Moles and things

I never understand why it takes such a long time to introduce moles. The students seem to find it hard because many other alternatives are used to almost explain moles away, do why do we have to use grams per cubic litre?

Centripetal Force

Centripetal Force depends on the speed at which the object is rotated - its angular speed and the length of the string ( its radius) and its mass of course.

 

New Locktronics

To try and make practicals quicker and easier and more informative locktronics by @MatrixTSL seem to be the answer. I used them as a student many years ago and these things have well stood the test of time and are still great for my students.

IR Spectrometry

 Investigating what bonds are. Looking at IR spectrometry to see just what is going on, inside organic molecules. Practical work with these machines is essential A level learning.

Using a lightbox

 Sometimes old school systems work well. We had some graphs to compare but they weren't on the computer, but were on graph paper. Using the old fashioned light box one shone through the other making the comparison simple.

Comparing the properties of oil fractions

 I have done this experiment many times and each time with this source of synthetic crude oil the first fraction burns and so does the second, but not the third of the fourth but the fifth and sixth do

How does the eye Focus

 A quick look at the Pasco Model Demo Eye