reaction profile always go up at the start?</p>
<p>The reaction always starts with bonds being broken</p>
<p>Why does a reaction profile always go down at the end?</p>
<p>The reaction always ends with bonds being made</p>
<p>How can you tell if a reaction is exothermic?</p>
<p>If the reactants have more energy than the products, an exothermic reaction has taken place</p>
<p>How can you tell if a reaction is endothermic?</p>
<p>If the reactants have less energy than the products, then an endothermic reaction has taken place</p>
<p>What type of reaction makes bonds?</p>
<p>Exothermic. Energy is released when chemical bonds are formed</p>
<p>What type of reaction breaks bonds?</p>
<p>Endothermic. Chemical bonds are strong so energy needs to be put in to break them</p>
<p>How do you work out the overall energy change of a reaction?</p>
<p>Work out the energy needed to break all the bonds in the reactants and the energy released to form all the bonds in the products</p>
<p>How do you work out the energy change from a reaction profile?</p>
<p>Calculate the difference between the energy of the reactants and the energy of the products</p>
<p>How do you work out the activation energy from a reaction profile?</p>
<p>The difference between the energy of the reactants and the peak of the profile</p>
<p>What is <b>bond energy</b>?</p>
<p>Bond energy is the amount of energy required to break a particular type of bond</p>
<p>What is a <b>Chemical Cell</b>?</p>
<p>A chemical cell is a unit that contains chemicals which produce electricity through a reaction</p>
<p>What are the main components of a cell?</p>
<p>An Anode & Cathode (made of two different metals) and an electrolyte</p>
<p>What is an <b>electrolyte<b>?</b></b></p>
<p>An electrolyte is a solution containing ions</p>
<p>What does the voltage of cell depend on?</p>
<p>The type of electrode and the electrolyte</p>
<p>What is a <b>battery</b>?</p>
<p>Two or more cells connected in series</p>