【四川】英文配音英文版用过氧化氢制备氧气实验配音文案—解说词

英文配音英文版用过氧化氢制备氧气实验配音文案

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The experimental set up has a conical flask containing manganese dioxide, which acts as a catalyst. The thistle funnel is fitted to this flask. The thistle funnel is filled with hydrogen peroxide. The delivery tube leads to an inverted gas jar, placed over a trough of water. 

Now, allow hydrogen peroxide to be added dropwise into manganese dioxide. Two molecules of hydrogen peroxide, in the presence of a catalyst, manganese dioxide, break up into two molecules of water and release a molecule of oxygen. The released oxygen gas passes through the delivery tube, then over water and starts getting collected in the gas jar. This method of collection of gas is called the downward displacement of water.

Two molecules of hydrogen peroxide in the presence of a catalyst, manganese dioxide give two molecules of water and release a molecule of oxygen.

Conical flask

Manganese dioxide

Thistle funnel

Hydrogen peroxide

Gas jar

Trough

Water

Gas

O2 Gas

Downward displacement of water

Briefly describes the preparation and properties of oxygen gas.

Discusses the natural occurrence and preparation of oxygen.

Displays a schematic representation of the shell structure of oxygen.

Describes the method of preparation of oxygen from hydrogen peroxide.

Discusses in short various methods of preparation of oxygen and lists its properties and uses.

E05900022_041

Two molecules of hydrogen peroxide in the presence of manganese dioxide give 

water

oxygen

both oxygen and water  

oxygen and hydrogen

Hydrogen peroxide decomposes to give oxygen and water in the presence of manganese dioxide (catalyst).

The oxygen gas formed by the decomposition of hydrogen peroxide is collected by ___________.

the upward displacement of water

the downward displacement of water  

the decantation of water

the filtration of water

Oxygen is slightly soluble in water. Hence, it is collected by the downward displacement of water.

_________ acts as a catalyst during preparation of oxygen from hydrogen peroxide.

Carbon dioxide

Manganese dioxide

Iron

Chromium

Manganese dioxide provides the site for hydrogen peroxide molecules to react.

Production of oxygen from hydrogen peroxide is a type of _________ reaction.

combination

neutralization

decomposition

None of the above

As hydrogen peroxide breaks into oxygen and water in the presence of manganese dioxide catalyst, it is a type of decomposition reaction.

State whether the following statement is true or false.  Oxygen is completely soluble in water.

True

False

Oxygen is slightly soluble in water.

The molecular formula for hydrogen peroxide is _________._________。

H2 OHH2 OH

H2 OH2 O

O2 HO2 H

None of the above

The molecular formula of hydrogen peroxide is H2 O2 .

Complete the following reaction.  2H2 O2  → ______________________

H2 O + O2 H2 O + O2 

2H2 O + O2 2H2 O + O2 

2H2 O + 2O2 2H2 O + 2O2 

H2 O + 2O2 H2 O + 2O2 

2H2 O2  → 2H2 O + O2 2H2 O2  → 2H2 O + O2 

E05900022_051

Lab Preparation of Oxygen

Introduction:

In this simulation, you will learn how oxygen can be prepared in the laboratory from H2O2, using MnO2 as catalyst.

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