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Year 11 Exam  >  Year 11 Tests  >  Test: Enthalpy Change & Activation Energy - Year 11 MCQ

Test: Enthalpy Change & Activation Energy - Year 11 MCQ


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10 Questions MCQ Test - Test: Enthalpy Change & Activation Energy

Test: Enthalpy Change & Activation Energy for Year 11 2024 is part of Year 11 preparation. The Test: Enthalpy Change & Activation Energy questions and answers have been prepared according to the Year 11 exam syllabus.The Test: Enthalpy Change & Activation Energy MCQs are made for Year 11 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Enthalpy Change & Activation Energy below.
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Test: Enthalpy Change & Activation Energy - Question 1
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What term describes the minimum energy required for a successful reaction to occur, influenced by factors such as energy, orientation, and collision frequency?

Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 1
Activation energy is the term used to describe the minimum amount of energy required for a chemical reaction to occur. It represents the energy threshold that colliding particles must overcome for the reaction to be successful. Higher activation energies indicate reactions that require more initial energy input. This concept is crucial in understanding the kinetics of chemical reactions and the factors that influence their rates.
Test: Enthalpy Change & Activation Energy - Question 2
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Which type of reaction is characterized by a release of heat to the surroundings, resulting in a negative value for the enthalpy change (\( \Delta H \))?

Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 2
Exothermic reactions are those that release heat energy to the surroundings, leading to a decrease in enthalpy (\( \Delta H \)) and resulting in a negative value. This type of reaction is often associated with processes like combustion, where heat is given off as a product of the reaction. Understanding exothermic reactions is essential in various fields, including energy production and chemical synthesis.
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Test: Enthalpy Change & Activation Energy - Question 3
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In a chemical reaction, what factor influences the likelihood of successful collisions between reacting particles?

Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 3
Temperature plays a significant role in influencing the likelihood of successful collisions between reacting particles. As temperature increases, the kinetic energy of particles also increases, leading to more frequent and energetic collisions. This heightened collision frequency enhances the chances of particles overcoming the activation energy barrier and initiating a reaction. Understanding the relationship between temperature and reaction rates is fundamental in studying chemical kinetics.
Test: Enthalpy Change & Activation Energy - Question 4
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How do reactions with higher activation energies compare to those with lower activation energies in terms of the initial energy input required?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 4
Reactions with higher activation energies require more initial energy input compared to those with lower activation energies. This additional energy is necessary to overcome the energy barrier represented by the activation energy and initiate the reaction. Understanding the concept of activation energy is crucial in predicting and analyzing reaction rates and designing strategies to control and optimize chemical processes.
Test: Enthalpy Change & Activation Energy - Question 5
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In an exothermic reaction, which of the following statements is true?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 5
In an exothermic reaction, energy is released during bond formation, which exceeds the energy absorbed during bond breaking. This results in a negative ΔH value for exothermic reactions. It is a fundamental concept to understand that exothermic reactions release more energy than they absorb, leading to a net release of energy during the reaction process.
Test: Enthalpy Change & Activation Energy - Question 6
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Which type of reaction is characterized by absorbing more energy to break bonds than is released to form new bonds?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 6
Endothermic reactions are characterized by absorbing more energy to break bonds than is released to form new bonds. This results in a positive ΔH value for endothermic reactions. Understanding the distinction between endothermic and exothermic reactions is crucial in chemistry as it provides insights into the energy changes associated with different chemical processes.
Test: Enthalpy Change & Activation Energy - Question 7
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Which statement accurately describes endothermic reactions in terms of energy changes?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 7
Endothermic reactions are characterized by absorbing more energy to break bonds than is released to form new bonds. This results in a positive ΔH value for endothermic reactions. Understanding the energy dynamics of endothermic reactions is crucial in comprehending how energy is absorbed and utilized in chemical transformations.
Test: Enthalpy Change & Activation Energy - Question 8
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In endothermic reactions, if more energy is required to break bonds than is released during bond formation, how is the reaction classified overall?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 8
In endothermic reactions, the reaction is classified as endothermic overall when more energy is required to break bonds than is released during bond formation. This results in a positive change in enthalpy (∆H), indicating that the products possess higher energy levels than the reactants. Endothermic reactions absorb heat from the surroundings to proceed, leading to a decrease in temperature in their immediate environment.
Test: Enthalpy Change & Activation Energy - Question 9
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What is a key feature of exothermic reactions regarding the energy change?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 9
In exothermic reactions, the energy released during the formation of new bonds exceeds the energy needed to break bonds in the reactants. This leads to a negative ΔH value for exothermic reactions. Understanding this energy transfer is essential in grasping the thermodynamics of chemical reactions and their associated energy changes.
Test: Enthalpy Change & Activation Energy - Question 10
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What term is used to describe the energy required to initiate an endothermic reaction?
Detailed Solution for Test: Enthalpy Change & Activation Energy - Question 10
The energy required to initiate an endothermic reaction is known as activation energy. Activation energy represents the minimum amount of energy that must be input into the system to start the chemical reaction. This energy barrier needs to be overcome for the reactants to transform into products in an endothermic process.
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