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    May 2020
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  1. Hi I need help in choosing another chem IA. This is because my last chem IA idea did not work (How does changing the concentration of water using sodium chloride affect the enthalpy change of hydration copper (II) sulfate?). This is a shame as I feel that the way I wrote this chem IA was really good. Here are some ideas that I have come up with/found and I was wondering which ones are suitable to get me a high 6/7. Use different acids to see which is most effective at catalyzing the esterification of propanoic acid Effect of temperature on enzyme activity. Monitor the rate at which amylase breaks down starch into maltose at various temperatures to find the optimum for the enzyme and with that, the activation energy of the chemical reaction. • An expansion of the determination of manganese in a paper clip. • Extraction of oil from spices (using different sources of spices, different storage conditions) • The amount of nitrogen in fertilizers (reacting with excess NaOH and titrating with standard HCl) • The effect of temperature on vitamin C content in red pepper juice. • The effect of temperature on the pH of ascorbic acid solutions
  2. Hi Thank you for responding. Could you clarify on applications? So far I will be comparing two spinning tops (making their volumes and height the same) and using calculus, showing how they have different moment of inertias due to their different axis of rotations.
  3. Hi, I am looking to do my maths IA on spinning tops and analyzing which one is superior in terms of their moment of inertias? Is this a good maths IA for higher level?
  4. Hi, My HL maths IA is basically on spinning tops. It concerns how the change in its radius with respect to height of the z axis changes. In that, I show how one spinning top has a higher moment of inertia than the other? Is this a good math IA? Does it have the right amount of maths? I am aiming for a grade 6/7 and need help. Also How would I go about keeping the volume constant for the two spinning tops? Would I find the volumes of each spinning top separately and then find a scale factor? How would that work? Sorry for so many questions. But I need help. Also any other proposals around the topic of moment of inertia would be helpful. I do not mind changing topics but would rather keep it similar to inertia.
  5. Hi, My teacher and I came up with a question which we thought was suitable. I was wondering whether this could get me a level 7. Using Hess’s Law – Measure the enthalpy changes for the dissolving an anhydrous and hydrated salt (such as copper sulfate or cobalt chloride) in order to work out the enthalpy for the hydration process. My independent Variable: Oxidation states of metals. i.e copper (I) sulphate, Copper (II) sulphate cobalt (I) chloride and cobalt (II) chloride (the roman numeral indicates the oxidation state of the metal. Varying the mass of each oxidation state of metal in hydrated salt. My dependent variable: The enthalpy change of hydration. However, I am aware that the independent variable is a bit dodgy as its not really effective quantitative data. Are there any other suggestions? I thought changing the moles of the metals, but that would also mean that the change in mole would occur for the product side as well, balancing out the change in enthalpy. Am I correct or not?
  6. Hi, My investigation question so far is "To what extent did the Spanish colonies in South America improve the Spanish economy?" or as my teacher recommended, "To what extent was the Spanish colonies in South America the main factor that affected the Spanish economy between 1492-1650?." Either way, I am stuck as to where to research sources, let alone what I should focus on. Should I focus on just the spanish colonies and analyse two sources with opposing perspectives?
  7. Enterbot3

    IB Physics IA

    How does changing the vertical height of which a yoyo is let go affects the velocity is reaches at the bottom? Is this a good question?
  8. How does changing the vertical height of which a yoyo is let go affects the velocity is reaches at the bottom? Is this a good question?
  9. Hi For my chemistry IA, I am looking towards investigating the Nernst equation but I am not sure what to investigate. Are there any ideas?
  10. I was wondering if visible light can cause photoelectric effect although it contains less energy than UV
  11. Hi, I need advice in minimising error in calculating the area of the holes present in a spouting cylinder. If I take into account the error, it reaches 20%, which is really high. Should I just ignore this since it should not effect the overall result. But then again, to find the velocity of the fluid, I am dividing the volumetric flow rate by the area of the hole, so what should i do?
  12. Hi. Thanks for the reply. Is there any other way to minimise the large errors or should I have two graphs, (one which contains the errors/and the other that does not), to show the significance of this error? Also would 5 holes be enough? I plan on making 25 trials for each hole to make it as accurate as possible. Finally, to measure the flow rate, would I measure how much volume is lost in a given amount of time, by using a separate beaker to collect the fluid out (quite difficult as water can spill) or should I measure how much water has been lost through the spouting cylinder? This is the part I am unsure of.
  13. Hi, I would like to investigate the effect of changing the height on the velocity of the fluid coming out of the cylinder but need help. My school has a spouting cylinder with 4 holes (not enough data?) and I am confused as to how I should find the velocity. My teacher said I should calculate the velocity via projectile motion but wouldn't it be better to find the flow rate per 10 seconds and then from there find the velocity by multiplying the flow rate by the area of a cylinder? Overall, I am attempting to prove Toricelli's law by showing that the velocity of the fluid coming out at different heights is the same as the velocity when a drop of water is dropped from that certain height? How can I do this? I really want to get high marks in this physics IA. Can anyone please give me advice?
  14. Hi, How would you integrate via substitution the following 6/4x^2+1
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