Thursday, April 1, 2010

flash, bang, wow attention grabbers

Ask someone what they remember from their science lessons at school and more than likely they'll recall the time that the tiniest lump of sodium whizzed around in a trough of water or the loud bang of a hydrogen & oxygen balloon exploding or the fantastic effect of dry ice placed in a large beaker of water with a couple of squirts of universal indicator, and if they are the mischevious type (hey wasn't that all of us as teenagers!) using the bunsen flame to melt the top of their biros when their teacher wasn't looking!
 Students learn when they are involved, engaged and in a safe environment with positive learning experiences.
"Tell me and I'll forget
Show me and I may remember
Involve me and I'll understand"
Chinese Proverb


Health and Safety in most countries have clamped down on safety in school laboratories, as a result we are really limited with what "out of the ordinary but relevant" experiments that we can do in the classroom.  See below some of my favourite flash, bang, wow attention grabbers.

I'd suggest letting your students carry out the experiments that are legal in your workplace, demo others if more appropriate while getting your students to video them using their mobile phones or laptops.  Students can then describe and explain the science concepts behind the experiments by adding text to images using Macromedia Fireworks, editing the videos in Microsoft Movie Maker and adding audio using Audacity or perhaps using Microsoft Powerpoint to type text alongside images or video clips.  I will post up another day with numerous recommended Science and Chemistry videos and interactive activities.
But first the disclaimer...I take absolutely no responsibility nor liability for death or injury that results to a person or persons who demonstrate or observe any of the reactions below or elsewhere on my blog pages.  You must consult the Health and Safety guidelines for your own workplace and country and carry out your own risk assessment before attempting any of the experiments.

Never, ever risk your students safety.


to view a full screen image of the video
rightclick, watch on Youtube
click on the name to download a detailed teacher information sheet
here is a brief description and link for the demonstration/experiment
Whoosh bottle

A fast, furious reaction


links to: combusion, organic
Firewriting

Very easy to do, good for all ages


links to: combustion, redox
Fake blood

A wonderful, dramatic effect


links to: redox, respiratory system
Supercooling water
Do, definitely try this at home


links to: states of matter, heat changes
Ammonia fountain
Produces a little pink fountain


links to: acids & bases
Errie green glow
be sure the lights are out, a lovely green glow is produced.


links to: combustion, organic
Howling jelly baby
highly dangerous reaction, should only be carried out by a qualified Chemist. 


links to: redox, sound

The copper cycle What a neat little experiment, really fab!


links to: redox, precipitation, neutralisation, thermal decomposition
Thermite reaction highly dangerous exothermic reaction, should only be carried out by a qualified Chemist

links to: redox, reactivity series


colourful glass beads are produced


links to: transition metals

Rainbow tornado
rainbow colours with a tornado effect will certainly hold your students attention

links to: acids & bases
Balancing trick
Persevere with this one, it's worth it, also a great party trick. 

links to: forces, moments
Hot air balloon This works brilliantly, launch well away from main roads.


links: convection
Elephants toothpaste certainly has the wow factor! you could also use MnO2 as the catalyst

links to: states of matter, rates of reactions
Cannon fire
little snap, crackle and pops will go off 


links to: redox
Paper kettle
a fab experiment, boil water in your paper kettle with a bunsen, students won't believe that the paper doesn't go on fire!

links to: convection

turn the lights off and watch this illuminous blue glow, mesmerising!


links to: rate of reaction

Turning copper into gold
Act as an alchemist as you turn copper to silver (zinc coating) and then gold (brass)


links to: redox, periodic table
Coke fountain
stand well back, this is loads of fun, another one to try at home



links to: forces
The wine party
this demonstrates more redox reactions 

links to: redox

Burning money a good attention grabber at the beginning of a topic

links to: combustion, organic
Slime this is a fun experiment that can extend into an investigation as students carry out tests on their slime


links to: organic, investigating

Volcano reaction highly dangerous redox reaction, should only be carried out by a qualified Chemist.

links to: redox, geology
Oscillating Briggs-Rauscher reaction
students observe not just 1 colour change but ongoing colour changes for a few minutes

links to: observations, rate of reactions
Matchstick rocket

another one to try at home, once perfected this works well


links to: forces
Rainbow flames
another good lesson starter


links to: flames tests, observations
Extremely cold reaction
amaze your students as you lift some wood with some cold water


links to: endothermic reactions


another projectile launcher to try at home

links to: forces

Black snake
this is a good into to carbon chemistry


links to: elements & compounds, organic
Polymer ball a good activity at the end of a few lessons on polymers


links: organic
Ferrofluid You absolutely must purchase this fluid online, has to be seen to be believed


links to: elements, magnetism

For additional recommended reading see the following resources
Chris Schrempp, "Bangs, flashes and explosions" demonstration manual and dvd's
RSC (Royal Society of Chemistry), "Surely that's banned", 2005
CLEAPSS School Science Service, "We don't do that. it's not safe anymore" 2004
 Journal of Chemical Education, Chemistry comes alive

So without so much as a sizzle, pop or a bang I'm out of here for two weeks holidays in the sun and surf.  Happy Easter everyone! 

Smiley

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