In April 2008, our city carried out the ninth grade chemistry experiment. The topics of chemical composition in a school are: ① Purification of crude salt ② Starch and glucose.

(2) According to the laboratory preparation method of carbon dioxide and the operation of instruments, drugs and experiments provided, it can be inferred that Xiao Kai obtained the preparation, collection and full inspection of carbon dioxide; The chemical reaction formula for preparing carbon dioxide is CaCO3+2HCl ═ CaCl2+CO2 ↑+H2O;

(3) There are two mistakes in Xiao Kai's operation: he did not turn the cork upside down when taking the liquid, and the burning match could not be put into the gas container when it was full;

(4) In the laboratory, hydrogen peroxide is used to produce oxygen in solid form, and the reaction does not need heating. The reaction principle is 2H2O2? MnO2？ . ? 2H2O+O2↑；

Oxygen production with potassium permanganate requires a device for heating solids, so it is necessary to supplement alcohol lamps.

So the answer is:

(1) an iron platform; ? B tweezers;

(2)3; ? caco3+2hcl═cacl2+co2↑+h20；

(3) There is an error in operation Ⅱ, and the cork should be put upside down; There is an error in operation Ⅳ, so put the match into the mouth of the gas container for full inspection;

(4)2H2O2？ MnO2？ . ? 2H2O+O2↑； ? spirit lamp