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AQA Chemistry Rates of Reaction

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  • Grinding a effervescent tablet into powder increases the rate of reaction due to increased
    surface area
  • What is the relationship between concentration of acid to rate of reaction? Directly proportional. Inversely proportional.
    Directly proportional
  • What does it show when the line of the graphs has levelled off (gone flat)?
    That the reaction has stopped
  • 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
  • When did the reaction at lower concentration stop?
    40 seconds
  • What is the name of the piece of equipment labelled B?
    Conical flask
  • How can we increase the surface area of a solid?
    Grind it up into a powder/cut it into smaller pieces
  • What are the two methods for measuring the volume of gas produced in a reaction?
    Gas syringe or measuring cylinder filled with water
  • Which changes decrease the rate of reaction between magnesium and air? 1 heating the magnesium to a higher temperature. 2 using a higher proportion of oxygen in the air. 3 using magnesium ribbon instead of powdered magnesium.
    3 using magnesium ribbon instead of powdered magnesium
  • What is the relationship between temperature and kinetic energy of particles? Directly proportional. Inversely proportional.
    Directly proportional
  • The major theory of reaction rate is called
    Collision Theory
  • 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
  • Which reaction, A or B, finishes first? How can you tell?
    A because the line levels off in the shortest amount of time
  • What is the gas produced when a magnesium is placed in a dilute acid?
    Hydrogen gas
  • Which is the highest concentration? 10m 2M 25 mmol 0.5M
    2 M
  • What is the name of the piece of equipment labelled A?
    Gas syringe
  • Which line, A or B, shows the fastest reaction? Explain your choice.
    A because it has a steeper slope or there is more gas produced in a shorter time
  • 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
  • What is the relationship between surface area and the particle size? Directly proportional. Inversely proportional.
    Inversely proportional
  • What is the relationship between surface area to rate of reaction? Directly proportional. Inversely proportional.
    Directly proportional
  • Which of the following increase the reaction rate? less surface area. lower temperature. increased concentration
    increased concentration
  • What two things must happen for particles to react?
    They must collide and with enough energy for the collision to be successful
  • To slow down a chemical reaction you will do one of the following: Place the reactants in hot water. Place the products in ice bath. Place the reactants in a ice bath. Keep stirring the reactants with a stirring rod.
    Place the reactants in a ice bath
  • What is the rate of reaction?
    How fast a reaction is in a certain time
  • Mention 3 variables affecting  the rate of a reaction.
    Concentration, temperature,  surface area
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