rates of reaction and energy changes

    Cards (25)

    • What is one way to follow a reaction?
      By looking at the loss of mass
    • What happens to mass when a gas is produced in a reaction?
      The mass will decrease
    • How can gas be collected during a reaction?
      Using a syringe or inverted measuring cylinder
    • What are the units for measuring the rate of reaction when using volume and time?
      Centimeters cubed per minute
    • What is the second unit for measuring the rate of reaction?
      Grams per second
    • How do you find the rate of reaction at a specific point on a graph?
      By drawing a tangent at that point
    • What does a steep tangent indicate about the rate of reaction?
      It indicates a fast rate of reaction
    • What color change indicates a reaction between sodium thiosulfate and hydrochloric acid?
      From clear colorless to opaque
    • What is a major health concern when conducting the sodium thiosulfate reaction?
      It can irritate your hands
    • Why should the same person measure the rate of reaction in the color change experiment?
      To avoid differences in perception
    • What is a potential error when collecting gas in a measuring cylinder?
      Gas already present in the cylinder
    • How does the rate of reaction change with powdered calcium carbonate compared to large marble chips?
      It reacts much faster with powdered form
    • How does temperature affect the rate of reaction?
      Higher temperature increases the rate
    • What happens to particles at higher temperatures during a reaction?
      They move faster and collide more often
    • How does surface area affect the rate of reaction?
      Larger surface area increases the rate
    • What is the effect of high pressure or concentration on the rate of reaction?
      It increases the rate of reaction
    • What is the role of a catalyst in a reaction?
      It lowers the activation energy
    • What is the difference between endothermic and exothermic reactions?
      Endothermic absorbs energy; exothermic releases energy
    • How does a catalyst affect the activation energy of a reaction?
      It lowers the activation energy required
    • What is the energy change in an endothermic reaction?
      Energy is taken in
    • What is the energy change in an exothermic reaction?
      Energy is given out
    • How do you calculate the energy change during a reaction?
      By considering bond energies of reactants and products
    • What is the balanced equation for burning hydrogen in oxygen?
      2H₂ + O₂ → 2H₂O
    • What is the significance of a negative energy change in a reaction?
      It indicates an exothermic reaction
    • What should you practice for the exam regarding calculations?
      Energy change calculations