18 Questions
What is the result of an exothermic process on the system and its surroundings?
The system gets colder, and the surroundings get warmer.
What does the energy value represent in an exothermic process?
The energy released from the system.
What is the purpose of a reaction profile diagram?
To determine the endothermicity or exothermicity of a reaction.
What is the minimum amount of energy required by reactant molecules to initiate a reaction?
Activation energy (Ea).
What is the difference between an exothermic and an endothermic process?
Exothermic processes release heat, while endothermic processes absorb heat.
What is a limitation of reaction profile diagrams?
They are conceptual constructs based on the collision model or theory of particles.
Which term describes chemical reactions in which products can decompose to form back the reactants?
Reversible reactions
At equilibrium in a reversible reaction, the forward and reverse reactions occur at what rate?
Equal rate
What does a double-sided arrow in a chemical reaction indicate?
The reversibility of the reaction
What is the equilibrium constant specific to concentration labeled as?
Kc
In a reversible reaction involving N2O4 and NO2, what does the equilibrium constant express?
[NO2]/[N2O4]
At what point in a reversible reaction do both the forward and reverse reactions occur at equal rates?
Chemical equilibrium
What is indicated by the apex of the curve in a reaction profile diagram?
The transition state or activated complex
In a reaction profile diagram, what can be inferred about the energy of the product molecules compared to the reactant molecules in an exothermic reaction?
The product molecules have lower energy
What is the duration of the activated complex or transition state?
About 1 picosecond
What is the purpose of studying thermodynamics in chemistry?
To predict the spontaneity of a reaction
What is the significance of the transition state or activated complex in reactions with elementary steps?
It corresponds to the formation of an unstable intermediate product
What is the importance of knowing the spontaneity of a reaction in industrial production of chemicals?
To ensure the feasibility of the process
Test your knowledge on reaction profile diagrams for exothermic and endothermic reactions. Learn about how product molecules have different energies compared to reactant molecules, and understand the significance of transition states in chemical reactions.
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