(2) by the instrument's graphics and use can be known as A for the dispensing funnel; with the method of oxygen and collect a bottle of dry oxygen, can not be drained, can only be used to collect the method of upward exhaustion of air, due to the hydrogen peroxide solution has water, go to the Analyze the answer.
(1) both reactions are a substance to generate two or more substances, are decomposition reactions; so the answer is: decomposition;
(2) by the instrument's graph and use can be known as A for the dispensing funnel; with the method of oxygen and collect a bottle of dry oxygen, due to the hydrogen peroxide solution has water, resulting in the preparation of the oxygen contains water, we need to remove water, the concentrated sulfuric acid has a water absorption, can be collected by upward air venting method, due to the hydrogen peroxide solution has water, go to water, and the water is not water. Concentrated sulfuric acid has a water absorption, can be used as a desiccant, the direction of the gas into the "long in and short out" (otherwise it will be pressed out of the bottle of concentrated sulfuric acid), if the collection of the drainage method, then it will be mixed with water, can only be used with the upward exhaust air method, with the collection of the upward should be from the long conduit into the oxygen due to the density of the oxygen is greater than the air, the oxygen deposited in the collection of cylinders, from the bottom up, filled with the oxygen, and then the oxygen is collected from the bottom up, the oxygen is collected from the bottom up. The bottom of the cylinder, from the bottom up, filled with cylinders; so the answer is: ① ③ ④ ⑧.
Points:
This question is about: oxygen production device; oxygen collection methods; reaction type determination.
Comments: concentrated sulfuric acid is absorbent, can be used as a desiccant, the direction of the gas into the "long into the short out" (otherwise the bottle of concentrated sulfuric acid will be pressed out).