【黑龙江】英文配音文案—解说词

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

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 _________.

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 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

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.

Oxygen is slightly soluble in water.

The molecular formula for hydrogen peroxide is _________.

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:简介

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

Level 1: Perform the experiment according to the instructions given.

To select the required apparatus or chemicals, click on the respective button. For every correct selection of apparatus and chemicals, you will get 2 marks and for every correct reaction you will get 3 marks.

Click on the conical flask to place it on the stand.

Click on the MnO2 bottle to introduce the catalyst into the conical flask.

Close the flask with a two holed cork.

Click on the thistle funnel.

Click on the bent tube.

Add H2O2 to the thistle funnel by clicking on its bottle.

Click on the tap of the thistle funnel to add H2O2 drop by drop into the conical flask.

Drag the correct options and place them into the boxes. Balance the reaction with minimum possible coefficients and click on 'Check' button.

Click on ‘Retry’ button to correct your answer.

Click on ‘Next’ Button.

Click on the correct option.

Click on the particular question number for additional information.

To select the required apparatus or chemicals, click on the respective button.

You need to practice Level 1.

This is not the required apparatus.

You get 5 questions to answer in 25 seconds. Click on the correct option and then the ‘Next’ button. You get 5 points for every correct answer and lose 2 points for every wrong answer. Your time starts as soon as you click on ‘OK’ button.

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