Louise Posted November 30, 2007 Share Posted November 30, 2007 I promised to post this yesterday but ran out of time so here goes How to turn a fried egg white green Materials Shredded red cabbage Boiling water Frying pan Cooking Oil One Egg Method Boil the red cabbage for approx 20 minutes Squeeze the juice from the cabbage once it has cooled into a jug Heat the oil in a frying pan and start to fry the egg Just as the egg is beginning to turn from clear to white drip a little of the cabbage juice onto the setting white The white will turn lurid green where the juice hits it Anyone for green spotty egg whites Whats going on The science bit Red cabbage juice is a good indicator of pH which is whether something is acid or alkali It goes green when exposed to an alkali and red when exposed to an acid So now you can turn ammonia green if you want or lemon juice and vinegar red I have a couple more eggy ones of these I will put another one in later Quote Link to comment Share on other sites More sharing options...
Laura & CTB Posted November 30, 2007 Share Posted November 30, 2007 Fantastic and the girls can eat the red cabbage afterwards ( cos I'm not going to ) Quote Link to comment Share on other sites More sharing options...
Guest Posted November 30, 2007 Share Posted November 30, 2007 that's really interesting, like something from Brainiac! Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 Next one Sucking Eggs (or how to get a hard boiled egg undamaged into a bottle) Materials A Hard boiled egg (not too fresh an egg as you need to shell it) A bottle with an opening slightly smaller than the circumference of the egg when it iis placed upright atop the bottle. (milk bottle is ideal for a regular egg maybe a wine bottle for a bantam) Long matches Method Shell the egg so the soft rubbery white is exposed Place the bottle on a flat, flame resistant surface Light a match and drop it into the bottle making sure it stays alight Add a few more matches as quickly and safely as possible, if you can add them all at the same time Put the egg pointed side down on top of the neck of the bottle What will you see?? The matches will soon go out s they will be starved of oxygen once the egg seals the end and the egg will be pulled into the bottle looking a bit peculiar as it contracts in order to get through the neck of the bottle. What’s going on?? The lighted matches heat up the air inside the bottle causing it to expand. This means that some of the expanded air escapes from the bottle before the egg in place on the top When the egg is placed on the top and the matches go out the air contracts again causing a lower pressure inside the bottle than outside The greater pressure outside causes the egg to be forced into the bottle Can you get it out again Yes of course you can Hold the bottle on its side and jiggle it so its narrow end is resting against the bottles neck Turn the bottle upside down and form a seal between your mouth and the bottle opening Now blow hard Be careful as the egg can come out at quite a speed Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 Expanding eggs Materials Raw unshelled egg Jar of vinegar Method Place egg in vinegar Close jar Leave for a few days What will you see Shell will disappear and the egg will swell to about twice its size (remember this is a RAW egg) Whats going on The shell (calcium carbonate) reacts with the acetic acid in the vinegar which will create carbon dioxide, water and calcium The water passes into the egg through the exposed membrane (the tough papery bit under the shell) This is the process of osmosis (passage of water from a region of high water concentration to a region of low water concentration through a semi permeable membrane reducing the difference between the two) Can you reverse this Of course you can:lol: Place the swollen egg in a solution of 75% sugar syrup and 25% water After a couple of days it will shrink back to less than its original size as the osmosis works the same but in the opposite direction I think I have too much time on my hands today Quote Link to comment Share on other sites More sharing options...
The Dogmother Posted November 30, 2007 Share Posted November 30, 2007 I love those louise - guess what Rosie will be doing this weekend Quote Link to comment Share on other sites More sharing options...
Guest Posted November 30, 2007 Share Posted November 30, 2007 here's a weird one- DON'T TRY THIS ONE AT HOME! http://www.metacafe.com/watch/403553/peel_a_raw_egg/ Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 Last one Silver lining Materials A white or pale brown egg Matches A candle Water A glass bowl Method Light the candle and carefully hold the egg between your finger and thumb (may need to use tongs for this) Hold the egg near the top of the candle flame (not in the flame) The object is the get the egg sooty Rotate the egg to cover the entire surface Fill the bowl with water Carefull place the egg in the water What will I see Once in the water the egg will appear neither egg or soot coloured It will look silver with a mirror like quality Whats going on The egg is covered with a thin layer of bubbles because the soot repels water Light passing through the water strikes this layer and is reflected back like a mirror Eventually the air bubbles will dissolve and the shell will look sooty again This egg is still edible Strictly speaking this one is kitchen physics Now I have to go and do some work Quote Link to comment Share on other sites More sharing options...
Goosey Lucy Posted November 30, 2007 Share Posted November 30, 2007 Wow! I'm really impressed with all of these ideas. OH is going away again Sunday lunchtime so we might be doing some experiments in the afternoon. Thanks! Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 Just so you all know I am not a somplete brainbox These all came from a book called How to fossilise your hamster And just so you know that one involves finding the right type of hole in the earth and bunging your deceased hamster into it and leaving it for a couple of million years Quote Link to comment Share on other sites More sharing options...
Lesley Posted November 30, 2007 Share Posted November 30, 2007 I noticed that book on Amazon last night when I was looking at a book called Do Ants have.......... (can't finish this title in here!) I wish I'd clicked on it now........ Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 There is also one called does anything eat wasps A girl at work brought the hamster one in and I immediatety homed in on the egg ones I may even try these one day If anyone does be sure and take a picture Quote Link to comment Share on other sites More sharing options...
Goosey Lucy Posted November 30, 2007 Share Posted November 30, 2007 The books are based on articles/letters in the New Scientist magazine I think. we have 'Why Don't Penguins Feet Freeze?' or similar. Can't remember now. Quote Link to comment Share on other sites More sharing options...
The Dogmother Posted November 30, 2007 Share Posted November 30, 2007 I may even try these one day If anyone does be sure and take a picture a picture of the egg shooting out of the bottle into someone's gob! I nearly cried with laughter at that image! Quote Link to comment Share on other sites More sharing options...
Egluntyne Posted November 30, 2007 Share Posted November 30, 2007 Heston Blumenthal would be impressed Louise! Quote Link to comment Share on other sites More sharing options...
Laura & CTB Posted November 30, 2007 Share Posted November 30, 2007 I noticed that book on Amazon last night when I was looking at a book called Do Ants have.......... (can't finish this title in here!) Well I just had to go and look didn't I Quote Link to comment Share on other sites More sharing options...
Cate in NZ Posted November 30, 2007 Share Posted November 30, 2007 I saw the egg in a bottle one done on TV recently, can't remember when, but very effective. I'd love to try some of the others, I think my children might be a bit if I were to try demonstrating to them, but I'm planning on having a go anyway Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 I made a submarine out of a sauce sachet at lunchtime today The work experience girl we have in today looks scared Quote Link to comment Share on other sites More sharing options...
The Dogmother Posted November 30, 2007 Share Posted November 30, 2007 Put one of your orange suits on Lousie - that'll scare her even more Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 Can't take her into that room Clare that is where we keep the nasty things Quote Link to comment Share on other sites More sharing options...
The Dogmother Posted November 30, 2007 Share Posted November 30, 2007 What, nastier than the staff canteen? Quote Link to comment Share on other sites More sharing options...
Louise Posted November 30, 2007 Author Share Posted November 30, 2007 way nastier Quote Link to comment Share on other sites More sharing options...
