材料准备 制氧设备、制二氧化碳设备,两个能密封的透明有盖玻璃瓶。大豆若干粒、棉花、沙布、标签。 实验过程 利用设备制一瓶纯氧和一瓶二氧化碳,贴好标签。为了保持纯度都用排水法收集,拧紧瓶盖。然后把两份大豆包于沙棉中,沙棉吸足水份后,连带大豆各放入一个集气瓶中(放入时集气瓶倒置浸入水中。拧开盖从水中把大豆放入瓶内,然后密封好)。把两个瓶子放在室内便于观察的位置、观察记录。 Materials Preparation Oxygen making equipment, carbon dioxide equipment, two sealed, transparent, covered glass bottles. Soybean grains, cotton, sacks, labels. Experimental equipment using a bottle of pure oxygen and a bottle of carbon dioxide, labeled stickers. In order to maintain the purity drain method collection, tighten the cap. Then the two soybeans wrapped in sand cotton, sand absorption of water, together with the soybeans into a collection bottle (into the set when the gas bottle is inverted immersed in the water. Unscrew the lid from the water into the bottle of soybeans Within, then sealed well). The two bottles on the inside of the room for observation, observation records.