So: alcohol lamp.
② According to the drugs and experimental instruments provided, it can be judged that the test paper drawn by classmate A should be the preparation of carbon dioxide;
The principle of this experiment is that calcium carbonate reacts with dilute hydrochloric acid to produce calcium chloride, water and carbon dioxide. The chemical equation is: CaCO3+2HCl ═ CaCl2+H2O+CO2 ↑;
Optional instruments are: conical bottle, gas container, glass sheet, single-hole rubber plug with catheter, etc. Among them, the single-hole rubber plug with catheter should be g, not H.
Therefore, fill in: preparation of carbon dioxide; caco3+2hcl═cacl2+h2o+co2↑； ACG。
(2) The required mass of sodium chloride is 50g× 10%=5g. When dissolving sodium chloride, stir with a glass rod to accelerate the dissolution.
So fill in: 5; Stir and accelerate dissolution.
(3) The chemical equation for decomposing potassium permanganate by heating is 2KMnO4? △? . ? K2MnO4+MnO2+O2↑。
So fill in: 2KMnO4? △? . ? K2MnO4+MnO2+O2↑。