英文配音英文版试验课件讲解配音文案—解说词

英文配音英文版试验课件讲解配音文案
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Level 1 Level 2 Level 1: Perform the experiment according to the instructions given. Level 2: You will not get any instructions to perform the experiment. 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. This is not the required material. 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. Click on the correct option. Give the type of the reaction. (a)Combination reaction (b)Decomposition reaction (c) Displacement reaction Oxygen is produced by ___. (a)decomposition of MnO2 (b)decomposition of H2O2 (c)reaction between MnO2 and H2O2 Oxygen is collected in the gas jar by ___. (a)downward displacement of air(a) (b)downward displacement of water (c)upward displacement of water( Downward displacement of water suggests that ___. (a)oxygen is very slightly soluble in water (b)oxygen is soluble in water (c)oxygen reacts with water In this experiment, MnO2 is the ___.在
MnO2 does not undergo any chemical change in the reaction. The oxygen is produced by decomposition of H2O2. From the experiment, we can see that as the oxygen gas fills the gas jar, the water level in the jar comes down. Thus, oxygen is collected in the gas jar by the downward displacement of water. Oxygen gas is very slightly soluble in water. If oxygen were soluble in water, it would dissolve in water and would not collect in the gas jar. MnO2 catalyzes the reaction. It neither gets used up nor is produced in the reaction.MnO2  A substance which alters the rate of a chemical reaction without undergoing a permanent change itself. Downward displacement of water A method of collection of gas which is lighter than air and sparingly soluble or insoluble in water. A compound of hydrogen and oxygen with peroxide linkage. E_ You will understand the laboratory preparation of oxygen gas by the catalytic decomposition of hydrogen peroxide. E_ Preparation of oxygen from hydrogen peroxide, oxygen, manganese dioxide, hydrogen peroxide, catalyst, downward displacement
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