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level: Energy Changes in Reactions

Questions and Answers List

level questions: Energy Changes in Reactions

QuestionAnswer
Processes occurring during a chemical reaction where new bonds are formed and existing bonds are broken.Bond Formation and Breaking
What happens during a chemical reaction in terms of bonds?New bonds are formed, and existing bonds are broken during a chemical reaction.
The energy needed to break existing bonds in a chemical reaction.Energy Requirement for Breaking Bonds
Is breaking bonds endothermic or exothermic, and why?Breaking bonds is endothermic because it requires energy. Endothermic reactions absorb energy from the surroundings.
The relationship between endothermic reactions and the breaking of bonds, where energy is absorbed from the surroundings.Endothermic Reactions and Bond Breaking
How is breaking bonds related to endothermic reactions?Breaking bonds is endothermic, meaning it takes in energy from the surroundings.
The energy released when new bonds are formed in a chemical reaction.Energy Release during Bond Formation
Is making bonds endothermic or exothermic, and why?Making bonds is exothermic because it releases energy. Exothermic reactions transfer energy to the surroundings.
The relationship between exothermic reactions and the formation of bonds, where energy is released to the surroundings.Exothermic Reactions and Bond Formation
How is making bonds related to exothermic reactions?Making bonds is exothermic, meaning it releases energy to the surroundings.
The amount of energy required to break a bond or the energy released when a bond is formed.Bond Energy
What does the term "bond energy" refer to in a chemical context?Bond energy is the energy needed to break a bond or the energy released when a bond forms.
The concept that different types of bonds contain different amounts of energy.Variation in Bond Energy
Do all types of bonds have the same amount of energy?No, different types of bonds contain different amounts of energy.
The idea that every type of bond possesses its own specific bond energy.Bond Energy as a Property of Each Bond
Does each type of bond have a unique bond energy, or is it the same for all bonds?Each type of bond has its own specific bond energy.
The unit in which bond energies are quantified, typically expressed in kilojoules per mole (kJ mol⁻¹).Measurement Unit for Bond Energies
What is the standard unit for measuring bond energies?Bond energies are measured in kilojoules per mole (kJ mol⁻¹).
The application of bond energies to determine the overall energy change in a chemical reaction, indicating whether it is exothermic or endothermic.Use of Bond Energies in Energy Change Calculation
How can bond energies be employed to assess the overall energy change in a reaction?By adding up the bond energies of the reactants and products, one can determine whether a reaction is exothermic or endothermic.
The process of finding the net energy change in a reaction by subtracting the total bond energies of the reactants from the total bond energies of the products.Overall Energy Change Calculation
How do you calculate the overall energy change in a reaction using bond energies?Subtract the total bond energies of the reactants from the total bond energies of the products.
The condition in which the energy released during the formation of new bonds is greater than the energy needed to break existing bonds, indicating an exothermic reaction.Exothermic Reaction Criterion
What criterion determines whether a reaction is exothermic based on bond energies?If the energy released from making new bonds is more than the energy needed to break bonds, the reaction is exothermic.
An illustration involving the combustion of methane to exemplify the calculation of overall energy change using bond energies.Example: Combustion of Methane
Provide an example of using bond energies to determine the overall energy change in a reaction.In the combustion of methane, the energy released from forming bonds is greater than the energy needed to break bonds, making the reaction exothermic.
The computation of the overall energy change in the combustion of methane using bond energies.Calculation of Overall Energy Change in Methane Combustion
The characteristic of exothermic reactions having negative overall energy changes, indicating the transfer of energy to the surroundings.Exothermic Reaction Energy Change
The condition indicating that a reaction is endothermic when more energy is needed to break bonds than is released by forming bonds.Criterion for Endothermic Reactions
What is a common feature of the overall energy changes in exothermic reactions?Exothermic reactions always have negative overall energy changes, signifying the transfer of energy to the surroundings.
What criterion determines whether a reaction is endothermic in relation to bond energies?If more energy is required to break bonds than is released by forming bonds, the reaction is endothermic.
The application of bond energies to determine the overall energy change in a chemical reaction, specifically for endothermic reactions.Use of Bond Energies in Energy Change Calculation for Endothermic Reactions
How can bond energies be used to assess the energy change in endothermic reactions?If more energy is needed to break bonds than is released by forming bonds, the reaction is endothermic.
An illustration involving the breakdown of water to exemplify the calculation of overall energy change using bond energies for an endothermic reaction.Example: Breakdown of Water
Provide an example of using bond energies to determine the overall energy change in an endothermic reaction.In the breakdown of water, more energy is needed to break bonds than is released by forming bonds, making the reaction endothermic.
The computation of the overall energy change in the breakdown of water using bond energies for an endothermic reaction.Calculation of Overall Energy Change in Water Breakdown
The characteristic of endothermic reactions having positive overall energy changes, indicating the absorption of energy from the surroundings.Positive Energy Change in Endothermic Reactions
What is a common feature of the overall energy changes in endothermic reactions?Endothermic reactions always have positive overall energy changes, signifying the absorption of energy from the surroundings.
The minimum amount of energy required for particles to react with each other in a chemical reaction.Activation Energy.
What is the term for the minimum energy needed for particles to react in a chemical reaction?Activation energy.
The requirement that particles must collide with sufficient energy for a chemical reaction to occur.Collisions and Activation Energy
What is necessary for particles to undergo a chemical reaction in terms of collisions?Particles must collide with enough energy for a chemical reaction to occur.
A graph that depicts the changes in energy during a chemical reaction, including activation energy and energy levels of reactants and products.Reaction Profile
What is a reaction profile, and what information does it provide about a chemical reaction?A reaction profile is a graph illustrating the changes in energy during a chemical reaction, including activation energy and energy levels of reactants and products.
In an exothermic reaction, the products are at a lower energy level than the reactants.Exothermic Reaction and Energy Levels
How do the energy levels of products compare to those of reactants in an exothermic reaction?In an exothermic reaction, the products are at a lower energy level than the reactants.
The energy difference between the reactants and products in an exothermic reaction is the amount transferred to the surroundings.Energy Difference in Exothermic Reactions
What does the difference in energy levels between reactants and products represent in an exothermic reaction?The difference in energy is the amount transferred to the surroundings.
In an endothermic reaction, the products are at a higher energy level than the reactants.Endothermic Reaction and Energy Levels
How do the energy levels of products compare to those of reactants in an endothermic reaction?In an endothermic reaction, the products are at a higher energy level than the reactants.
The energy difference between the reactants and products in an endothermic reaction is the amount taken in from the surroundings.Energy Difference in Endothermic Reactions
What does the difference in energy levels between reactants and products represent in an endothermic reaction?The difference in energy is the amount taken in from the surroundings.