Exothermic and endothermic reactions Flashcards
What is an endothermic reaction?
A reaction were heat is taken from the surroundings
Give an example of an endothermic reaction
Thermal decomposition of calcium carbonbate
Ammonium nitrate dissolving in water
Ethanoic acid reacting with sodium carbonate.
How can energy change be monitored?
You record the temperature at regular intervals. Also you measure the mass of the product at the beginning and end of the reaction.
What is an exothermic reaction?
A chemical reaction which releases energy by heat or light to the surroundings.
Explain how energy change in a reaction can be monitored.
Recording the temperature at regular intervals. Measuring the mass of the reactants and products at the beginning and end of the reaction.
Where is energy transfered in an exothermic reaction?
To the surrounding area
Name an example of an exothermic reaction
Combustion (burning)
Name another example of an exothermic reaction.
Many oxidation reactions e.g. Rusting
And another example of exothermic reactions.
Neutralisation reactions between acids and alkalis.
How is an exothermic reaction defined?
A reaction transferring energy to the surroundings.
What kind of heat flow is exothermic an example of? Positive or negative heat flow
Negative heat flow.
Exothermic reactions can occur spontaneously.True or false.
True!
A reaction can be both exothermic and endothermic. True or false.
False.
Name another example of an exothermic reaction.
Many oxidation reactions e.g. Rusting
What is a reversible reaction?
Reaction can go in both directions
Both the forward and reverse reactions can take place
