Exothermic And Endothermic Reactions Flashcards
(12 cards)
Whenever that is a chemical reaction, there are changes in what?
Energy
What happens to energy in chemical reactions?
It’s moved around
What is an exothermic reaction?
An exothermic reaction is one which transfers energy to the surroundings, usually by heating. This is shown by a rise in temperature
Give an example of an exothermic reaction
Burning fuels (combustion), neutralisation, oxidation
What is an endothermic reaction?
An endothermic reaction is one which takes in energy from the surroundings. This is shown by a fall in temperature.
Give an example of an endothermic reaction
Thermal decomposition
How can energy transfer be measured?
By taking the temperature of the regions mixing them in a polystyrene cup and measuring the temperature of the solution at the end of the reaction
What’s the problem with energy measurements?
Energy loss to the surroundings
True or false? Different chemical bonds hold different amounts of energy.
True
Does the products of an exothermic reaction have more or less energy than the reactants?
Less
Does the products of an endothermic reaction have more or less energy than the reactants?
More
