Draw lots for the experimental middle school entrance examination

(2) Preparation, collection and filling of carbon dioxide

(3) The bottle stopper is not inverted when taking the liquid; Don't put burning matches in the gas tank when it is full.

(4)

(5) Alcohol lamp

In this paper, the generator and collector of common gases and their selection methods, the names and selection of common instruments, the operation steps and matters needing attention in oxygen production were investigated.

(1) Understand the names and uses of commonly used instruments. A's name is iron shelf;

(2) According to the operation of instruments, drugs and experiments provided in the title, combined with the laboratory preparation method of carbon dioxide, it can be inferred that Xiao Kai painted the preparation, collection and inspection of carbon dioxide;

(3) According to the basic operation of the experiment, we can see that there are two mistakes in Xiao Kai's operation: the cork was not reversed when taking the liquid, and the burning match could not be put into the gas container when it was full;

(4) As a solid-liquid reaction device without heating, hydrogen peroxide is used to produce oxygen in the laboratory, and the reaction principle is 2H 2 O 2? 2H 2o+O2↑； Using potassium permanganate to make oxygen also needs a solid heating device, so it needs to be supplemented by alcohol lamp.