C6 - Energy changes in chemical reactions
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What is an exothermic reaction? [2]
A reaction that transfers thermal energy to the surroundings leading to an increase in temperature
What is an endothermic reaction? [2]
A reaction that absorbs thermal energy from the surroundings leading to a decrease in temperature
What is enthalpy change? [1]
The difference between the energy required to break bonds and the energy given out when bonds are made
Explain an exothermic reaction in terms of bond breaking and bond making [2]
Less energy is absorbed to break bonds and more energy is released when bonds are made
Explain an endothermic reacion in terms of bond breaking and bond making [2]
More energy is absorbed to break bonds and less energy is released when bonds are made
What is activation energy? [1]
The minimum energy colliding particles need to have in order to react