Chemistry Reaction Rates Quiz
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Questions and Answers

Which of the following factors can affect the speed of a chemical reaction?

  • Particle size
  • Concentration
  • Temperature
  • All of the above (correct)

    • Enzymes are inorganic catalysts.

    False

    What is a catalyst?

    A substance that increases the speed of a chemical reaction without being consumed in the process.

    The total volume of gas produced in a reaction will ___________ as the reaction proceeds.

    <p>increase</p> Signup and view all the answers

    Match the following methods of measuring reaction speed with their corresponding descriptions:

    <p>Measure the amount of product formed = Determine how much gas is produced over time Measure the amount of reactant used = Determine how much material is consumed over time Measure changes in mass = Observe the mass of the reaction mixture over time</p> Signup and view all the answers

    What does the gradient of a volume of gas evolved against time graph indicate?

    <p>The speed of the reaction</p> Signup and view all the answers

    The speed of reaction remains constant throughout the entire process.

    <p>False</p> Signup and view all the answers

    At what time does the gradient of the mass against time graph become zero?

    <p>5 min</p> Signup and view all the answers

    The speed of reaction decreases as the reactants are _________.

    <p>used up</p> Signup and view all the answers

    Match the following statements regarding the reaction's progress:

    <p>The gradient is steepest = The speed of the reaction is fastest The gradient decreases = Reactants being consumed The gradient becomes 0 = No more gas is being produced The reaction has stopped = Speed of reaction = 0</p> Signup and view all the answers

    What happens to the amount of gas produced over time during the reaction?

    <p>It increases, then levels off</p> Signup and view all the answers

    The apparatus can measure both volume of gas evolved and mass of the reaction mixture.

    <p>True</p> Signup and view all the answers

    What does a horizontal line on the volume of gas evolved against time graph represent?

    <p>The reaction has stopped producing gas.</p> Signup and view all the answers

    Which of the following factors does NOT affect the speed of a chemical reaction?

    <p>Color of the reactants</p> Signup and view all the answers

    The more reactant particles collide, the slower the reaction will be.

    <p>False</p> Signup and view all the answers

    What is the term used to describe the minimum energy required for a reaction to occur?

    <p>activation energy</p> Signup and view all the answers

    The total volume of gas evolved during the reaction was _____ cm3.

    <p>70</p> Signup and view all the answers

    Match the following factors with their effects on the speed of a reaction:

    <p>Increase in concentration = Increases effective collisions Increase in temperature = Increases particle energy Presence of a catalyst = Lowers activation energy Increase in pressure = Increases gas particle frequency</p> Signup and view all the answers

    What is the expected outcome of increasing the temperature of reactants?

    <p>Increased frequency of collisions</p> Signup and view all the answers

    Why is a catalyst used in chemical reactions?

    <p>To lower the activation energy.</p> Signup and view all the answers

    A fast reaction will always produce a larger volume of gas compared to a slow reaction under the same conditions.

    <p>False</p> Signup and view all the answers

    Which factor contributes to an increased speed of reaction due to a larger surface area?

    <p>Size of reacting particles</p> Signup and view all the answers

    Increasing the pressure of a gas decreases the speed of a chemical reaction.

    <p>False</p> Signup and view all the answers

    What happens to the speed of reaction when the temperature increases?

    <p>The speed of reaction increases.</p> Signup and view all the answers

    The Haber process operates at high pressure of _____ atm.

    <p>250</p> Signup and view all the answers

    What is the main reason for the increase in reaction speed when particle size decreases?

    <p>More collisions occur</p> Signup and view all the answers

    Smaller reactant particles lead to a decrease in the frequency of effective collisions.

    <p>False</p> Signup and view all the answers

    Name one factor that increases the speed of a chemical reaction.

    <p>Temperature, pressure, or concentration.</p> Signup and view all the answers

    What is the primary function of a catalyst in a chemical reaction?

    <p>To increase the reaction speed without being consumed</p> Signup and view all the answers

    Enzymes can function effectively only within a wide range of pH levels.

    <p>False</p> Signup and view all the answers

    What term is used for substances that prevent catalysts from functioning effectively?

    <p>poisons</p> Signup and view all the answers

    A catalyst provides an alternative pathway with a lower _________ energy for the reaction to proceed.

    <p>activation</p> Signup and view all the answers

    Match the following characteristics with the correct statements:

    <p>Catalysts = Remain unchanged after the reaction Enzymes = Proteins that act as biological catalysts Catalysts are selective = Different reactions require different catalysts Enzymes are sensitive = Affected by temperature and pH changes</p> Signup and view all the answers

    What effect does an enzyme have on a reaction?

    <p>Decreases the activation energy</p> Signup and view all the answers

    All catalysts are transition metals or their compounds.

    <p>False</p> Signup and view all the answers

    Enzymes generally double the rate of reaction for every _______ degree Celsius increase in temperature until denaturation occurs.

    <p>10</p> Signup and view all the answers

    Study Notes

    Speed of Reaction

    • Reactions proceed at different rates, ranging from very fast (explosions) to very slow (rusting).
    • Methods to measure reaction rate include measuring product formation, reactant consumption, or changes during the reaction over time.

    Measuring Reaction Rate

    • Reaction rate can be measured by monitoring the volume of gas produced (e.g., using a gas syringe) or the mass loss (e.g., using a balance) over time.
    • Data collected can be plotted as graphs (volume/mass vs. time)
    • The gradient of the graph represents the reaction rate (steeper gradient = faster reaction).

    Factors Affecting Reaction Rates

    • Particle Size: Smaller particles have a larger surface area, leading to more frequent collisions and faster reactions.
    • Concentration: Higher concentration means more particles per unit volume, increasing collision frequency and reaction rate.
    • Temperature: Higher temperatures provide particles with more kinetic energy, leading to more frequent and energetic collisions. Increasing temperature generally doubles reaction rate with every 10°C increase.
    • Pressure: Increasing pressure for gaseous reactants increases the concentration, increasing the frequency of collisions.
    • Catalysts: Catalysts speed up reactions by providing an alternative reaction pathway with lower activation energy. Catalysts are unchanged after the reaction.
    • Enzymes: Enzymes are biological catalysts that work by lowering activation energy, speeding up biochemical reactions. Their activity is affected by temperature and pH.

    Collision Theory

    • Reactions only occur when reacting particles collide with sufficient energy (activation energy).
    • The more collisions per unit time and the more energetic the collisions, the faster the reaction.
    • Collision theory explains how factors such as concentration, temperature, and particle size affect reaction rates.

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    Speed of Reaction PDF - Past Paper

    Description

    Test your knowledge on the factors affecting reaction rates and methods for measuring them. This quiz covers concepts such as particle size, concentration, temperature, and data analysis through graphs. Prepare to deepen your understanding of chemical kinetics!

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