CP4 Finding the Activation Energy of a Reaction

• Activation Energy is the minimum energy required to initiate a chemical reaction
• Activation energy represents the energy barrier that reactants must overcome for a reaction to proceed.
• What is the mathematical expression for the Arrhenius Equation?

  $k =$$Ae^{ - \frac{E_{a}}{RT}}$
• In the Arrhenius Equation, the frequency factor ($A$) reflects the number of collisions and orientation
• The ideal gas constant (R) in the Arrhenius Equation is 8.314 \, J \, mol^{ - 1} \, K^{ - 1}</latex>.
• Arrange the components in the experimental setup for rate determination in the correct order:

  1️⃣ Reactants

  2️⃣ Temperature control

  3️⃣ Concentration adjustment

  4️⃣ Stirring rate

  5️⃣ pH control
• Temperature in the experimental setup can be controlled using a water bath
• Volumetric flasks are used to prepare solutions of known concentration in the experimental setup.
• What is used to ensure uniform distribution of reactants in the experimental setup?

  Magnetic stirrer
• Reactants in the experimental setup must have precise amounts and concentrations
• Match the variable in the Arrhenius Equation with its meaning:

  $k$ ↔️ Rate of a reaction

  $A$ ↔️ Frequency and orientation of collisions

  $E_{a}$ ↔️ Activation energy

  $T$ ↔️ Absolute temperature in Kelvin
• The Arrhenius Equation demonstrates that as temperature increases, the reaction rate decreases.

  False
• What does the Arrhenius Equation relate the rate constant of a reaction to?

  Temperature and activation energy
• In the Arrhenius Equation, the symbol $k$ represents the rate constant.
• What does the frequency factor $A$ in the Arrhenius Equation reflect?


  Collision frequency and orientation
• Activation energy is measured in $J / mol$.
• The ideal gas constant $R$ has a value of 8.314 J \, mol^{ - 1} \, K^{ - 1}</latex>.
• What is the unit of absolute temperature in the Arrhenius Equation?

  Kelvin
• Steps to determine the rate of a reaction in an experimental setup

  1️⃣ Control reaction conditions

  2️⃣ Use specific equipment

  3️⃣ Measure reaction parameters
• What is the purpose of using precise amounts and concentrations of reactants in a reaction?

  Ensure purity and control
• Temperature is controlled in a reaction using a water bath or temperature-controlled environment.
• A magnetic stirrer ensures uniform distribution of reactants in the reaction mixture.
• What does a buffer solution or pH meter maintain in a reaction mixture?

  Desired pH level
• As temperature increases, the value of e^{ - \frac{E_{a}}{RT}}</latex> becomes less negative.
• The reaction rate always increases linearly with temperature.

  False
• Key steps in data collection and recording for reaction kinetics

  1️⃣ Identify and control variables

  2️⃣ Use precise instruments

  3️⃣ Record data systematically
• What type of data table is used to record measurements in reaction kinetics experiments?

  Well-structured data table
• Clear and organized data tables ensure reproducibility of experimental results.
• To calculate the rate constant $k$, you need the reaction rate and the rate equation.
• What is the minimum amount of energy needed to initiate a chemical reaction called?

  Activation energy
• Activation energy represents the energy barrier that reactants must overcome to form products.
• What is the mathematical expression that relates the rate constant of a reaction to its temperature and activation energy called?

  Arrhenius Equation
• In the Arrhenius Equation, the frequency factor $A$ reflects collision frequency and orientation.
• What does the rate constant ($k$) measure in a chemical reaction?


  Speed of the reaction
• The frequency factor ($A$) reflects the collision frequency and orientation
• What are the units of activation energy ($E_{a}$)?


  $J / mol$
• Higher activation energy ($E_{a}$) results in a faster reaction rate.


  False
• The Arrhenius Equation relates the rate constant to temperature and activation
• What is the mathematical expression of the Arrhenius Equation?

  $k =$$Ae^{ - \frac{E_{a}}{RT}}$
• As temperature increases, the rate constant ($k$) also increases.