Sunday, April 25, 2010

weird & wonderful wonders

Students love a good yarn!  There are many weird and wonderful holiday snapshots and stories that help our students to realise that there is so much more to science than the 4 walls of the lab that they go to a few times a week.  On the first day of a new term I usually ask if any student would like to volunteer a story from their holidays, where possible we link their story to science.


For me, experiencing the solar eclipse at approx 11:15am on 11th of August 1999 while perched on a clifftop at Land's End on the southwest coast of England was the most phenomenal natural wonder that I have ever experienced.  The excitement of the hundreds of people waiting patiently as they gripped nervously onto their overpriced mirrored lenses glued into a flimsy cardboard frame.  The concern at the increasing number of clouds in the grey, gloomy sky on what was a typical English summers day.  The metallic, reflective, calm sea growing darker as the moon started to block the sun's light.  The fast forward effect of only 15 minutes for darkness to fall from daylight.  The birds stopped singing, dogs stopped barking and the mood felt quite errie as silence descended over all of us.  The strange sensation of sitting in complete darkness for what seemed like an eternity but was only really a couple of minutes.  Once the golden rays from that soon to be orb in the sky started to shine through the clouds there was complete joy and excitement accompanied by loud cheers and clapping as we had all shared this magical, one in a lifetime experience of a total solar eclipse.

There are endless tales we can tell of geological areas, nature parks, theme parks that we have visited that all link back to science in the classroom eg. with links to geology, diversity, evolution, forces etc... It makes science so much more real and interesting for our students. 

I have lifted the following images and text from this website http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.  The images of these 7 different natural wonders speak for themselves.

Number 1: Sailing stones
"The mysterious moving stones of the packed-mud desert of Death Valley have been a center of scientific controversy for decades. Rocks weighing up to hundreds of pounds have been known to move up to hundreds of yards at a time. Some scientists have proposed that a combination of strong winds and surface ice account for these movements. However, this theory does not explain evidence of different rocks starting side by side and moving at different rates and in disparate directions. Moreover, the physics calculations do not fully support this theory as wind speeds of hundreds of miles per hour would be needed to move some of the stones."
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.
Number 2: Basalt columns
"When a thick lava flow cools it contracts vertically but cracks perpendicular to its directional flow with remarkable geometric regularity – in most cases forming a regular grid of remarkable hexagonal extrusions that almost appear to be made by man. One of the most famous such examples is the Giant’s Causeway on the coast of Ireland (shown above) though the largest and most widely recognized would be Devil’s Tower in Wyoming. Basalt also forms different but equally fascinating ways when eruptions are exposed to air or water."
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.
Number 3: Blue holes
 "Blue holes are giant and sudden drops in underwater elevation that get their name from the dark and foreboding blue tone they exhibit when viewed from above in relationship to surrounding waters. They can be hundreds of feet deep and while divers are able to explore some of them they are largely devoid of oxygen that would support sea life due to poor water circulation – leaving them eerily empty. Some blue holes, however, contain ancient fossil remains that have been discovered, preserved in their depths."
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.
 Number 4: Red tides
"Red tides are also known as algal blooms – sudden influxes of massive amounts of colored single-cell algae that can convert entire areas of an ocean or beach into a blood red color. While some of these can be relatively harmless, others can be harbingers of deadly toxins that cause the deaths of fish, birds and marine mammals. In some cases, even humans have been harmed by red tides though no human exposure are known to have been fatal. While they can be fatal, the constituent phytoplankton in ride tides are not harmful in small numbers."
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.
Number 5: Ice circles
"While many see these apparently perfect ice circles as worthy of conspiracy theorizing, scientists generally accept that they are formed by eddies in the water that spin a sizable piece of ice in a circular motion. As a result of this rotation, other pieces of ice and flotsam wear relatively evenly at the edges of the ice until it slowly forms into an essentially ideal circle. Ice circles have been seen with diameters of over 500 feet and can also at times be found in clusters and groups at different sizes as shown above."
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.
Number 6: Mammatus clouds
"True to their ominous appearance, mammatus clouds are often harbingers of a coming storm or other extreme weather system. Typically composed primarily of ice, they can extend for hundreds of miles in each direction and individual formations can remain visibly static for ten to fifteen minutes at a time. While they may appear foreboding they are merely the messengers – appearing around, before or even after severe weather."
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/.
Number 7: Fire Rainbows
"A circum-horizontal fire rainbow arc occurs at a rare confluence of right time and right place for the sun and certain clouds. Crystals within the clouds refract light into the various visible waves of the spectrum but only if they are arrayed correctly relative to the ground below. Due to the rarity with which all of these events happen in conjunction with one another, there are relatively few remarkable photos of this phenomena"
image & text from http://webecoist.com/2009/01/18/nature-phenomena-wonders-natural-world/. 
 Does anyone have any suggestions regarding unusual wonders of the natural world or must see places around the world?  I'd like to start planning my summer holidays and am need of some suggestions.  Thanks!

Monday, April 19, 2010

PD or PPD?

Who would have thought? Because of a volcanic eruption...in Iceland, there is a large scale grounding of airplanes in Europe and as a result many presenters aren't able to get themselves to schools around the world to deliver their allocated professional development (PD) sessions.

 Fig. 1 is an illustration of volcanic ash dispersion up to 20,000 ft, issued at
7 am on 18 April. Advisory charts are issued every six hours, for up to 18
hours ahead, by the Volcanic Ash Advisory Centre.
Met Office, UK.

However, in this day and age of e-learning that really isn't a huge problem.  Presenters can upload their documents and powerpoints to a filesharing site, upload relevant videos to Youtube, use Skype to present their presentation, liaise with their clientale via email, take part in discussions with teachers using forums set up on a moodle page, upload information on their presentation to their webpage or a Wikispaces, type their thoughts into a blog, the list goes on... 

Is it really all that easy?  Well, being social animals, presentations given in person interspersed with humorous anecdotes are by far the most preferable option but I feel that where necessary, given the advances in technology it is possible for PD to be delivered via the internet.
Should PD be a "one size fits all"? I suspect not, what interests a bushy tailed, rose tinted spectacle wearing NQT (newly qualified teacher) may be of no interest (or use!) to one who has taught for 20 years or so.  I am very fortunate to be working in a school whereby we can choose our own PD.  Options are usually offered for thinking skills, literacy, ICT, assessment, managerial skills....the list goes on.  Some teachers actually design their own Personal Professional Development (PPD) session and meet with a colleague(s) to work on something that is advantageous to their curriculum area, and no, I don't mean just catching up on marking.

See below some e-learning suggestions that you may find useful.

Times Educational Supplement Connect, UK


"TES Connect is the central focus for the UK teaching community to share their ideas, thoughts and views outside the staffroom. It is the world's largest social network for a single profession and allows teachers to connect with other professionals to find and share their best classroom resources and advice."
Teachers Domain, USA
"Teachers’ Domain is an online library of more than 1,000 free media resources from the best in public television. These classroom resources, featuring media from NOVA, Frontline, Design Squad, American Experience, and other public broadcasting and content partners are easy to use and correlate to state and national standards."
Teachers TV, UK

"Through engaging videos, practical resources and an active online community, Teachers TV supports the professional development of anyone working in school, enabling them to widen their skills, develop their practice, and connect with others in the field."
Royal Society for Chemistry
"The RSC is the largest organisation in Europe for advancing the chemical sciences. Supported by a worldwide network of members and an international publishing business, our activities span education, conferences, science policy and the promotion of chemistry to the public."
Have a look through at the many blogs registered at the International Edubloggers Directory or Science Blogs and find one or ten that interest you and suit your professional development needs.

Whether you are a presenter or a teacher being presented too, avoid at all costs death by Powerpoint (yawn!)


and remember that more often than not the best PD occurs over a coffee in the staffroom or a few beers in the local pub.  Have a great week!

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