EXPLORE WATER THROUGH A MICROSCOPE

Once upon a time, we used to ignore things we couldn't see. But thanks to modern science, we know there's a whole lot happening on the microscopic scale that can help us to live our lives more effectively. Scientists have known since the 17th century that the insides of living things are made up of tiny functioning factories called cells; understanding how they work helps us to tackle sickness and disease. More recently, during the 20th century, scientists figured out how materials are made of atoms and how atoms themselves are built from smaller "subatomic" particles; understanding atomic structure paved the way for all kinds of amazing inventions, from electronic transistors to nuclear power. The bacterium is too small to be seen without a microscope.

First you need to set up the microscope at its highest setting. Take one of your water samples and put it on the slide. Focus the microscope on the slide and observe closely.Record the movement and behaviour of th microorganism and draw a picture of what you see. There are three tupes of creatures you might see:

1. Algae Those yellow, green or red things are not plants; scientists classify them as organisms that exist in isolation or in chains.

2. Protozoa These creatures resemble algae but have a tail that can be pretty hard to spot.

3.Amoeba These microorganisms move with wobbly movements and form a blob in order to consume their food.

TOMATO BATTETIES FOR A LIGHTBULB

You can produce electricity with two metal strips and a tomato! Hear the electricity crackle using a pair of headphones. We used a ripe red tomato from a grocery store, although green tomatoes will work even better, as they are more acidic. This experiment is most impressive with metal electrodes, but many different kinds of metal will work. Try using a piece of copper wire (or a penny made before 1982), and a paper clip or galvanized nail. Although we suggest using alligator clip leads because they are easier to connect, any insulated copper or electrical wire will work well

To produce more power, connect two tomato battery cells together. With a wire lead connect one positive terminal (copper) to the negative terminal (zinc) on the other cell. Hook a wire lead onto each of the remaining terminals, then hold the two free ends of the leads up to touch the headphone plug..

If you want to take an accurate measure of the power in volts and amps that your tomato battery is able to produce, use a digital multimeter. You can also try powering other small electronic devices with your tomato battery! You'll need to make three or four battery cells, and connect them in a complete circuit (try both series and parallel). You can power a small light bulb or a buzzer this way. You can also experiment with other homemade batteries - use salt water, vinegar, or a potato.

ACID AND BASE WATER COLOUR CHANGE

The secret of this magic color change is pH. Chemicals with a low pH (0-6) are acidic, while those with a high pH (8-14) are basic. (A pH of 7 is neutral: neither acidic nor basic.) Universal indicator is a chemical that changes color in the presence of acids and bases from a pH of 2 to 10. Acids turn the indicator red, pink, orange, and yellow, while bases turn it green, blue, and purple. Vinegar is an acid, so when you poured the indicator solution into the second flask, it turned red. Ammonia is a base, so when you mixed the acidic vinegar solution with ammonia, it raised the pH and the water turned blue. If you had enough vinegar in your last flask, the solution should have turned red again. (If it didn't, try adding a little more vinegar.)

What is PH-BALANCE? The pH scale ranges from 0 to 14. 7 is in the middle, so it is neutral, being neither acid or alkaline. The lower the number, the more acidic a substance is. The higher the number, the more alkaline that substance would be.

The Experiment Explained

Test tube One contains water with a little bit of universal indicator, which is a chemical that changes colour in the presence of acids and bases, based on their pH-value. Test tube two contains a dropper full of vinegar. When universal indicator comes in presence of a acid, it turns red or pink. That is why the colur changes when you pour some of the fluid from test tube on einto test tube two. Tets tube thee contains Amoniac, and amoniac is a very strong base. So, when the red vinegar from test tube two goes into the aminiac, the universal indicator turns blue or green, depending on the strenght of the base.