how far how fast

• how can rate be found of a graph?


  drawing a tangent
• rate equation?


  rate= k[a]^2[b]
• what is an order of reaction?


  the power to which a concentration is raised to in the rate equation
• what is a first order conc time graph ?


  straight line with constant gradient
• first order conc time graph?


  downwards slope with a constant half life
• second order conc time graph?


  most sloped and levels out quick
• zero order rate conc graph?


  straight line horizontal
• first order rate conc graph?


  straight line where gradient=rate constant
• second order rate conc graph?


  sloping upwards curve
• what is a half life?


  time taken for the concentration of a reactant to drop to half its original value
• how to calculate rate constant for first order?


  k=0.693/t0.5
• homogenous equilibria?

  all species are in the same phase
• heterogeneous equilibria?

  Multiple phases coexisting at equilibrium.
• kc only includes?

  gases and aqueous solutions
• mole fraction equation?

  number of moles of gas A/ number of moles of all gases
• partial pressure equation?

  mole fraction times total pressure
• how does temperature effect kp?

  exothermic = decrease kp

  endothermic = increase kp
• Who is the presenter of the video on OCR-A module 5?

  Chris Harris
• What is the main focus of the video?

  Revision notes for OCR-A module 5
• Why is it important to practice questions in addition to knowing content?

  To effectively use the content learned
• Where can the slides mentioned in the video be purchased?

  In the comments box below
• What is the benefit of using the slides on a mobile device?

  Access them anytime for note-taking
• What is the purpose of the colorimeter in measuring reaction rates?

  To measure light absorptivity in colored samples
• How can pH be used to measure the progress of a reaction?

  By monitoring changes in H+ ion concentration
• What is a method to measure gas production in a reaction?

  Using a gas syringe to collect gas volume
• What is the ideal gas equation used for in this context?

  To calculate the number of moles of gas produced
• What color change indicates the progress of the reaction between propanone and iodine?

  From brown to colorless
• What does a calibration curve allow us to do?

  Measure unknown concentrations against known values
• How do you determine the absorbance of an unknown sample?

  Measure its absorbance and compare to the curve
• What is the significance of drawing a line of best fit on a graph?

  To represent the overall trend of the data
• How is the gradient of a graph calculated?

  Change in Y over change in X
• What units are used for the gradient in a reaction measuring volume of gas?

  Centimeters cubed per minute
• What is the method for finding the gradient of a tangent on a curve?

  Draw a tangent and calculate change in Y over X
• What does the initial rate of a reaction refer to?

  The rate at the very start of the reaction
• Why is it important to use a large section of the graph for calculating the gradient?

  To reduce errors and improve accuracy
• How can you calculate the initial rate from a graph?

  Using the gradient of the tangent at zero minutes
• What challenges arise when calculating the gradient of a curved graph?

  The rate of reaction changes along the curve
• What is the significance of the units in a reaction rate graph?

  They indicate the relationship between variables
• What is the significance of the video being tailored to the OCR-A exam board?

  It contains relevant information for that board
• Why is monitoring the rate of reaction at regular intervals important?

  To accurately assess the progress of the reaction