Paper 3: Required practical 3 - Effect of temperature on rate of a reaction
No description yet. This curated deck is ready for daily study.
Card preview (5)
How can rate of reaction be measured?
• Initial rates method - iodine clock • Continuous monitoring method - measuring the volume of gas released in a reaction over time
What are some issues with the disappearing cross experiment?
• It is judged by eye and so can’t be reliable • May be a delayed reaction time with the stopwatch • Slow reaction at low temperatures • May not be enough precipitation for the cross to disappear
How could you analyse the data?
• For a graph of amount of precipitate against time, it would be a straight line • Gradient - rate of reaction • Compare rate for each temperature
What are the control variables?
• Concentrations of reactants and products • Volumes of reactants and products • Use the same beaker and cross underneath • Use the same person to decide when the cross has disappeared
How can we keep a substance at a constant temperature?
Using a water bath