How much energy in a crisp?

This afternoon 8S were calculating the energy in various crisps. 

First weigh your crisp 

Add water to the boiling tube (known volume)

Take the temperature of the water

Burn the crisp under the tube of water

Measure the rise in temperature. 

Do the maths to find the calories then joules then joules per gram. 

The salt & vinegar sticks have the most energy per gram (but the worst taste according to this commentator)

Red cabbage anyone?

Continuing their work with acids an alkalis year seven have made red cabbage indicator. 

First they ground the cabbage with hot water and then filtered it to get rid the yucky (insoluble) bits. 

Then the indicator was tested with many household substances. 

All the results were recorded

Then a range of substances were chosen so that red cabbage indicator could be compared with universal indicator solution. 

Acid > neutral > alkali

Top = universal indicator

Bottom = red cabbage indicator

Year 6 meet the maggots

Testing to see if maggots prefer the dark or the light. 

How sensitive are they?

How fast do they wriggle?

The equipment 

Year 8 use slo-pro on the iPads to find the energy in a spring toy

Year Seven take the acid test

7N test a variety of substances to see if they are acids or alkalis