Presentation templates for teacher certification. "Teacher portfolio" technology. The last block - but very important! Reflection 

1. Organizing time. Motivation for learning activities.(5 minutes)

Checking homework.

We welcome all guests. You can watch a lesson about the world around you.

The more active and organized we work, the more interesting things I can show and tell you. Want to know more? Then let's work!

What has existed for millions of years, is the basis of life on earth, is used by humans and has not yet ended? (water)

Let's remember the properties of water and how people use them. (Front):

What is the name of the water layer of the earth?

What role does water play in the life of living organisms?

Name the main properties of water.

Formulate the law of communicating vessels. Where did people learn to use it?

Why does a nut dipped in water stretch the rubber band less than a nut suspended in the air?

Where does a person use the buoyant property of water?

What property of water is used in washing?

What happens to a tin can if you heat it without opening it?

What property of water is used in a steam engine?

Name the three states of water. Give examples of them in nature.

Individually on cards:

Use arrows to connect the properties of water and how to use them.

Fluidity Steam engine

Has buoyant force Sweetening food

Property of communicating vessels Water wheel, power plant turbine

Expands when heated Invention of ships

Solvent Water Pipe

2. Updating knowledge, fixing difficulties, setting lesson goals.

Building a project to get out of a problem(3 minutes)

What else has existed for millions of years, been used by humans and has not yet ended? (air)

Try to formulate the topic of today's lesson from my question and the previous topic.

Subject: How a person uses air and the properties of air.

Actually, today’s topic is the main question that we have to answer. Can you immediately give a complete, detailed answer?

What will be the objectives of the lesson?

Lesson objectives: 1) Find out (repeat) what air is and its use.

2) Find out (repeat) the properties of air and their use by humans.

Which one would you suggest? work plan over the topic?

1) Remember what we know

2) Experiments, observations - summary table

3. Implementation of a project to get out of a problem (7 minutes)

- Let's remember what we know:

What is the name of the air shell of the Earth? (atmosphere)

What is air? (mixture of gases)

Would life on Earth be possible without this air envelope? Why?

How do animals and plants use air? (all living organisms breathe using oxygen in the air)

How do plants eat? (plants use carbon dioxide in the air during photosynthesis to create organic matter and release oxygen)

Why can't organisms live even 5 minutes without air? (air cannot be stored for future use)

What other role does the earth's atmosphere play? (the atmosphere protects the Earth’s surface from overheating and hypothermia; thanks to the ozone layer, it protects from harmful ultraviolet rays).

What properties of air do you already know? (tasteless, colorless, odorless)

Suggest how we can verify that air exists and is not empty space? Is it still possible to feel, touch, see it? Look at the objects presented on my table (fan, container with water and an empty glass, an empty bag). Suggest how they can be used in proof.

Experience 1.

Wave a fan (notebook) in front of your face. How did you feel? (touch)

Test touch, air movement using the tools at hand that everyone has on their desk? (wave notebook) - felt

- When moving, the air is tangible.

Experience 2.

Place the glass turned upside down into a container of water.

Why doesn't water get into the glass? (there is air - an air bell)

I'll tilt the glass a little. What happened? (air in the form of bubbles came out of the glass and rose above the surface of the water)

Experience 3.

Catch in empty plastic bag air.

So, the conclusion: air is a gas, it surrounds us...everywhere. Air does not have a constant shape and tends to fill the entire volume available to it.

Remember your first experience with a fan. What is wind? (wind is the movement of air)

Think about how a person can force the wind to help him?

(the wind inflates the sails - already 2-3 thousand years ago the Egyptians sailed the Mediterranean Sea on quite advanced sailing ships, windmills, wind engines of power plants are the cleanest way to generate electricity)

- table

Open textbook on page 89. The illustrations show the use of wind power by man.

Who remembers: how the wind arises? (wind moves from less warm areas to warmer ones.

Remember your observations how have you ever sat by the fire. What does warm air from a fire do to light ash particles? (lifts them up)

Consequently, warm air rises and moves from a less heated area to a more heated one.

Remember where batteries and vents are installed in our premises, why? (at the bottom so that warm air is evenly distributed throughout the entire room)

We talked about the behavior of warm and cold air. What property of air is this related to, what happens to air when heated and cooled?

(when heated it expands, when cooled it contracts)

Experience 2.

Observe another experiment confirming this property. Vika conducted and recorded it at home due to limited time during the lesson.

On plastic bottle, inside of which there is air, we put on a ball. First, we immersed the structure in a basin of hot water. After some time, and quite a long time, the ball began to inflate. This means that the air did not fit in the bottle, it expanded when heated and began to inflate the balloon. Then we lowered our structure into a basin of cold water. Gradually, the ball began to deflate - it began to have enough space in the bottle. This means that when air cools, it compresses.

Conclusion: Air expands when heated and it becomes easier, rises. When cooled, it contracts, becomes heavier and sinks down. - table

Who can guess how else people learned to use the property of warm air to rise upward? (Balloons) - table

Remember what force pushes a log out of the water? Think about why balloons filled with hydrogen fly into the sky. What force causes objects lighter than air to rise?

(buoyant force) –table

The beginning of the era of aeronautics can be considered in 1783, when the Montgolfier brothers took to the skies in a hot air balloon. However main drawback balloon - its poor controllability. At the end of the 19th century, inventors designed aircraft that could move using propeller, driven by a motor. These were airships filled with hydrogen. They were enormous in size. For example, the airship built by the German inventor von Zeppelin was 128 m long and almost 12 m wide. But the future lay with a different type aircraft

Experience 3.

Throw a piece of paper into the water.

Why did the leaf not remain hanging in the air, but lie on the surface of the water?

(air is a less dense substance, low density) –table

Is it possible to lean on the water? Under what conditions? Guess whether it is possible to lean on the air, under what conditions?

(increase the support area, reduce weight, develop greater speed)

But the resistance to movement in the air is minimal, so the speed of movement in the air becomes less limited.

How do you think man learned to use low air density? (airplanes, helicopters, missiles - moving long distances with high speed)

The emergence of aviation became possible when the power of engines and, at the same time, the ease of materials for construction reached a certain level. The first airplane powered by the Wright brothers took off in 1903. People have learned to use the airspace itself.

Look at the illustrations on page 90: What are these aircraft called?

Use yours life experience, guess. How can my blouse be related to the topic of the lesson?

(air is a poor conductor of heat - low thermal conductivity) –table

Which statement do you think is correct: clothes warm the body, or clothes heat up from the body?

Due to its low density, air is a poor conductor of heat. When it’s cold, animals raise their fur, birds raise their feathers, and a person puts on a knitted blouse. Woolen items, down jackets, fur coats create between the body and external environment thick air layer. which prevents the body from losing heat. Table - woolen items.

Where else does a person use the low thermal conductivity of air? (stand by the window)

(double window frames in houses, the air between them allows you to keep heat in the houses) - table

The textbook invites us to get acquainted with another property of air and

To do this, carry out the following experiment:

Experience 4.(child conducts at the blackboard)

Let's take a plastic syringe without a needle and put the piston in the middle position. Holding the hole for the needle with your finger, we will try to compress and stretch the air. Draw a conclusion.

(Conclusion: With force, air can be compressed and stretched, but it tends to maintain its original volume.)

This property is called - elasticity –table.

Where can the elasticity of pumped air be used?

(inflatable mattresses, car tires, balls) -table

So, look at the summary table of the use of air properties that we have obtained.

To this table I want to add that people have learned to use not only the properties of air, but also the gases that make up its composition.

- Look at the diagram to see what other gases, besides those mentioned today, oxygen and carbon dioxide, are included in the air.

Work in groups.

The textbook does not offer us ways to use the gases that make up the air. Try it yourself. Open your notebooks to page 35. Turn around and form groups of fours. Discuss your assumptions. Signal when ready.

Let's add to the table. How does a person use the gases that make up the air?

Nitrogen – nitrogen fertilizers

Oxygen – used for welding

Carbon dioxide is added to water to create carbonation.

Balloons are filled with hydrogen

Let's draw conclusions: what has a person learned and used about air?

(wind strength, air properties and composition)

5. Primary consolidation in external speech. Inclusion in the knowledge system.

(2 minutes)

To check how you have mastered the material, I suggest answering my questions by playing the game “What would happen on Earth if the air... was not elastic?

If air didn't move, would there be no wind?

What if there was no carbon dioxide in the air?

What if the air were denser than it is?

What if there was no oxygen in the air?

What property of air is most important for a ball? Blankets? A balloon? Airplane? Parachute?

What gas, which is part of the air, maintains combustion in a furnace and maintains our body temperature? (oxygen, when burned, energy and heat are generated that maintain the temperature of the body and the furnace)

Working in a notebook(subject to time availability)

I invite you to reflect and express your point of view:

Name objects that benefit from air density (the more, the better) -

parachute, plane, air mattress, ball, balloons

Name objects that are hindered by air density (the lower it is, the better) - sailboat, sweater, airplane, rocket

6. Independent work with verification against the standard. (3 minutes)

Work in a notebook. Page 34. No. 2

Write what properties of air are used

Check your work against the standard.

Who did it without errors?

Who had difficulties, what are your next steps? (read carefully, understand the textbook material at home)

7. Reflection on educational activities.(3 minutes)

The lesson is coming to an end. Let's summarize.

What was the purpose of today's lesson? (Find out how a person uses air)

Have you achieved your goals? Prove:

What other properties of air have people learned to use? (airspace, wind force, air components)

What properties of air do you remember?

Who is happy with the lesson and with themselves in the lesson?

Who else had problems with my questions? - work carefully at home

Who is very pleased with both the lesson and themselves?

Thank you for the lesson. Thank you for your attention.

Or a quick survey:

What is air?

What gases are included in air?

Does air have a certain shape and volume?

What is the air shell of the earth called?

What did people use in ancient times to travel on sailboats across the seas?

What does air do when heated?

Why don't planes crash? Helicopters

What property of air is used in air mattresses, balls

What gas is used in the production of soda?

How long can a person live without air?

There is a lot of air on earth, there is enough for everyone, there is no need to worry about it

Experiment 6. Air has weight, mass.

I'll take 2 identical balls. One of the balloons is inflated with air, the other is not. Both balls are tied to the ends of the sticks. I will place the stick with the uninflated balloon on the edge of the table so that it is in balance. I will mark the intersection with the table. I’ll put a stick with an inflated balloon in the same way. What happened? (the inflated balloon with air outweighed)

- Therefore?...(air has weight, mass)

- If air has weight, it means it presses on the Earth.

- The wind blows from the area high pressure to an area of ​​low pressure (if you are under pressure, you want to run away, go to an area of ​​​​less strong pressure). An area of ​​high pressure is usually found in an area with cold air masses, and low - with warm ones.

The world

Topic: How a person uses the properties of air.
Goal: To form a concept about air and its properties.

Equipment: cassette No. 1 “The role of air in our lives, air consumption”,
cassette No. 2 “Water, air, gases, oxygen”
illustration about ways to use air.

I. Statement of the problem and updating of knowledge.

Today we will talk about air and its properties.
- Let's look at the questions at the beginning of the paragraph.

1. In what ways can you prove that air is not empty space?
Answer: It is necessary to demonstrate its presence.
a) To do this, you need to wave a fan in front of your face. We will feel the touch, although the fan has not touched us. This means that there is some kind of body between the fan and the face. This is air.
B. Turn the glass upside down and slowly lower it into a jar of water.
- Does water get into the glass? Why?
Answer: It doesn't hit. Air is obstructed.

2. What is the name of the air shell of the Earth?
Answer: The air envelope of the Earth is called the atmosphere.

3. How do animals and plants use air?
Answer: All living organisms breathe using oxygen in the air.
Plants use air to absorb carbon dioxide, which they use in photosynthesis and release oxygen.

The air forms an air shell that surrounds the globe and, with the help of the ozone layer, protects the Earth's surface from harmful ultraviolet radiation.
Read task 1 on p. 24
And what to do with task 1 on p. 24 let's watch a fragment of the film "Water". (2 minutes.)

Answer: The water of the oceans evaporates and is carried in the form of clouds by winds to other places where rain falls and rivers are fed.
- How does the wind arise?
Answer: Areas of the earth's surface heat up differently: the wind blows from a less heated area to a more heated one.

Man has long learned to use it as a source of energy.
He invented a sail that allowed him to travel.
Already 2-3 thousand years ago, the Egyptians sailed the Mediterranean Sea on quite advanced sailing ships.
In the Middle Ages, wind wheels were built for household work.
However, even in modern times, the wind engine plays an increasingly important role, since, unlike other sources, it does not pollute the atmosphere.
One way to travel through the air is a balloon filled with lighter-than-air gas or simply heated air. The beginning of the era of aeronautics should be considered the year 183, when the Montgolfier brothers took to the air in a hot air balloon.
The ability of aircraft to move through the air is due to the fact that air has a buoyant force.
Read about this in the material for the curious. With. 25.
- So what power does air have?
If a body turns out to be lighter than air, then it can fly. Air expands when heated. This makes it lighter than air and rises.
- So what happens to air when heated?
However, the main disadvantage of the balloon is its poor controllability.
Only airplanes provided people with the opportunity to travel long distances at high speed.
- Read the text about this on p. 26.
- What other property of air did you learn about?
(It has low density.)
- Due to the low density of air, it has another property: it conducts heat poorly. The creation of warm things by humans is based on this property. Woolen items and fur coats retain a thick layer of air, which prevents the body from losing heat.

2nd task on p. 26.
Cross out the incorrect statement:
. Clothing heats up from the body.
. Clothes heat up the body.

Physical exercise.
- To get acquainted with another property of air, let’s carry out the experiment that was offered to us in the 3rd task (p. 26).
- What is the conclusion? (p. 27).
- What is the name of this property?
Answer: This property is called elasticity.

The use of air in car tires, balls, and air mattresses is based on this property.
- Let's repeat what properties of air you learned about?
Air properties:
- expands when heated,
- conducts heat poorly
- low density,
- elasticity.

Air is a mixture of gases: nitrogen, oxygen, carbon dioxide and others.
The air contains:
21% oxygen
78% nitrogen
0.9% noble gases and
0.03% carbon dioxide,
In addition, hydrogen is contained in small quantities.
- Watch a fragment of the film “Composition of Air”. "Gases." "Oxygen" (6 min.)
- What gases does air consist of?

4. Now let’s look at the questions at the end of the paragraph on page 28.
- What properties of air are most important for a ball, blanket and parachute?
For the ball - elasticity,
for a blanket - poor heat conduction,
for a parachute - density.

Where do the substances that make up living organisms come from?
What kind of air gas creates the basis of all organic substances?
Answers: Living organisms consist of organic matter. Plants create organic matter from carbon dioxide and water.
Therefore, the main gas that makes up the bodies of living organisms is carbon dioxide.

Which air gas maintains our body temperature and the temperature in the oven?
How?
Answers: Our body’s high temperature is maintained by the heat generated by the oxidation of food. This is made possible thanks to oxygen. Oxygen also ensures the combustion of wood in the stove.

Task 4,5,6.

Task 7.
- Which drawing will you not color? (Rocket)

Task 8.
In order for the wind wheel to catch even a weak breeze and increase the carrying capacity of the parachute and glider, it is necessary to increase the support area and reduce the weight.

Task 9.
Fertilizers are made from nitrogen.
Oxygen is used for welding.
Carbon dioxide is added to sparkling water.
Balloons are filled with hydrogen.

Task 10.
- What force lifts balloons into the air?
Balloons are lifted by buoyant force.

Bottom line. - What new did you learn in the lesson?
- How does a person use the properties of air?

At home: Paragraph 20, task 4 and 8.

home » Investments » Presentation templates for teacher certification. "Teacher portfolio" technology. The last block - but very important! Reflection 