UTC: Tuesday, January 17th, 2017

Online AP Chemistry Review Courses 2017

In the Spring of 2017 I will be offering the inaugural, Online AP Chemistry Review Courses for AP Chemistry STUDENTS. For many years I have offered the very popular Online AP Chemistry Summer Workshops for teachers, and now it’s time to boost AP scores from a student point of view. I will offer two, independent, six […]

All creatures great and small and 2016, 6

All things bright & beautiful, all creatures great and small. Remember that hymn? We often talk about remembering the little things, well here’s a lesson in remembering the big things as well! This post started life with an entirely different title. It was initially called, Should I ignore ‘-x’ in my ICE table? I started writing […]

Writing good answers to AP Acid-Base problems

Here’s the latest in the ‘writing good answers’ series, Writing good answers to AP Acid-Base problems. It’s probably the toughest topic on the exam for students, or at least it seems to be, so here are a few pointers that might help when answering questions on acid and bases on the AP chemistry exam. 1. […]

Another ∆G° mystery

We’ve lived through the nonsense of the inclusion of PES in the new AP Chemistry curriculum. Many think the exclusion of quantum numbers, stinks. Some people HATE the removal of colligative properties from the course. For me, these (and other things) provoke varying degrees of outrage that range from complete indifference to utter incredulity. Then […]

Writing good answers to AP Equilibrium problems

Here’s the latest in the ‘writing good answers’ series, Writing good answers to AP Equilibrium problems. This post only deals with aspects of equilibria such as Kc, Kp, Ksp and Le Châtelier’s Principle – I’ll deal with Acid-Base equilibria in a separate post. So, here’s a list of some pointers to make your AP equilibrium […]

Le Châtelier’s principle in action

Following the mention of the cobalt(II) complex ion system in this post from a couple of days ago, here’s a 30 second video clip of Le Châtelier’s principle in action in the same (with The Smiths). The equilibrium that is set up is this, [Co(H2O)6]2+(aq) + 4Cl–(aq) ⇌ [CoCl4]2-(aq) + 6H2O(l) and the aqueous solution […]

Water in equilibrium mixtures and Le Châtelier’s principle

When it comes to water in equilibrium mixtures and Le Châtelier’s principle, things can be confusing, so let’s try to take some of the mystery out of this. When reading EK6B1a in the AP Chemistry CED, one finds this; The highlighted text is what I care about here. Where water is important I think that […]

∆G and ∆G° revisited

∆G and ∆G° can be tricky things. This is partly evidenced by a post that I wrote back in January of 2012 continuing to be one of the most popular of all time on the blog. I wrote that post four years ago in an attempt to clear my own mind about the differences between […]

More, potentially useless Wordles

I recently re-visited the Wordles that I first produced in June of 2013 for the original versions of my AP Chemistry notes for Big Ideas 1-6. You can read about them here. Before I update those Wordles again to reflect the newer versions of the notes more than 2 years down the road (which I […]

pH and significant figures

In a quick addition to this post and this post, here’s a note about pH and significant figures. Firstly the ‘rule’. When taking the log of a number that is expressed in scientific notation (as hydrogen (hydronium) ion and hydroxide ion concentration often will be), the number of significant figures in the mantissa of the […]