Exo/Endothermic Reactions Flashcards
(26 cards)
What is an exothermic reaction?
A reaction that releases energy, usually in the form of heat.
What is an endothermic reaction?
A reaction that absorbs energy from its surroundings.
True or False: Exothermic reactions feel cold to the touch.
False
Give an example of an exothermic reaction.
Combustion of fuels, such as burning wood or gasoline.
Fill in the blank: In an endothermic reaction, the temperature of the surroundings ______.
decreases
What is the general equation for a chemical reaction?
Reactants → Products
True or False: Photosynthesis is an example of an exothermic reaction.
False
What happens to the energy in an exothermic reaction?
It is released into the environment.
What happens to the energy in an endothermic reaction?
It is absorbed from the environment.
Which type of reaction typically has a positive enthalpy change?
Endothermic reaction
Which type of reaction typically has a negative enthalpy change?
Exothermic reaction
Provide a common application of exothermic reactions.
Heat packs or thermite reactions.
True or False: All chemical reactions are either exothermic or endothermic.
True
What is a common characteristic of exothermic reactions regarding temperature?
They increase the temperature of the surroundings.
What is a common characteristic of endothermic reactions regarding temperature?
They decrease the temperature of the surroundings.
Give an example of an endothermic reaction.
Dissolving ammonium nitrate in water.
What role do catalysts play in exothermic and endothermic reactions?
They speed up the reaction without being consumed.
Fill in the blank: The energy change in a reaction is measured in ______.
kilojoules (kJ)
What is the primary driving force behind chemical reactions?
The tendency to reach a lower energy state.
True or False: Exothermic reactions are always faster than endothermic reactions.
False
What type of reaction is melting ice?
Endothermic reaction
What type of reaction is the combustion of natural gas?
Exothermic reaction
In which type of reaction is energy absorbed from the surroundings?
Endothermic reaction
What is the term for the energy required to start a reaction?
Activation energy
