For all students learning O Levels Chemistry (and other equivalents), it is important that you understand the difference between the 3 types of formulae commonly used – namely Molecular Formula, Empirical Formula and Structural Formula.
Previously, we have discussed on this topic before. You can find them HERE.
Let’s define them now, for better understanding and application:
Molecular [...]Air or some like to call it Atmosphere is considered a ‘minor’ chapter in GCE O Levels Chemistry examination, so much so that many teachers do not emphasise on their existence, not to mention importance.
As described by my Sec 4 Chemistry students, many of their Chemistry School teachers:
Ask the students to read textbook on their [...]The following Mole Calculation question is not difficult but many O Levels Chemistry students tends to make mistake in exams, where time is not a luxury. When the same question was posed to my regular classes of Sec 3 and 4 O Levels and IP students, i realised that many fall into the trap also.
Let’s [...]In the previous post, we have discussed on a MCQ question on Electrolysis that requires students to:
1. Write out discharge half equations
2. Do Molar Ratio Comparisons
Question:
Which of the following requires the least number of eletrons for discharge?
A. 2 mol of Al3+ (aluminium) ions
B. 5 mole of OH- (hydroxides) ions
C. 3 mol of O2- (oxides) ions
D. [...]In the previous post, we have discussed on 1 MCQ question on Electrolysis that requires basic Mole Calculations strategy to solve.
Do note that Electrolysis topic is only applicable to students taking:
GCE ”O” Level Pure Chemistry (Code: 5072)
Integrated Programme (IP) – it will be classified under Electrochemistry chapter
IB programme
IGCSE and other equivalents
It is NOT applicable to [...]
Mitch’s post showing the video of “the mark of the chemist” reminds me of one of the most visible remembrances I have of graduate school: the scar on one of my middle fingers (see left.) On a lovely Saturday in the lab (my music playing, no one else around), I dropped a Dewar flask from [...]
From: SMBC – Fear Itself ~Mitch
The Gulf oil tragedy has already shown the ignorance of some reporters about chemistry. However, a Mobile TV station and their chemist has taken it to new heights when they blamed the oil spill for (likely) bad glassware. WKRG is a local TV news station in Mobile, Alabama; they sent intrepid reporter Jessica Taloney to [...]
While cleaning out my newly assigned “war room” (the setting where I’ll strategize on how best to torture students this fall), I came across some fairly interesting documents that were buried in far corners of crowded file cabinets. They’re nothing personal or discriminating (sorry TMZ), but I saw them as material I could use in [...]