FOOD COLOURING, BLEACH AND DISHWASHER SOAP

WE NEED:

• A deep dish
• Full-cream milk
• Dishwasher soap
• Food colouring
• Cotton swabs 

HOW TO DO IT:

1. Put some full-cream milk in a deep dish.

2. Add food colouring in the centre of it.

3. Dip a cotton swab in the dishwasher soap.

4. Put the cotton swab in the centre of the food colouring.

PREDICTIONS:

PROCESS:

RESULTS:

Full-cream milk, as the name says, contains all the fat or grease that normal milk has. As you know, dishwasher soap is degreaser, which means that takes out the grease. Food colouring helps us see the movement of the milk, and it moves because it has grease and we are adding a degreaser, it is like the milk is "afraid" of the soap.

MILK (FAT OR GREASE)

+

DISHWASHER SOAP (DEGREASER - TAKES OUT THE FAT OR GREASE)

=

THE MILK GOES AWAY FROM THE SOAP

OUR OPINION:

USE A STRAW TO STAB A POTATO

WE NEED:

• Plastic drinking straws.
• A raw potato.

HOW TO DO IT:

1. Take the plastic drinking straw.
2. Try quickly stabbing the potato.
3. Repeat the experiment with a new straw.
4. Put your finger over the top, covering the hole.
5. Try quickly stabbing the potato.    

    

PREDICTIONS:

The straw is going to stab the potato in both tries.


RESULTS:

Placing your thumb over the hole at the top of the straw improves your ability to pierce the potato skin and push the straw deep into the potato. The first time you tried the experiment you may have only pierced the potato a small amount, so why are you more successful on the second attempt?

Covering the top of the straw with your thumb traps the air inside, forcing it to compress and helping the straw not being deformed as you stab the straw through the potato skin. This makes the straw strong enough to pierce the potato, unlike the first attempt where the air is pushed out of the straw.

STRAW

+

THUMB (AIR TRAPPED - COMPRESSED)

=

PIERCED POTATO

MY OPINION: 

This experiment has been great because I did not expect the straw is nailed to the potato.

BY: ALBA

TASTE TESTING WITHOUT SMELL

WE NEED:

• A small piece of peeled potato.
• A small piece of peeled apple (same shape as the potato so you can't tell the difference)

HOW TO DO IT:

1. Close your eyes.
2. Mix up the piece of apple and the piece of potato.
3. Hold your nose.
4. Eat each piece, can you tell the difference?

PREDICTIONS:
We think that we are going to recognise the apple and the potato.



PROCESS:

RESULTS:
Some of us could recognise the food, but others couldn't!

Your nose and mouth are connected through the same airway, which means that you taste and smell the food at the same time. 

Your sense of  taste can recognize salty, sweet, bitter and sour. When you combine this with your sense of smell you can recognise many other individual 'tastes'. Take away your smell (and sight) and you limit your brain's ability to tell the difference between certain foods.

MOUTH: SENSE OF TASTE (salty, sweet, bitter and sour)

+

NOSE: SENSE OF SMELL

=

A LOT OF TASTES

MOUTH

-

NOSE

=

DIFFICULT TO DIFFERENTIATE SIMILAR TASTES

MY OPINION:

I liked it very much because it has been fun and I laughed a lot.

BY: ALBA

FOOD COLOURING & BLEACH

WE NEED:
          

• A glass
• Water
• Food colouring
• Bleach

HOW TO DO IT:

1. Put some water in the glass.                                                                                                                             
2. Add food colouring.                                                                                                                                     
3. Add some bleach.                                                                                                                         
4. Mix it.                                                                                                                                                                                                                                                                          

PREDICTIONS:

RESULTS:

There is a component in the bleach (sodium hypochlorite) that is a strong oxidant. This means that it takes electrons from other compositions, discolouring them. To sum up, bleach "steals" electrons from food colouring and they can't colour the water anymore.

FOOD COLOURING (electrons)

+

BLEACH (sodium hypochlorite = oxidant)

=

NO COLOUR

MY OPINION:

I like the experiment because the bleach changed the colour of the food colouring.

                                                                                                        BY: Dèlia