Endo And Exothermic Reactions Flashcards
(24 cards)
What is an endothermic reaction?
An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.
What is an exothermic reaction?
An exothermic reaction is a chemical reaction that releases heat to its surroundings.
True or False: Endothermic reactions result in a temperature decrease in the surroundings.
True
True or False: Exothermic reactions require energy input to proceed.
False
Fill in the blank: In an endothermic reaction, the enthalpy change (ΔH) is __________.
positive
Fill in the blank: In an exothermic reaction, the enthalpy change (ΔH) is __________.
negative
What is an example of an endothermic reaction?
Photosynthesis is an example of an endothermic reaction.
What is an example of an exothermic reaction?
Combustion of fuels is an example of an exothermic reaction.
Which type of reaction typically feels cold to the touch?
Endothermic reactions typically feel cold to the touch.
Which type of reaction typically feels warm or hot to the touch?
Exothermic reactions typically feel warm or hot to the touch.
What happens to the energy in the products of an exothermic reaction compared to the reactants?
The energy in the products is lower than in the reactants.
What happens to the energy in the products of an endothermic reaction compared to the reactants?
The energy in the products is higher than in the reactants.
True or False: All combustion reactions are exothermic.
True
True or False: The melting of ice is an endothermic process.
True
What is the primary driving force for endothermic reactions?
The absorption of heat energy from the surroundings.
What is the primary driving force for exothermic reactions?
The release of heat energy to the surroundings.
Multiple Choice: Which of the following is NOT an example of an exothermic reaction? A) Respiration B) Photosynthesis C) Combustion
B) Photosynthesis
Multiple Choice: Which of the following processes is endothermic? A) Ice melting B) Fireworks exploding C) Wood burning
A) Ice melting
What role do catalysts play in endothermic and exothermic reactions?
Catalysts speed up the reaction rate without being consumed, affecting both types of reactions.
True or False: Endothermic reactions can occur spontaneously.
True, if the overall change in free energy is negative.
What is the term for the energy required to start a chemical reaction?
Activation energy
What is a common use of exothermic reactions in everyday life?
Heating systems and hand warmers often utilize exothermic reactions.
What is a common use of endothermic reactions in everyday life?
Endothermic reactions are used in instant cold packs.
Fill in the blank: The overall energy change in a chemical reaction is determined by the difference between the energy of __________ and the energy of __________.
reactants; products
