Presentation of the unique properties of water chemistry. Presentation on chemistry on the topic: "Water is an amazing substance in nature"

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Water. Water in nature. Water is a very common substance on Earth. Physical properties of water. Pure water is a colorless, transparent liquid. Chemical properties water. Water molecules are highly resistant to heat. Interaction. C + H2O = H2 + CO. Lime slaking. - Water.ppt

Water lesson

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To consolidate knowledge about the composition, structure and properties of water. Show that water is a unique natural compound. Expand knowledge about the role of water and solutions in nature and human life. Address environmental and moral problems water protection. Lesson plan: Legends of water. Many deities were born in water or could walk on water. She could have drowned her, destroyed her for nothing. History of discovery. June 24, 1783 Lavoisier and Laplace. Synthesis of water from “combustible air” (hydrogen) and “dephlogisticated air” (oxygen). Lavoisier. Experiments on water decomposition. 1785 Lavoisier and Meunier. The composition of the water was determined to be 85% oxygen and 15% hydrogen. - Water lesson.ppt

Water chemistry

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Goals and objectives. Water. Chemical and physical. Properties. Water in nature. The only substance in nature that exists in three states of aggregation. Liquid state. Solid state. Gaseous state. Oxygen atom. Hydrogen atoms. Water molecule. Aggregate states of water. Physical properties of water. (Water). Solid. (Ice). Gaseous. (Steam). Liquid. Water is a solvent. 1. Interaction of water with active metals. Chemical properties of water. Cold air. Warm air. Steam. Ice crystals. Water drops. The cloud is transferred. Air current. Precipitation. Rain. Snow. Hail. - Water chemistry.ppt

Chemistry Water

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Integrated project “Water, water, water all around.” Authors of the project. Duration of the project: 1-3 academic quarters. Fundamental question: What is unique about water? Problematic questions Where is water found in nature? What chemical properties are characteristic of water? What states of aggregation are characteristic of water? How to determine the quality of water in a reservoir based on the state of coastal vegetation? What features are characteristic of the Moshlyaiki River? What is the significance of the river for the village of Tulinovka? Academic subjects. Geography Chemistry Biology Physics Ecology. Educational topics Inland waters of Russia. Solutions. Solubility of substances in water. - Chemistry water.ppt

Substance water

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Water is the most amazing substance on Earth. Is any water healthy? Group work Water! Subject CHEMISTRY Performers “Theorists” - students of group 29 - PKD. Has color; has no color. Has taste; has no taste. Has a smell; has no smell. Transparent; not transparent Has fluidity; does not have fluidity. Has a shape; has no form. Retains heat for a long time; cools down quickly. Dissolves sand and chalk; dissolves salt and sugar. Conducts electric current; does not conduct electric current Polar; not polar. Water is the source of life. Subject BIOLOGY, FUNDAMENTALS OF ECOLOGY Performers “Ecologists” - students of group 28 - PKD. - Substance water.ppt

Water as a substance

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Water. Content. Composition and structure of the molecule. Methods for determining the composition of substances. Water in nature. Water purification methods. Physical properties. Chemical properties. Application of water. What kind of water is there? A water molecule consists of one oxygen atom and two hydrogen atoms. There is a covalent polar bond between atoms. The molecule has an angular structure. Methods for determining the composition of a substance. Water is the most abundant substance on Earth. Rivers, seas, oceans, lakes are filled with it. Water vapor is contained in the air. Water is found in the bodies of animals and plants. Under certain conditions it occurs in all three states of aggregation. - Water as a substance.ppt

Water is a substance

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Water is a unique substance of nature. Water. Lesson topic. Spread of water. Hydrosphere is the watery shell of the Earth. Rivers, lakes, atmospheric moisture. Water in the human body. Methods for determining the composition of water. Composition of water molecule H2O - molecular formula. Physical properties of water. Features of water. Water has a very high specific heat of vaporization. High heat capacity. Chemical properties of water. Water decomposition reaction. Photosynthesis. The water cycle in nature. Oil pollution of the world's oceans. Hydroelectric power stations. - Water is a substance.ppt

Water purification

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I. General recommendations II. Water purification 1. Boiling 2. Filtration 3. Disinfection IV. Desalination of water 1. Freezing 2. Distiller V. Conclusions. I. General recommendations. Search water source– one of the main tasks. Water can be obtained using moisture condensers and plastic bags. Do not drink sea water or soapy water. There is no use in eating snow. Water purification. 1. BOILING (10 min.). Water purification 2. FILTERING. 3. Disinfection. Desalination of water 1. Freezing. Ice, if not all the water has frozen, is fresher than the original water. Water desalination 2. Distiller. How much water should a person drink per day? - Water purification.ppt

Water settling

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Water purification at home is a vital necessity. Settling Procedure: Pour a certain amount into one tap water. Cover with a cloth to prevent foreign impurities from entering the water. Precipitation varies in color saturation and quantity. After settling, the water must be boiled (Part 2). Boiling Procedure: I pour water from the tap, which looks completely clear. I boil water. When heated, the water changes color to yellow (precipitation of iron salts). As the temperature rises, the water acquires a reddish hue. After boiling the water for at least 5 minutes, I carry out settling. - Water settling.ppt

Water in human life

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Integrated lesson in chemistry and geography. “Water is the basis of life on Earth.” It cannot be said that you are necessary for life! You are life itself! You fill us with joy that cannot be explained by our feelings... You are the greatest wealth in the world...” Antoine de Saint-Exupery. The structure of a water molecule. Physical properties of H2O. Hydrosphere. Fresh water. Salty water. Water in the atmosphere. Sushi waters. Glaciers. The groundwater. Lakes. Rivers. Swamps. Diagram of the World Water Cycle. Baikal. Decomposition (electrolysis) of water. The length of the river is 3530 kilometers (before the construction of reservoirs - 3690 kilometers). Of the 100 cities in the country with the most polluted atmosphere, 65 are located in the Volga basin. - Water in human life.ppt

The role of water in the human body

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The role of water in the human body. What is water? The role of water. The role of water in the human body from a physics point of view. Heat capacity and thermal conductivity. Heat of evaporation and cooling of the body. The role of water in the human body from a chemical point of view. Anion. Chemical composition water. Inorganic compounds. Lead. Negative effects of substances on the human body. Iron. Positive effects of substances. Potassium. Balance. Water standards. Water. Complex of minerals. Water purification. The role of water in the human body from a biological point of view. Amount of water. Blood. Life process. - The role of water in the human body.pptx

Mineral water

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The value of mineral water for humans. Mineral water Most often they are underground, less often - surface. Underground waters are divided into medicinal and table waters, medicinal waters and table waters. Different layers of soil serve as a kind of filter. The effects of mineral waters are very diverse and affect all organs and systems. It would seem that it could be simpler - minerals and gases dissolved in water. Otherwise, you can get the opposite effect of the healing effect. What do Bon Aqua and Borjomi have in common? Almost nothing. The second is for medical dining rooms, which should not be overdone. -

Water. Water is one of the most unique substances on Earth. Despite the rapid development modern science, scientists have not yet fully studied the nature of this seemingly simple substance! Because of its apparent simplicity, people on Earth have long considered water to be a simple, indivisible substance. And only thanks to the English scientist G. Cavendish in 1766, people learned that water is not a simple chemical element, but a compound of hydrogen and oxygen. Later, A. Lavoisier (France) proved the same thing in 1783. Water is one of the most unique substances on Earth. Despite the rapid development of modern science, scientists have not yet fully studied the nature of this seemingly simple substance! Because of its apparent simplicity, people on Earth have long considered water to be a simple, indivisible substance. And only thanks to the English scientist G. Cavendish in 1766, people learned that water is not a simple chemical element, but a compound of hydrogen and oxygen. Later, A. Lavoisier (France) proved the same thing in 1783.

Physical properties of water. Water is the only liquid on Earth for which the dependence of specific heat capacity on temperature has a minimum. This minimum is realized at a temperature of +35 0C. The specific heat capacity of water is 4180 J/(kg0C) at 0 0C. The specific heat of melting when ice transforms into a liquid state is 330 kJ/kg, the specific heat of vaporization is kJ/kg at normal pressure and temperature 100 0C. The heat capacity of water is abnormally high. To heat a certain amount of it by one degree, it is necessary to expend more energy than when heating other liquids. This results in the unique ability of water to retain heat. Water is the only liquid on Earth for which the dependence of specific heat capacity on temperature has a minimum. This minimum is realized at a temperature of +35 0C. The specific heat capacity of water is 4180 J/(kg0C) at 0 0C. The specific heat of melting when ice transforms into a liquid state is 330 kJ/kg, the specific heat of vaporization is kJ/kg at normal pressure and temperature 100 0C. The heat capacity of water is abnormally high. To heat a certain amount of it by one degree, it is necessary to expend more energy than when heating other liquids. This results in the unique ability of water to retain heat.

Unique properties of water. Japanese researcher Dr. Masaru Emoto took water from various sources, including distilled water and tap water, and sharply cooled it with liquid nitrogen, resulting in the appearance of ice crystals, which were examined under a high-frequency microscope. After conducting such a study, he found out that the ice crystals obtained from the metropolis's water supply were severely deformed and ugly, in contrast to water from mountain streams, whose crystals were so pure and beautiful that they amazed the imagination. In the following experiments, Dr. Emoto took ordinary distilled water and pasted on the test tubes with inscriptions with positive emotional wishes, for example: Thank you, love, prosperity, etc., and negative ones: you are a fool, evil, hatred, etc. After freezing, crystals with positive inscriptions became very beautiful, bright and multidimensional, and crystals from water with negative inscriptions turned into dilapidated, ugly and dark. Also, studies have shown that water that is said to be warm and good words, does not age over time, even after months, and water that is spoken with words with a negative connotation goes rotten literally in a matter of days. Japanese researcher Dr. Masaru Emoto took water from various sources, including distilled water and tap water, and sharply cooled it with liquid nitrogen, resulting in the appearance of ice crystals, which were examined under a high-frequency microscope. After conducting such a study, he found out that the ice crystals obtained from the metropolis's water supply were severely deformed and ugly, in contrast to water from mountain streams, whose crystals were so pure and beautiful that they amazed the imagination. In the following experiments, Dr. Emoto took ordinary distilled water and pasted on the test tubes with inscriptions with positive emotional wishes, for example: Thank you, love, prosperity, etc., and negative ones: you are a fool, evil, hatred, etc. After freezing, crystals with positive inscriptions became very beautiful, bright and multidimensional, and crystals from water with negative inscriptions turned into dilapidated, ugly and dark. Also, studies have shown that water that is spoken with warm and kind words does not age over time, even after months, and water that is spoken with words with a negative connotation goes rotten literally in a matter of days.

Examples. 13. Sample of Shinagawa tap water, Tokyo. 14. The same pattern after 500 XADO instructors throughout Japan simultaneously sent good thoughts to him. 15. Water taken from Lake Fujiwara before prayer. 16. Water crystal after the prayer of the Buddhist high priest Kato.

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Goals and objectives

• Develop a set of computer slides for demonstration in an 8th grade chemistry lesson
• Consider the basic physical and chemical properties of water, the composition of the water molecule
• Study additional material on the topic
• Show the importance of water in nature, for humans, the most interesting areas of application of water
• Study the material of multimedia textbooks in chemistry

Slide 3

Water in nature

Slide 4

Physical states of water

The only substance in nature that exists in three states of aggregation:

• liquid state
• solid state
• gaseous state

Slide 5

Water molecule

Each water molecule consists of two hydrogen atoms and one oxygen atom, connected by chemical bonds.

Oxygen atom + Hydrogen atoms = Water molecule

Slide 6

Physical properties of water

Aggregate states of water:

• Liquid (water)
• Solid (ice)
• Gaseous (steam)

Physical properties of water:

• colorless, tasteless, odorless, transparent
• has weak electrical conductivity
• t boil = 100 °C, t melt = 0 °C

Slide 7

Water is a solvent

Slide 8

Chemical properties of water

1. Interaction of water with active metals

• 2Na + H2O = 2NaOH + H2 (Sodium Hydroxide)
• Li + H2O = LiOH + H2
• K + H2O = KOH + H2

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2. Interaction of water with non-metals

• C + H2O = CO + H2 (Water gas)

4. Interaction of water with acid oxides

• CO2 +H2O = H2CO3 (Carbonic acid)

3. Interaction of water with basic oxides

• Na2O + H2O = 2NaOH

Slide 10

Water cycle in nature

Slide 11

The importance of water for humans

Directly in the form of free liquid (various drinks or liquid food), an average adult consumes about 1.2 liters of water per day (48% daily norm). Porridge contains up to 80% water, bread - about 50%, meat - 58-67%, fish - almost 70%, vegetables and fruits - up to 90%

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Basically, water is excreted from the body through the kidneys, on average 1.2 liters per day - or 48% of the total volume, and also through sweating (0.85 liters - 34%). Part of the water is removed from the body by breathing (0.32 l per day - about 13%) and through the intestines (0.13 l - 5%).

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Daily water requirement

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Water is fuel

The sci-fi future is slowly but surely making its way into our homes. And now you can easily buy yourself a watch that receives electricity for its work from ordinary water.

How does this miracle watch work? Inside is a converter that “extracts” electrons from liquid molecules, and works like a fuel cell for a watch. Water consumption is very small. It is reported that one refill of the tank will be enough for “several weeks” of uninterrupted operation.

Multimedia tutorial"Chemistry" 8th grade, M., Education, 2002

Educational collection 1C “Chemistry for everyone-XXI”, M., 2004

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Slide captions:

“Water... You have no taste, no color, no smell, you cannot be described - you are enjoyed. You are not just necessary for life, you are life itself. You are a deity, you are perfection, you are the greatest wealth in the world "Antoine de Saint-Exupery

Objective of the lesson: consider the distribution of water, study the composition and structure of the water molecule, physical and chemical properties, consider ecological problems associated with water pollution. Lesson topic: “Water”

1. Spread of water. Water is the most abundant mineral on Earth. Almost ¾ of the surface of the globe is covered with water, forming oceans, seas, rivers and lakes. A lot of water is in a gaseous state in the form of vapor in the atmosphere; it lies in the form of huge masses of snow and ice all year round on the tops of high mountains and in polar countries. Natural water is never completely pure. Rainwater is the purest water, while seawater contains the most impurities.

97% - sea water 3% - fresh water Glaciers 79% Groundwater 20% Rivers, lakes, atmospheric moisture 1%

Water in the human body Without water, a person can live only 3 days, while without food 30-50 days. Different human organs contain different proportions of water: Vitreous body of the eye - 99% Blood plasma - 92% Brain - gray matter 83%, white matter 70%; Kidneys - 82% Heart - 79% Lungs - 79% Muscles - 75% Spinal cord - 74.8% Skin - 72% Liver -70% Skeleton - 46% Tooth enamel - 0.2%

The world's oceans, surface waters of land and underground waters are filled with liquid water. Solid ice can be seen both in the form of snowflakes and in the form of frost. Water vapor is part of the atmosphere 2. Physical properties of water Water is a liquid, without color, taste and smell. At 0 C it turns into a solid state (ice), at 100 C it boils and turns into a gaseous state (water vapor). Water is the only substance that is found on Earth in all three states of aggregation.

3. The structure of the water molecule. H 2 O M = 18 g/mol Problem. Calculate the mass fractions of elements in water. W (H) = 11% W (O) = 89% Water is a complex substance, hydrogen oxide, molecular structure, polar covalent bond.

Structure of a water molecule. The water molecule is polar, it is a dipole O H H + -

Association of water molecules (H 2 O) x, where x = 2,3,4, etc. Due to the high polarity of molecules, water is a universal solvent; it dissolves ionic compounds and substances consisting of polar molecules well.

Water is one of the most reactive substances. + acidic oxide = acid 1.Water + basic oxide = soluble base 4. Chemical properties of water

Water - as an oxidizing agent: 2. Interacts with active (alkali and alkaline earth metals) Na + H 2 O = ? Demonstration of experience When heated, water can also interact with less active metals, such as magnesium. Mg+ H 2 O t°C ?

Water - as a reducing agent 3. Interacts with an oxidizing agent such as fluorine (water burns in fluorine). 2 F 2 +2H 2 O = 4HF+ O 2

At t= 2000 °C or with transmission electric current water decomposes into simple substances - oxygen and hydrogen 2 H 2 O 2H 2 + O 2 5. Water reacts with some salts, forming crystalline hydrates. CuSO 4 + 5 H 2 O = CuSO 4 5 H 2 O 4. Reaction of water decomposition: el. current

A minute of psychological relief. Compiling syncwine in workbooks. The syncwine will consist of 5 lines. In one word (noun) express the topic of today's lesson. Choose 2 adjectives for this word. Choose 3 verbs for this word. Compose a phrase that reflects the significance of this word. Choose a synonym for this word.

5. The water cycle in nature. Water reserves remain unchanged for billions of years because... water undergoes a constant cycle. Groundwater Water evaporation Precipitation Precipitation Water evaporation condensation

Oil pollution of the world's oceans

It's hard to imagine the area human activity, where water would not be used Hydroelectric power plant Agriculture Mechanical engineering Construction In everyday life

6. Protection of water resources. Natural water is never completely pure; it contains impurities: soluble and insoluble substances. Drinking water quality It is legally determined that drinking water, supplied to the consumer, must be organoleptically pleasant and safe for health; The content of impurities in water should not exceed the maximum permissible concentrations.

Water treatment scheme

World water consumption (in m3 per person per day)

Test answers Option -1 Option -2 2, 3, 2, 4, 4 2, 2, 4, 3, 2 The key to assessing the quality of the test: “5” - 0 errors; “4” - 1 error; “3” - 2 errors.

Conclusions: Water is the most abundant substance on Earth. Water occurs in nature in all three states of aggregation. The bond between atoms in a water molecule is polar covalent. Water has weak redox properties. Water decomposes under the influence of electric current or at t= 2000 °C.

Lesson topic. Water is the most amazing thing

substance in nature.

(8th grade)

Chemistry teacher MBOU secondary school in the village of Ir.

Prigorodny district

Tadtaeva

Fatima Ivanovna.

Lesson objectives: consider basic information about water, its structure, physical and chemical properties. The water cycle in nature, sources of its pollution. The importance of water in human life. Mineral waters of Ossetia. Strengthen interdisciplinary connections, attract material on local history to increase the cognitive activity of students.

Equipment and reagents: test tubes, glass, funnel, tweezers, water, ice, two glass bottles of water, phenolphthalein, calcium metal, copper, barium oxide, calcium oxide, copper oxide, silicon oxide.

On the students' desks: water, copper, barium oxide, calcium oxide, copper oxide, silicon oxide, phenolphthalein, test tubes.

Water is the most amazing substance in nature.

“Water, you have no taste, no color, no smell, you cannot be described, they enjoy you without knowing what you are. It’s impossible to say what is necessary for life: you are life itself... You are the greatest wealth in the world..."

Antoine de Saint-Exupery

Water is the most extraordinary substance in the world.

It exists in every corner of the universe. Among the planets solar system water is distributed very unevenly.

There is a lot of water on Venus

little and she is in

gaseous state .

Planet Venus

Planet Earth .

Everything on Mars is small

volume of water - ice.

Only on Earth is the kingdom -

liquid water.

The planet Mars

Water is a true miracle of nature .

• The structure of a water molecule.

It consists of two hydrogen atoms

and one oxygen atom .

Water in gaseous state

The Earth has a continuous

« water » shell hydrosphere ,

which water forms

three-state .

Water in liquid state.

Solid water

Hard water.

• IN natural conditions On Earth, solid water is found over vast areas - this is snow and ice.

Unique properties of water in the solid state.

It is lighter than liquid water.

Can evaporate even

negative temperatures .

When it freezes it expands .

Solid precipitation.

Snowflake shapes

Snow is one of the most

common

crystals on earth

Frost

frost

Ice grains

hail

Ice on land and water

Glacier in Antarctica

Iceberg -

This is continental ice

sliding into the sea and

ice-forming

floating island

Glacier in Greenland

Mountain glaciers

Business card water.

Water formula

Substance simple or complex

Type of chemical bond

Lattice type

Boiling point of water

Chemical properties of water

1. Interaction of water with metals.

Electrochemical voltage series of metals

Li,K,Ba,Ca,Na,Mg,Al, Mn,Zn,Cr,Fe,Sn,Pb, H 2 , Cu,Hg,Ag,Au

Me ( Li,K,Ba,Ca,Na,Mg,Al ) + N 2 O = Me(OH) n + N 2

Me ( Mn,Zn,Cr,Fe,Sn,Pb ) + N 2 O = MeO + H 2

Me ( Cu,Hg,Ag,Au ) + N 2 O ≠

Remember!

3Fe+4 N 2 ABOUT = FeO∙Fe 2 O 3 (Fe 3 O 4 ) + 4H 2

Exercise. Complete the equations

1) K + N 2 O =

2 ) Zn+ N 2 ABOUT =

3 ) Cu+ N 2 ABOUT =

2 . alkali and alkaline earth metals with the formation of bases (alkalis):

MeO + N 2 O = Me(OH) n

Exercise. Complete the equations possible chemical reactions:

1) BaO + H 2 O =

• TO 2 O+H 2 O =
• WITH uO + N 2 O =
• ZnO + N 2 O =

3. Water interacts with oxides non-metals with the formation of acids: NeMeO + N 2 O → acid

Remember! Exception SiO 2

"Acid Rain"

Exercise. Complete the equations possible chemical reactions:

1)SO 3 + N 2 ABOUT =

2) SO 2 + N 2 O =

3) SiO 2 + N 2 ABOUT =

4 . Water under the influence direct current decomposes

N 2 O =

A person can live without water for a maximum of 7 days.

Water under a microscope

The human body is “filled with water.” For example, in

In the body of a person weighing 70 kg, water is 49 kg.

Water is of great importance for hygiene. Origin of the word " hygiene» associated with the name ancient greek goddess Hygiei. She was depicted as a woman feeding a snake from a bowl. This is where one of the symbols comes from medicine- a bowl with a snake.

Human use of water

• There is nothing more precious in the world than wonderful, ordinary, clean water.

At home

Water

transport

Artesian

well

For food

Recreation areas

Tidal

power plants

Irrigation of fields

On industrial

enterprises

Geothermal

stations

Water can bring not only benefits but also harm Elements of the hydrosphere

WITH waters of the World Ocean

there are also many dangerous

and sometimes catastrophic

for human phenomena.

Sat down

(mud-stone flows)

Tsunami

(wave progress)

Flooding

Floods

When ice and snow are dangerous

• Solid water can be very dangerous. This is water - falling, falling, floating, thawing.

Avalanches of snow and ice are dangerous,

falling from the steep

mountain slopes

Icebergs that lead to

to shipwrecks

Huge icicles are dangerous

falling from the roofs of houses

Multi-meter thick layers are dangerous

very loose snow, in

where you can drown

Breaking through is dangerous

ice on ponds underfoot

Heavy garlands of frost are dangerous,

breaking electrical wires

Do you understand how much wealth you own?

Then learn to protect him. There is a threat hanging over the water - pollution .

Save water!

Take care of these lands, these waters,

Loving even a small epic,

Take care of all animals within nature,

Kill only the beasts within yourself.