Energetics Thermochemistry
Energetics Thermochemistry Energetics is such a broad topic students sometimes have difficulty understanding what the question is asking for. This post aims to help build a mental shortcut for students to "funnel" the question into broad question types. Thereafter to quickly apply the thought process for solving it. In the picture below, you see the four broad question structures on the left. On the right side is the approach to solve certain types of questions. Additionally, there are also acronyms to help students remember the sequence of answer, e.g. F.A.I.L for Born Haber Cycles and BE.R.P. for bond energy. Energy cycles can only be done well if you have a good grasp of the common definitions of different enthalpy change ...
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/ / Teaching and learning
Cells of recognition
Cells of Recognition All of us have brain cells that helps us make sense of our environment. From the second we blink-open our eyes when we wake. These cells of recognition have been built way back when we were infants. Day by day, week by week, month by month and year by year. We are able to go through the day, sometimes without thinking much about what we're doing because of them. Some experts call this habit. But before we can form a habit, we do need to think about what we're doing. Only once we have made sense of the action, then we do it repeatedly WITHOUT thinking about it. Why am i talking about this? Because i believe ...
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/ / Teaching and learning
Chemical Equilibrium Summary Table
Chemical Equilibrium Summary Table The qualitative aspect of Chemical Equilibrium can be summarized into the table below. From the table, we can see that changes in concentration, pressure and catalyst does not affect Kc/Kp. The only factor that does affect equilibrium constants is temperature. Also, we would need to know whether the forward reaction is endo or exothermic to predict the effect temperature change will have on it. Note that increasing temperature increases both the rate of forward and backward reactions. However, the rate of the endothermic reaction will be increased more than the rate of the exothermic reaction. If the enthalpy change for the reaction is zero, temperature will have no effect on the equilibrium. Similarly, if the reaction ...
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/ / A level syllabus
Relationship between Kc and Kp – Chemical Equilibrium
Relationship between Kc and Kp - Chemical Equilibrium I was updating the chemical equilibrium notes this week and thought it would be good to share this with all of you. Didn't know how Kc and Kp was related and i was stumped by a question about 10 years ago when i was still teaching in a JC. The main idea is to use the ideal gas equation to substitute partial pressures in concentration terms. Once you got it, it's quite easy to remember 🙂 Hope you've found this useful, if it was, do share it with your friends via the social media buttons below. Back to Best Chemistry Tuition in Singapore ...
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/ / A level syllabus
Comparison between Galvanic and Electrolytic Cell
Comparison between galvanic and electrolytic cell table Students tend to get mixed up between the two types of electrochemical cells. This table will illustrate the comparison between galvanic and electrolytic cell. A useful acronym, P.A.N.I.C. for electrolytic cell polarity (Positive is Anode Negative is Cathode). Then just remember polarity is reversed for galvanic cell. If you found this useful, share it with your friends! Back to Home of Best H2 Chemistry Tuition ...
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Physical Chemistry Calculations – Be Aware Where Errors Occur
Physical Chemistry Calculations Physical Chemistry - Recently i was revising acid-base equilibrium with one of my students and i realised she has trouble getting the right answer even though the procedure is correct. We went through the process and every step was conceptually correct. Then i got her to show me how she calculated on her GC, i saw the workings and it was right. But when she pressed "=", the answer came out wrong! Boy, was i puzzled. We went through the steps carefully again and still we arrived at the same outcome. Finally, after i queried her on one of the steps, we both realised what's wrong. She did not use brackets to sequence the operations, thus the ...
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/ / Tips
Chemistry Tuition by Mr Eric Kua
Chemistry Tuition by Mr Khemistry Looking for a good, reliable Chemistry Tuition? We understand there are many centers that offers Chemistry Tuition nowadays and it's difficult to tell which ones are worth your time. Here we compile a list of reasons why Mr Khemistry is the Chemistry Tuition you are looking for. We are Qualified. Our Principal Tutor, Mr Eric Kua, graduated from NUS with a Degree majoring in Chemistry. He has taught in a JC for more than 8 years. For his full academic and teaching qualifications, click here. We are Experienced. All our tutors have over 10 years of experience tutoring students in Chemistry, Mr Eric Kua has more than 13 years of experience in Chemistry tuition. We ...
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Born Haber Level Diagram
Born Haber Level Diagram Born Haber Level Diagram Always start your cycle at datum line, i.e. at zero enthalpy. Tip: You may combine the ionisation energies for Fe or for other metals. Multiple electron affinities can also be combined. Take note that for energy level diagram, you will have to show the ionized electrons from Fe. When you use bond energy instead of enthalpy of atomisation, you will need to multiply by the correct coefficient. Lastly, don't forget to put your state symbols! 🙂 Hope this has been useful for you, if you wish to learn how to draw the diagram using energy cycle, go here. Back to Home of Leading A level Chemistry Tuition ...
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