Observing the properties of water Essay

taste 1 frame a dope off of body of piss on a eloquent plastic sheet or on the bench. Look at it close from the side. Draw the outline of the write down. How atomic number 18 the molecules held in their place?image00.pngThe drop of water supply and the drop of detergent have a different thickness, because the molecules are held differently. The drop of water, in fact, has a higher thickness. The molecules are closed to each some other and its achievable to notice the surface that behaves as an elastic tissue layer that surrounds and compresses the underlying liquid. There is a force of cohesion that determines the surface tension. test 2 Fill a clean 250 ml. beaker with water to about 1 cm. below the top. Carefully float a small filter make-up on the surface. Carefully drop a needle, exactly horizontal, on the paper. hold until the paper becomes soaked and sinks. keep open the needle carefully. After you have sight it, add wizard drop of detergent with a meth or plas tic rod.the piece of paper floats on the water and then it sinks because it suck too wet. the needle continues to float, although its specific gravity is higher than the waters one, maybe because the water surface forms a kind of membrane ( take in ex.1), impenetrable by small objects (as the needle). Adding the detergent, the needle has sunk because the detergent breaks the bonds mingled with water molecules that allowed to the needle to float. Very carefully, its possible to notice that the water surface gets curved under him ( as when we break a membrane, exactly).image01.pngExperiment 3 Place a 250 ml. baker on a sort of bench. Carefully, fill it into the brim (the top). Now carefully add water drop by drop until it begins to overflow. Now carefully add small amounts of ammonium ion Chloride to the beaker using a spatula. How much can you add before the water overflows?Although we put lots of ammonium chloride, the water didnt overflow. Thats very strange, because another little drop of water would make it overflow This happened because the ions of the ammonium chloride attract the water molecules, so they are closer together and thus they take less space.Experiment 4 Fill a baker to halfway. Scatter chalk dust over the surface. Now add one drop of detergent with a glass or plastic rod. Observe and explain.image02.pngThe Lycopodium moved immediately when it enters in contact with the drop of detergent. Thats maybe because the detergent is totally not attracted by the lycopodium. Experiment 5 Fill a clean 250 ml. beaker to about 1 cm. below the top. Place two glass rods in the beaker, side by side. Where is the water amidst them? If its not easy to see, add some drops of a stain to make water more visible.image03.pngWater is just attached to the glass, and it is possible to find it also outside the beaker, in the back of the two glass rods (as shown in the figure). Thats probably because if the space is smaller, the pull is stronger. Glass molec ules are bigger than water molecules, so they use to attract them.