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Author Topic: What's your kitchen science?  (Read 398521 times)

Offline neilep

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Re: What's your kitchen science?
« Reply #25 on: 23/03/2007 14:45:49 »
What you need.

A few Eggs , Strawberries (or any other soft fruit)
A mallet


What you do


Place the eggs and fruit on the kitchen table
making sure all are around to view the results.

Apply a sharp thwack to the eggs and fruit.


What happens ?


 

Offline Karen W.

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Re: What's your kitchen science?
« Reply #26 on: 23/03/2007 15:51:49 »
LOL... I can imagine The looks on your childrens faces as you perform this experiment!! LOL
 

paul.fr

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Re: What's your kitchen science?
« Reply #27 on: 23/03/2007 22:43:11 »
What you need


Lemon juice
cotton bud/s
absorbant paper/kitchen roll
an iron


What you do

Dip the cotton bud in to the lemon juice and make some pretty picture or just writing on the paper/kitchen roll. when finished leave your paper/kitchen roll to fully dry for 10 to 15 minutes.

You don't want to soak the paper/roll.

Now run your hot iron over the paper/kitchen roll.

What happens?


you can try it with other things, such as cabbage juice
« Last Edit: 24/03/2007 07:01:00 by paul.fr »
 

paul.fr

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Re: What's your kitchen science?
« Reply #28 on: 24/03/2007 08:03:48 »
Are you hot enough!


What you need

Tap water
Rubbing alcohol
Clear, narrow-necked plastic bottle
Food colouring
Clear plastic drinking straw
Modeling clay


What you do

Pour equal parts of tap water and rubbing alcohol into the bottle, filling about a quater hight.

Add a couple of drops of food colouring and mix.Put the straw in the bottle, but don't let the straw touch the bottom.

Use the modeling clay to seal the neck of the bottle, so the straw stays in place and hold your hands around the bottle.

What happens?

Warning: Do not drink the contents of the bottle, supervise any children.
« Last Edit: 24/03/2007 08:06:16 by paul.fr »
 

paul.fr

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Re: What's your kitchen science?
« Reply #29 on: 25/03/2007 00:01:02 »
Electrolosis

What you need


A 9 volt battery
Two pencils
Salt
Thin cardboard
Electrical wire
Small glass
Water


What you do


Sharpen each pencil at both ends.
Cut the cardboard to fit over glass.
Push the two pencils into the cardboard, about an inch apart.
   
Dissolve about a teaspoon of salt into the warm water and let sit for a while.

Using one piece of the electrical wire, connect one end on the positive side of the battery and the other to the lead at the top of the sharpened pencil. Do the same for the negative side connecting it to the second pencil top.

Place the other two ends of the pencil into the salted water.

What do you see, and why?
 
« Last Edit: 25/03/2007 00:14:21 by paul.fr »
 

Offline mhorton

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Re: What's your kitchen science?
« Reply #30 on: 26/03/2007 07:27:59 »
What you need:

Plastic overhead transparency sheet (acetates)
Scissors
Dishwashing liquid
Bowl of water

Cut the transparency sheet into small boats with a channel coming out of the rear of the boat.

Float the plastic boat in a bowl of water and let it set until the water is still.

Place a single drop of liquid soap in the channel of the boat.

What happens?

Very cool.  There are several very reasonable explanations for this, but the most common involves surface tension.
 

Offline mhorton

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Re: What's your kitchen science?
« Reply #31 on: 26/03/2007 07:33:34 »
What you need:

A roll of transparent tape
A dark room (optional)

Peel off a piece of transparent tape approximately 4 cm long and hand it to an assistant.

Peel off another piece of transparent tape approsimately 4 cm long.

Bring the two pieces of tape near each other.  What happens?

Stick a 4 cm piece of tape flat onto the surface of a table.  Fold over the end so that you can lift it off the table later.

Stick another 4 cm piece of tape on top of the first.  Fold over the end so that it can be lifted up.

Quickly lift the top piece of tape and hand it to an assistant.

Quickly lift the bottom piece of tape.

Bring the pieces of tape near each other.  What happens?

In a dark room after your eyes have adjusted to the darkness, quickly pull some transparent tape off of the roll.  What happens?

Hints: Static electricity, unlikes attract, likes repel.
 

Offline daveshorts

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Re: What's your kitchen science?
« Reply #32 on: 26/03/2007 11:22:47 »
Be careful when electrolysing salt, as you will generate chlorine, which whilst will probably mostly dissolve, was used as a chemical weapon...
 

paul.fr

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Re: What's your kitchen science?
« Reply #33 on: 27/03/2007 06:03:49 »
following on from the experiment posted by mhorton, a similar one was done on the naked science show using a matchstick. Here is another variation.


What you need

a bowl
milk
3 or more different food colourings
liquid soap/washing-up liquid
a toothpick


What you do

pour some milk in your bowl, and put some of the food colouring in the milk.

take your toothpick and dip it in the liquid soap/washing up liquid, then dap the toothpick in the centre of the bowl

topic link

Surface Tension !..what is it ? http://www.thenakedscientists.com/forum/index.php?topic=4710.0
« Last Edit: 21/05/2007 07:58:51 by paul.fr »
 

Offline Karen W.

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Re: What's your kitchen science?
« Reply #34 on: 28/03/2007 10:06:40 »
CD LOVE

1 new blank CD
1 microwave
five seconds on the microwave insert cd into microwave close door! LOL
Press start and watch closely!

when microwave stops remove cd and examine...

BTW It did not damage my Microwave!
 

paul.fr

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Re: What's your kitchen science?
« Reply #35 on: 28/03/2007 20:33:47 »
Three for the price of one!


What you need

three eggs.
five glasses
vinegar
corn syrup
water
3 days!


What you do

Put the three eggs in to the seperate glasses, and fill the glass with vinegar. Wait two or three days!

What do you notice?.....the egg has no shell!  Why?

Experiment one

Take one of your eggs, feels strange. now try dropping it from a few inches high on to your work surface, what happens? repeat with increasing height until you, A, get bored or B have a smashed egg.

Experiment Two

Take one of the other eggs and put it in an empty glass, fill the glass with water. What happens?

Experiment three

Take the last egg. put it in your remaining empty glass and fill with corn syrup. what happens?
« Last Edit: 29/03/2007 10:51:38 by paul.fr »
 

paul.fr

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Re: What's your kitchen science?
« Reply #36 on: 28/03/2007 22:08:58 »
What you need

a candle
matches or a lighter
several balloons
water


What you do

Blow up one of the balloons and tie it off. Light the candle.  Carefully, hold the balloon just at the top of the candle
flame.

What happens? you guessed it, the balloon burst.

Carefully stretch the mouth of the other balloon over a tap( american: water faucet) and slowly fill the balloon with water. Then blow in a little air and tie it off.

Once again, light the candle, and hold the balloon over the candle, just at the top of the flame.

What happens this time?


Please use caution when using candles
« Last Edit: 29/03/2007 10:53:12 by paul.fr »
 

paul.fr

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Re: What's your kitchen science?
« Reply #37 on: 28/03/2007 22:19:59 »
What you need

Glass bottle. One with a short neck works best.
A medium-sized balloon with the neck of the balloon cut off just below the opening
A large bowl
Water



What you do

Fill the glass bottle with warm-to-hot water and Let it sit for about 3 minutes so the bottle warms up. Then Pour cold water into the bowl until itís about 3/4 full.

empty the warm water out of the bottleand Stretch the balloon over the top of the bottle.
Put the bottle into the bowl of water.

What happens?
 

Offline WylieE

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Re: What's your kitchen science?
« Reply #38 on: 29/03/2007 02:17:19 »
What you need:
A rubber band- a good thick one works better, but any one will do

What to do:
Hold the rubber band with both hands.
Put it up to your lips or forehead and feel the temperature.
Now stretch it out.  Now quickly put it up to your lips or forehead again- is there a change in temperature?  Now let it relax and check the temperature again. 

What's going on?
Check out this thread:
http://www.thenakedscientists.com/forum/index.php?topic=6955.0

Colleen
 

paul.fr

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Re: What's your kitchen science?
« Reply #39 on: 31/03/2007 11:54:15 »
What you need

Soda water/fizzy water
empty bottle or glass
rasins

What you do

Fill the glass or bottle half full with soda water. Drop three or four raisins into the water.
wait a while.

what happens?
 

paul.fr

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Re: What's your kitchen science?
« Reply #40 on: 31/03/2007 11:58:51 »
an old favourite

What you need

A narrow necked glass bottle
3 matches
a peeled, hard bolied egg

What you do

Drop three lit matches into the glass bottle. Quickly put the hard-boiled egg on the mouth of the bottle.

What happens?
 

Offline Karen W.

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Re: What's your kitchen science?
« Reply #41 on: 31/03/2007 17:49:08 »
HEE HEE HEE! That one is also my favorite, I have a question about the results of this one. I have done it several times..and each time am at a loss for retrieving my lunch from the bottle, LOL Can one reverse the process Paul? LOL
 

Offline Karen W.

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Re: What's your kitchen science?
« Reply #42 on: 31/03/2007 17:52:46 »
I also have a question if one pierced an egg before cooking and did this same experiment, would the suction be strong enough to pull the yolk from the shell leaving the shell whole. You know like when you blow the contents out?
 

paul.fr

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Re: What's your kitchen science?
« Reply #43 on: 31/03/2007 17:58:16 »
May be i should have included that  [:I]

Turn the the bottle upside-down, Put the bottle over the top of your head, like you are leaning you head back and looking up at the bottle.

Wit the bottle about half and inch from your mouth, blow into the bottle hard, and don't stop. The egg should come out.

or you can heat the bottle under warm water and the egg will come out.
« Last Edit: 31/03/2007 18:02:49 by paul.fr »
 

paul.fr

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Re: What's your kitchen science?
« Reply #44 on: 31/03/2007 18:27:26 »
I also have a question if one pierced an egg before cooking and did this same experiment, would the suction be strong enough to pull the yolk from the shell leaving the shell whole. You know like when you blow the contents out?

I like that, give it a try and let me know would you?
 

Offline Karen W.

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Re: What's your kitchen science?
« Reply #45 on: 31/03/2007 18:48:27 »
May be i should have included that  [:I]

Turn the the bottle upside-down, Put the bottle over the top of your head, like you are leaning you head back and looking up at the bottle.

Wit the bottle about half and inch from your mouth, blow into the bottle hard, and don't stop. The egg should come out.

or you can heat the bottle under warm water and the egg will come out.


LOL LOL.. HEE HEE HEE!!  I don't know if I have enough air to continuely blow like that, BUT Paul, I think you should try it, but shouldn't you be "SUCKING" instead of blowing??? Will the egg really come out if you are blowing! LOL

So you never tried the other one.. HUMMMMM I will have to try it out and see!!!
 

paul.fr

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Re: What's your kitchen science?
« Reply #46 on: 31/03/2007 19:07:15 »

shouldn't you be "SUCKING" instead of blowing??? ! LOL


No, it's all to do with air pressure. If you don't have the lungs for blowing you could always use a hairdryer. or, add about an inch of water to the bottle and break up an alka seltzer tablet/bicarbonate of soda . Put the tablet in the bottle then turn the bottle upside down. The pressure from the expanding gas should blow the egg out of the bottle.
 

Offline Karen W.

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Re: What's your kitchen science?
« Reply #47 on: 31/03/2007 19:18:20 »
 OH that is interesting, I guess me brain doesn't work like that, cause that never occured to me. HMMMMM I will try it next time!

I could try the hair dryer that might do it! we will see!
 

paul.fr

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Re: What's your kitchen science?
« Reply #48 on: 01/04/2007 23:58:57 »
Found this one on the net. similar to one done by Dave


What you need

water
a squirt of dishwashing liquid
1/2 a teaspoon of salt
1 teaspoon of ice cold ethanol or methylated spirits or rubbing alcohol (isopropanol)
two cups and
a clear container with a lid


What you do

1.Dissolve half a teaspoon of salt in half a cup of water. Add a squirt of dishwashing liquid. This liquid will be used to break up the cells and release the DNA.

2.Take about a tablespoon (20 - 25 mls) of plain water into your mouth. Don't swallow! Swish the water around your cheeks vigorously for about 30 seconds. This removes some cheek cells. Spit the water into a clean cup or glass.

3.Add about 1 teaspoon (5 mls) of this fluid to a small clean container with a lid (a 20 ml test-tube or a clear plastic film canister would work). Add about half a teaspoon (2.5 mls) of the salt/dishwashing liquid (saline/detergent) solution. Put the cap on the container and tip it up and down gently 3 or 4 times to mix (but you don't want a lot of froth so don't shake it). This will break up the many hundreds of cheek cells, releasing the DNA from the nucleus.

4.Gently run a teaspoonful of ice-cold ethanol into the tube. Methanol or rubbing alcohol - isopropanol - should also work; make sure they are ice cold by placing the bottle in the freezer for a few hours before the experiment. Watch the point where the two layers meet. You may see strands of DNA forming, as cloudy filaments stretching up into the top (ethanol) layer. DNA is not soluble in ethanol, so when the ethanol meets the DNA solution it starts to precipitate (form a DNA salt).

5.You may be able to hook out the strands of DNA with a glass hook (or one made from a plastic twist-tie) by slowly dipping up and down through the two layers. If this doesn't work, gently invert the tube several times until the alcohol is mixed in. The precipitated DNA will look like a small ball of white thread.

topic link

HOW IS DNA SEPARATED FOR DNA FINGERPRINTING? http://www.thenakedscientists.com/forum/index.php?topic=5889.0
An excellent experiment by Daveshorts (Dave Ansell) http://www.chaosscience.org.uk/pub/public_html//article.php?story=20050524184709373
« Last Edit: 21/05/2007 08:06:41 by paul.fr »
 

paul.fr

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Re: What's your kitchen science?
« Reply #49 on: 02/04/2007 00:36:11 »
An easy one, to confuse the kids with.

What you need

A small apple or orange
a piece of paper


What you do

Hold the apple/orange and the paper at the same height from the ground and drop them at the same time.

Which hits the ground first? yes the apple/orange

Now scrunch the paper into a round ball the same size as the apple/orasnge and repeat dropping them from the same height.

Which hit the ground first this time?
 

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Re: What's your kitchen science?
« Reply #49 on: 02/04/2007 00:36:11 »

 

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