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0:00

Чем различаются физические и химические явления?

1:18

Опыт "Разложение малахита"

2:32

Опыт "Горение магния"

3:10

Опыт "Химическая реакция раствора соды и сульфата меди (II)"

4:03

Опыт "Растворение осадка гидроксида меди (II) в уксусной кислоте"

4:38

Запах как признак химической реакции

5:03

Важнейшие признаки протекания химических реакций

5:35

Условия, необходимые для протекания химических реакций

6:20

Задание 4 (Параграф 12)

7:27

Задание 8 (Параграф 12)

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00:00:02

interesting lesson topic: signs of

00:00:04

chemical reactions, and what is a

00:00:06

chemical reaction, back in the very first

00:00:09

lesson, we looked in detail at how the

00:00:12

physical and chemical

00:00:14

properties of substances differ, and so, depending

00:00:16

on what properties of the substance

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such things change and phenomena occur with

00:00:22

these substances, if a substance passes

00:00:25

from one state of aggregation to another

00:00:28

or changes its external form, then this

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process is called a physical phenomenon, an

00:00:34

example could be the boiling or

00:00:37

freezing of water, the melting of a metal, the

00:00:39

evaporation of gasoline and the bending of a wire,

00:00:42

please note that during physical

00:00:45

phenomena nothing happens to the substance itself,

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its chemical form remains

00:00:51

unchanged, but if a substance

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turns into another completely new

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substance, then this process will already be

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called a chemical phenomenon or a

00:01:02

chemical reaction; evidence

00:01:06

that a chemical reaction is taking place

00:01:08

can serve as certain signs;

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there may be signs; let’s

00:01:13

look at examples of specific

00:01:16

chemical reactions; there is malachite in a test tube;

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green colored substance with

00:01:21

the chemical formula

00:01:23

cuprum yours twice co3 let's use a

00:01:26

spirit lamp to heat the malachite powder and

00:01:30

look carefully at the

00:01:32

changes that occur, first heat the

00:01:36

entire surface of the test tube and then

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begin to heat the

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substance itself what you are observing malachite

00:01:45

begins to change its color from green

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to black this is a new one being formed the substance is a

00:01:51

hoax,

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besides this, on the surface of the powder you

00:01:57

should notice the

00:01:58

formation of a mini volcano of which

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are formed due to the release of gases, this is

00:02:04

carbon dioxide co2 and water vapor, water vapor comes

00:02:09

into contact with the cold surface of

00:02:11

the test tube and turns

00:02:13

into a liquid state and you see

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transparent droplets of water,

00:02:17

let's look again to malachite before

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the reaction and what happened to it after the

00:02:23

reaction and draw a conclusion the most

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noticeable sign of this chemical

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reaction is a change in color the

00:02:31

next reaction in front of you is

00:02:34

magnesium shavings magnesium is a

00:02:36

silver-white metal let’s carry out the

00:02:39

combustion reaction of magnesium in air and look at the

00:02:43

signs of this reaction magnesium burns with a very

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bright and burning flame, the temperature

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of which can reach two thousand 200

00:02:54

degrees. As a result of combustion, magnesium

00:02:58

turns into a new white substance,

00:03:01

magnesium. The signs of this reaction

00:03:05

are the emission of light and the release of

00:03:08

heat. We move on to the next chemical

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reaction. In two test tubes there are

00:03:14

aqueous solutions of the following substances:

00:03:17

soda on 323 and copper sulfate 2 cube ram

00:03:22

so4 you see that the soda solution is a transparent,

00:03:26

colorless solution of copper sulfate 2 is

00:03:28

blue and now we mix two

00:03:32

solutions with these substances what you

00:03:37

observe is that first a

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precipitate is formed a color change on the

00:03:42

lighter one and in addition, if you

00:03:44

look closely you can

00:03:47

see the release of gas bubbles, that is,

00:03:50

in this chemical reaction

00:03:53

three signs can be observed at once: the

00:03:55

formation of a precipitate, a change in color,

00:03:59

the release of gas, but that’s not all,

00:04:02

look what happens if you

00:04:05

add a solution of acetic acid to the resulting precipitate,

00:04:13

the precipitate gradually dissolves and this is also a sign of

00:04:17

the reaction,

00:04:34

there is another a sign of reactions

00:04:37

that cannot be shown and

00:04:39

conveyed to you using a video, and this sign

00:04:42

is the appearance of a specific odor

00:04:44

during the reaction, for example, when

00:04:47

sulfur burns,

00:04:48

Su-2 gas is formed, which has a sharp

00:04:52

and unpleasant odor; with such substances you

00:04:54

need to be extremely careful and work

00:04:57

under special fume hoods.

00:05:00

Now let's summarize and once again

00:05:03

list the most important signs of the occurrence of

00:05:05

chemical reactions: color change,

00:05:08

light emission, heat release,

00:05:12

formation of a precipitate, disappearance of the precipitate,

00:05:16

release of gas, appearance of an odor, however, I

00:05:20

draw your attention to the fact that in

00:05:22

some cases a chemical reaction

00:05:24

occurs,

00:05:25

but you will not notice characteristic signs

00:05:28

with such reactions. also

00:05:29

get acquainted with further study of

00:05:31

chemistry, now let's think about what

00:05:35

conditions need to be created for a chemical

00:05:38

reaction to begin to occur.

00:05:39

Perhaps the most important condition for the

00:05:42

occurrence of a chemical reaction between

00:05:44

substances is contact or

00:05:47

contact of substances with each other, and the

00:05:50

smaller the particle size of a solid substance,

00:05:53

the faster it will proceed, therefore

00:05:56

solids substances are pre-

00:05:58

crushed, often to start a reaction,

00:06:01

the substance needs to be heated, this mainly

00:06:04

concerns combustion reactions of substances, and

00:06:06

there are reactions that begin

00:06:08

to occur only in the presence of lighting, for

00:06:11

example,

00:06:13

the process of photosynthesis, which you know from biology, we will answer some

00:06:16

questions at the end of the paragraph, question number 4,

00:06:19

which phenomenon is physical or chemical

00:06:22

refers to the evaporation of alcohol, this is a transition

00:06:26

from a liquid state of aggregation to a

00:06:29

gaseous state, which means the physical process of

00:06:32

burning gasoline, the combustion of any substance,

00:06:34

this is a chemical process, remember this is the

00:06:38

melting of sugar when heated,

00:06:40

melting

00:06:41

is a transition from a solid to a

00:06:43

liquid state, therefore I am

00:06:45

not in physical darkening of a copper

00:06:47

plate

00:06:48

in the flame of an alcohol lamp, a copper plate

00:06:51

interacts with oxygen in the

00:06:53

air and a

00:06:55

new black substance is formed on its surface,

00:06:58

therefore this is a chemical phenomenon when

00:07:01

writing milk when writing milk, a

00:07:04

characteristic odor appears,

00:07:06

gas is released and new substances are also formed,

00:07:10

therefore this is a chemical process of rotting

00:07:12

meat, when rotting, an

00:07:15

unpleasant specific smell also appears a

00:07:17

color change occurs,

00:07:20

new substances are formed,

00:07:21

therefore this is also a chemical process,

00:07:24

question number 8 to remove rust from

00:07:27

iron products, they are dipped into a burning

00:07:30

aqueous solution of citric acid,

00:07:32

after a while the rust disappears

00:07:35

and the liquid turns yellow,

00:07:37

what is the physical or chemical phenomenon of the

00:07:40

described process rust is a

00:07:43

red compound or brown in color,

00:07:45

if you lower a rusty nail into a glass of

00:07:48

water, then nothing will happen, but if you

00:07:50

lower a rusty nail into a colorless

00:07:52

solution of citric acid or acetic

00:07:54

acid,

00:07:55

then after a while the rust

00:07:57

will dissolve from its surface, which

00:07:59

indicates a chemical reaction is taking place,

00:08:01

in addition, the acid solution will turn

00:08:04

yellow

00:08:05

which is also a sign of a chemical

00:08:07

reaction, well, today our lesson

00:08:10

has come to an end, I hope you

00:08:12

remember the signs of chemical reactions well,

00:08:15

because in the next lesson

00:08:17

you will have your third

00:08:18

practical work,

00:08:20

so see you

Description:

В этом уроке мы рассмотрим признаки химических реакций и условия для их протекания. Ссылка на учебник 7 класса: http://e-padruchnik.adu.by/ Таймкоды: 00:00 | Чем различаются физические и химические явления? 01:18 | Опыт "Разложение малахита" 02:32 | Опыт "Горение магния" 03:10 | Опыт "Химическая реакция раствора соды и сульфата меди (II)" 04:03 | Опыт "Растворение осадка гидроксида меди (II) в уксусной кислоте" 04:38 | Запах как признак химической реакции 05:03 | Важнейшие признаки протекания химических реакций 05:35 | Условия, необходимые для протекания химических реакций 06:20 | Задание 4 (Параграф 12) 07:27 | Задание 8 (Параграф 12) #признакихимическихреакций, #выделениегаза, # выпадениеосадка, #растворениеосадка, #выделениетеплоты, #излучениесвета, #условияпротеканияреакций

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