3rd project meeting poland raba wyzna may 2013 zŠ a mŠ hranice, Šromotovo, příspěvková...
TRANSCRIPT
Scientific aspects of water
3rd project meeting
PolandRaba 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 Animals
Czech 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
Mammals
Beaver Otter
Insects Mosquito Water beetle
Treader Dragonfly
Toad
Grass snake Slow - worm
Snakes
Aquatic plants
Marsh 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