that the water molecule is composed of one oxygen atom and two hydrogen atoms;
that the water at a room temperature is a liquid.
You will learn
to describe the water cycle (hydrological cycle) in nature;
to indicate the causes and consequences of water pollution;
to provide ways to protect water.
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Pollutions of natural waters
Pure water does not occur in nature. It can be obtained as a result of distillation. It's called distilled waterdistilled waterdistilled water. Substances found during water cycle are contained in the water occurring on the Earth. For this reason, natural waters are aqueous solutions. Meteoric water (rain, snow, hail) should be free of dissolved solids before it has contact with the surface of the Earth. However, it is free only in areas free from pollution caused by human activity or the eruption of volcanoes. Natural waters may contain both desirable and harmful components for living organisms, so‑called pollution. These limit water resources and pose a threat to plant development as well as to animal and human health.
Task 1
Compare the amount of dissolved substances in different types of water: distilled, mineral, tap, sea, rain, from the river (lake), puddle. To do this, apply the same number of drops of each of the mentioned types of water to the glass plate (Petri dish or mirror). Make sure that the samples do not mix with each other. Leave the plate until the water evaporates completely. Compare the dry residues on each of them. Evaluate which type of water contains the largest amount of dissolved substances in it.
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Effect of water pollution
Task 2
Jakie są przyczyny zanieczyszczeń wody.
Jakie są przyczyny zanieczyszczeń wody.
View the gallery below. Consider what effects can water pollution have and make notes.
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Task 3
Before you watch the film „Effects of petroleum derivatives actions on bird feathers”, write down the research question and hypothesis. Note down your observations and conclusions after watching the movie.
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Exercise 1
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Summary
Natural waters, found in nature, are solutions of various solid substances and gases.
A lot of the substances are contained in sea water, the least - water from atmospheric precipitation.
Natural waters are exposed to pollution. These are municipal and industrial sewage, leachate from garbage dumps, solutions containing fertilizers and plant protection chemicals flowing down from the fields during rainfall, as well as substances entering the aquatic environment during rare, but large‑scale, dangerous sea catastrophes and cataclysms.
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Keywords
Distilled water, pollutions, seawater
Glossary
distilled water
distilled water
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woda otrzymana w wyniku destylacji; nie zawiera rozpuszczonych substancji