[paul.fr]

What you need

some water that has been cooled for a few hours.
hot water
food colouring
a glass or glass jar


What you do

Half fill the glass with hot water, add a few drops of food colouring and give it a good stir. Now add the cold water.

What happens?

[Karen W.]

Cool I will try them with the children they can each do their own picture print with the mushrooms. Nice!!

[paul.fr]

Here is the one you aked for, Karen.

What you need


Hot water
baking soda
Aluminium foil
a bowl
silver cutlery


What you do

Put a cup full of baking soda in to the bowl, and add six cups of hot water. Stir until tyhe baking soda is disolved, then add strips of the aluminium foil.

Put the cutlery in to the bowl, after a few minutes remove the silver cutlery and give it a good rinse. then a nice little polish.

[paul.fr]

What you need

a dark room
a stsndard "white" light bulb
a red light bulb
any other coloured bulbs you have or can get
a white wall or large sheet of white paper
two lamps
the bulbs should be the same wattage.


What you do


First, shine the white light onto the white wall. Put your hand in between the light and the wall and look carefully at the shadow. See if you can make a shadow that looks like a bird, or whatever shadow shpe you can make. The shadows look normal, dark areas on the white wall.

Turn off the white light and turn on the red one. Try making shadow pictures again. It works pretty much the same, except that now the wall looks red instead of white. The shadows are still dark. With the two lights about a foot apart, turn on both lights. With both lights shining on the wall, it will probably look white. The white light tends to overpower the red. Place your hand to make a shadow again.


you now have two two shadows, one from each light. One shadow will be red. The other shadow is ?

If you managed to get hold of different coloured light bulbs, replace the red bulb with your different coloured bulb. what do you see now?


If you do not have two lams, you could always use two torces. Just make sure the are on "flood" and not a concentrated "spot", you can easily make coloured filters for your torch.



The following information is supplied by George, another_someone, and may help you if you want to make filter for your lamp if you can not find different coloured bulbs.

Probably the simplest improvised filters you can produce for lighting would be coloured acetate sheets (but they are likely to be very uncalibrated in their colour, and you will have to make sure they do not get too hot).

Another option for creating colour is not to use direct filters that allow transmitted light of a given colour, but to use coloured reflectors that reflect the colour you want onto the subject (you will have to make sure that you block off any direct light between the source and the subject, and that the subject is only illuminated by reflected light).

[Karen W.]

COOL THANKS PAUL! I AM GOING TO TRY THEM!!!! SOUNDS FUN< THE KIDS WOULD LOVE THE SHADOW ONE> WE DID A SHEET WITH ALL THE LIGHTS OFF AND LET THEM MAKE SHADOWS> THIS COULD BE REALLY COOL IF WE PLAN IT RIGHT! THANK YOU THANK YOU THANKYOU!!!! FUNNNN!!!!YAYYYYYYYYYYYY!!!!!!!!

[neilep]

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 ?

[Karen W.]

LOL... I can imagine The looks on your childrens faces as you perform this experiment!! LOL

[paul.fr]

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

[paul.fr]

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.

[paul.fr]

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?
 

[mhorton]

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.

[mhorton]

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.

[daveshorts]

Be careful when electrolysing salt, as you will generate chlorine, which whilst will probably mostly dissolve, was used as a chemical weapon...

[paul.fr]

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

[Karen W.]

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]

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?

[paul.fr]

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

[paul.fr]

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 it’s 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?

[WylieE]

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]

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?