Scientific aspects of water

3rd project meetingPoland

Raba WyznaMay 2013

ZŠ a MŠ Hranice, Šromotovo,příspěvková organizace

• Tento projekt byl realizován za finanční podpory Evropské unie.

• Za obsah publikací (sdělení) odpovídá výlučně autor. Publikace (sdělení) nereprezentují názory Evropské komise a Evropská komise neodpovídá za použití informací, jež jsou jejich obsahem.

Aquatic AnimalsCzech ponds, lakes and rivers teem with

animals - fish of all kinds, annoying insects, frogs and small snakes.

This is our typical fish – a carp.

FishCatfish Pike

Zander Trout

Eel Perch

Sturgeon Carp

MammalsBeaver Otter

Insects Mosquito Water beetle

Treader Dragonfly

Toad

Grass snake Slow - worm

Snakes

Aquatic plantsMarsh marigold

Water buttercup grows to 30-50 cm, rarely about 1 meter. Marsh marigold is widespread in Europe (in the south just a little) and grows in large areas of Asia and North America.

Algae

Algae are simple photosynthetic organisms traditionally classified as lower plants. In fact algae grouping unrelated groups of organisms, and some of them are close to plants. Algae can be, depending on the type used both as food and fuel or raw material for the production of hydrogen, methane and biofuels.

Waterlily

Its leaves spread on the water surface. Most are located in the middle of ponds, streams and stagnant water. Creeping rhizome is firmly anchored in the muddy bottom (in heavy soil and poor in nitrogen).

People and water

The human body contains:

• 23 % of carbon• 2,6 % of nitrogen• 1,4 % of calcium

- trace amount of more than 30 other elementsThe most important is oxygen and hydrogen = water.

The water content in the human body by age:

• infants 4/5 water• adults about 2/3 water• old people about half the weight

• The human body contains 72% water.

Effects of water:• diluted nutrients and waste products of fission• allows nutrient absorption and transport to the place of their further transformation in the body• allows elimination of unwanted substances from the body (urine, sweat)

• a person should drink 2-3 liters a day of water

WATER AND

PHYSICS

Two groups of the VI A class made a research with their Physics teacher, our

headmaster.We would like to present their work and

results. Each group performed measurements,

wrote the report, constructed charts and created a slide show depicting measurements.

Check the electrical conductivity of salt

waterZŠ a MŠ Hranice, Šromotovo,

the Czech Republic

Authors: Karolína Hendrychová-photos

Markéta Vanduchová-presentation

Klára Tolášová,Michaela Švábenská,Monika Tomečková -

measurement

Tools: the ammeter, the voltmeter, the DC voltage source, the resistor, light bulbs, switches, wires, water,

salt, copper electrodes, digital scales, a spoon, a mixer, a bath

Procedure:1. Assemble the circuitaccording to the scheme.

Procedure:2. Measure the voltage on the

source and the electrical current passing through the solution.

Procedure:3. The scales weigh small quantities of

salt (about half a teaspoon) and shovel it into the water. Stir again and measure

the size of the voltage and current, calculate the electrical resistance.

Simultaneously calculate the concentration of salt.

Procedure:4. Repeat this procedure even

9x.

Diagram

Measuring the density of salt

waterZŠ a MŠ Šromotovo, Hranice,

the Czech Republic

Task: Determine the density of seawater? Materials: the digital

scales, the graduated cylinder, salt, a spoon, a mixer

Procedure:1. Put salt into the water and mix with a mixer.

Procedure:2. Measure the amount of water

Procedure:

3. Determine the mass of water

Procedure::4. Calculate the density of water and write to

the log.

Procedure:5. Hydrometer to measure the density and

write to the log

procedure:This process is repeated even 9x, and always stir in a teaspoon of salt.

Náš tým

Diagram

Závěr

• Conclusion: The difference between the density of seawater determined by calculating a density measured with a hydrometer does not exceed even one case of 1%. We can say that the measurement of both procedures is comparable. The biggest mistake was loaded volume measurement.

• The density of salt water varies depending on the salinity linearly.

• It is interesting that the average salinity of sea is about 3.6% salinity Dead Sea 33%.

WATER AND

CHEMISTRY