Pressure inside a ballooon

 Is the pressure inside an inflated balloon greater than that in a deflated balloon? The debate raged on until with a @Pascoscientific wireless pressure sensor proved that the pressure was indeed 1.1 KPa higher in the inflated balloon - the elasticity of the balloon to blame.

Curves

 Now draw a nice smooth curve through all the points

Static Electricity to Direct Current Demo

 A good fun experiment taking the static electricity from a Wimshurst machine and passing this to a capacitor plate and using a graphite-covered ping pong ball to transfer the charges which can then be picked up on a beam galvanometer.

Biodiversity

Thank goodness some councils in England are seeing sense in biodiversity. The councils are starting to leave large areas of parks to go more native, and as a result, there is a burst of biodiversity coming along.

 

Barton’s pendulums

 Why do the pendulum’s the same length power each other but the ones that are different lengths don’t. Some homework to keep the students busy

Temperature and rates of reactions

Not so easy to do in an hour, to set up the solutions at the correct temperature and do all the experiments but we succeeded with time to space thanks to doing this with @pascoscientific colourimeter and Capstone Software.

 

Rates of Reaction

 Starting with the experiment and working out the individual rates of each reaction using the reaction of Sodium Thiosulfate and Hydrochloric acid in a @pascoscientific colourimeter, the students then plotted the rates against concentration and were pleased to get a relationship.

By pooling the class results, they got a set of error bars that showed the experiment could either be a curve 2nd order or a straight line first order.