Download "36. Водород. Физические свойства"

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60. Амины (часть 5) + задачи с ЕГЭ 2021

60. Амины (часть 5) + задачи с ЕГЭ 2021

Channel: Птичка Химичка -Химия с Нуля-

химия с нуля

егэ по химии

огэ по химии

химия на отлично

школьная химия

водород

физические свойства водорода

растворимость водорода

методы сбора водорода

определение водорода

химияснуля,

егэхимия,

огэхимия,

химиянаотлично,

водород,

физическиесвойстваводорода,

методопределенияводорода

00:00:02

physical properties of hydrogen, at the beginning

00:00:04

let's talk about hydrogen as a chemical

00:00:06

element

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the symbol of the element of hydrogen is the letter h

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hydrogen is placed in the first period of the first

00:00:14

group the atomic number of the element is one

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relative atomic mass

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is rounded also 1 and hydrogen has a

00:00:24

constant valence value equal to

00:00:27

one

00:00:29

atomic number of the element indicates to us the

00:00:32

charge of the nucleus of an atom of a given element and the

00:00:35

number of electrons that rotate

00:00:38

around the nucleus, so the serial number of the

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element hydrogen is equal to one, tells

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us that the charge of the nucleus of a hydrogen atom is equal to

00:00:45

plus one and a single electron rotates around this nucleus,

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also we already

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know that hydrogen is non-metallic

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element non-metallic elements

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form substances non-metals

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hydrogen forms just one simple

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substance hydrogen gas with the formula h2 and

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of course hydrogen gas is not a

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metal hydrogen is the most

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common element in the universe

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if oxygen is the most common

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element on earth then hydrogen is the most

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common element in the universe the

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share of hydrogen is plus minus 92 percent and

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only eight percent in outer

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space remains for all other

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elements hydrogen as a simple substance with the

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formula h2

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is a gas without color, taste and smell, the

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condensation temperature of hydrogen, that is, the

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temperature of transition from the gaseous to the

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liquid state is equal to minus two hundred and

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fifty-three degrees hydrogen is one of the

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most difficult gases to burn, also the

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solubility of hydrogen in water is low,

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only 19 grams of hydrogen are dissolved in

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one liter of water, and we remember that gases

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that do not dissolve or

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dissolve little in water can be subsequently

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collected by the method of displacing water, which

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happens in this case through a gas outlet

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tube the gas enters the test tube

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filled with water gradually the gas displaces the water from the

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test tube Ryazan

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white the entire volume of the test tube this is

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only possible for insoluble or slightly

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soluble gases in water,

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we also know the second method of collecting gases by

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displacing air, here we need to take into account

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the mass of the gas that is collected, the

00:02:29

painting mass of air is 29 grams per

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mole you need to know it by heart the mass of

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hydrogen and you can calculate it is

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2 grams per mole

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hydrogen is the lightest gas, 14 and a

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half times lighter than air, so the gases

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that are lighter than air are collected

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in a test tube turned upside down and the gas is

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light and it will rise up,

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gradually displacing air from the test tube,

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oxygen has a mass of 32 grams per

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mole of paint, so we

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collected oxygen in the test tube in the usual position,

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bottom down, now we will listen to two sounds, we

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will be more interested in the second

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sound in a dull clap, this is the characteristic

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sound of determining hydrogen if

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we determined oxygen by introducing the smoldering rays

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were taught to flash brightly and we understood

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that we were dealing with oxygen; hydrogen

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cannot be determined in this way

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because hydrogen does not support combustion;

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hydrogen is determined by setting it on fire; if at the

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same time a dull pop is heard, then we are

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dealing with hydrogen, but it is very important

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to set fire to pure hydrogen without

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impurities of oxygen and air because a

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mixture of two volumes of hydrogen and one

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volume of oxygen is called detonating

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gas and the mixture, in principle, in other

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ratios of these two gases of hydrogen and

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oxygen is also explosive,

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you need to remember what detonating

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gas is, it is an explosive mixture of two volumes of

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hydrogen and one volume oxygen,

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so now we will hear the first sound, this is

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just the sound of a small explosion

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because we ignited hydrogen with

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contaminated oxygen air, and the second

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sound will be the characteristic sound of the

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combustion of pure hydrogen, a dull

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bang, listen and remember

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Kaplan, do not bring the test tube to the right of

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hydrogen, an explosion occurs,

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accompanied with a barking sound, hydrogen

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contains oxygen, we bring oxygen to the flame, the

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second sample of hydrogen occurs in a

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dull bang, pure hydrogen, well,

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today, in principle, we have sorted out all the basic

00:04:49

physical properties of hydrogen that you

00:04:51

need to know,

00:04:53

don’t forget to like, be sure to

00:04:55

subscribe to the channel and ask questions

00:04:57

in the comments

Description:

В этом уроке ты узнаешь основные физические свойства водорода и метод его определения. ссылка на ролик https://www.youtube.com/watch?v=iPvEJslenHI

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