双语Carbon dioxide.docVIP

Properties of carbon dioxide Outline：1.Physical properties of carbon dioxide 2.Chemical properties of carbon dioxide From: 九年义务教育三年制初级中学教科书Chapter5 Good morning ,everyone! Welcome to my class! Before class, I ask you some question: Do you hear of the greenhouse effect? What kind of gas caused by the greenhouse effect? What knows the answer? Carbon dioxide.What important properties of carbon dioxide? This class, We learn the properties of carbon dioxide tegether. 1.Physical properties of carbon dioxide Firstly,we learn about the physical properties of carbon dioxide. This bottle filled with carbon dioxide. Look carefully. What state is it? It is gas. What color is it? It is colorless. How about the density of carbon dioxide. With this question,let us look at the media. Tie two similar size small paper bags to both sides of a thin wood rod. Tie a thin rope to the middle of the wood rod to maintain balance ,and tie the other side of the rop to an ion supporting stand. Pour carbon dioxide quickly into one of the small paper bags. What happens. The two paper bags still balance? The bag filled with carbon dioxide is tilted. It show carbon dioxide has a higher density than air. Carbon dioxide has a density of 1.977 g/L, about 1.5 times than of air. Can the Carbon dioxide dissolve in water? Let us do an experiment. This bottle filled with carbon dioxide. This is water. Now, I pour the water into bottle, tighen the lid and shock it. Look carefully, what happen? The bottle defate. It shows that Carbon dioxide can dissole in water. 2.Chemical properties of carbon dioxide Now, let us do an experiment. Put the candle on the bottle, lit it. Pour into carbon dioxide. Pay attention to what happens to the burning candle. The candle goes out. This experiment shows carbon dioxide does not burn, nor help burning. Finally, take a summary. By the class, we know physical properties : carbon dioxide is a colorless