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AQA Chemistry Rates of Reaction

  • Game Code: 1092045
  •  English    24     Public
    Revision game on Module 6 - The Rate and Extent of Chemical Change
  •   Study   Slideshow
  • What two things must happen for particles to react?
    They must collide and with enough energy for the collision to be successful
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  • What is the name given to the energy that particles must have for a collision to be successful?
    Activation energy
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  • What is activation energy?
    The amount of energy needed to start a reaction
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  • What are the two ways to calculate the rate of a reaction?
    quantity of reactant used divided by time or quantity of product formed divided by time 
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  • What are the two methods for measuring the volume of gas produced in a reaction?
    Gas syringe or measuring cylinder filled with water
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  • Give an example of the units for a rate of reaction?
    g/s or cm3/s
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  • Which line, A or B, shows the fastest reaction? Explain your choice.
    A because the line starts steeper or there is more gas produced in a shorter time
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  • What does it show when the line of the graphs has levelled off (gone flat)?
    That the reaction has stopped
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  • Which reaction, A or B, finishes first? How can you tell?
    A because the line levels off in the shortest amount of time
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  • For both reactions, A and B, the rate of reaction slows down as time progresses. Why does this happen?
    The reactants are being used up in the collisions, so their concentration decreases. This means less frequent collisions until one reactant is used up
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  • What are the 5 factors that effect the rate of a reaction?
    Concentration, temperature, pressure, surface area and catalysts
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  • Explain how a catalyst changes the rate of a reaction
    It speeds up the reaction by lowering the activation energy, meaning there are more successful collisions
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  • Explain how increasing the concentration of a reactant will change the rate of the reaction
    There are more particles per unit volume, so more frequent collisions and a faster rate of reaction
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  • Explain how decreasing the temperature of a reaction changes the rate of a reaction
    The particles will have less energy, so there are less successful collisions and a slower rate of reaction
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  • How can we increase the surface area of a solid?
    Grind it up into a powder/cut it into smaller pieces
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  • Use the green tangent line to calculate the rate of this reaction
    60/5 = 12 cm3/s
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