(1) The name of the apparatus A is the dispensing funnel;
(2) The chemical equation of the reaction in B is: Zn+2HCl═ZnCl2+H2↑;
(3) Huang ground the lump of copper-zinc alloy into powder before the experiment, which aims to accelerate the rate of reaction;
(4) How to check the tightness of the device: raise the tube D, after a moment of rest, there is still a difference in height between the liquid level of C and D, then the tightness is good. ) how to test the gas tightness of the device: raise the D tube, after a moment of rest, C, D liquid level still exists height difference, then the gas tightness is good;
(5) in order to make the volume of the gas measured more accurate, record the scale of the liquid level in C, in addition to making the line of sight and the lowest part of the concave liquid level, but also make the liquid level in D, C;
(6) Xiao Huang found that due to the lack of a certain step in the experiment (6) Huang found that the lack of data in the experiment due to the lack of a step can not be calculated, the step is: measure the mass of the sample of copper-zinc alloy;
(7) usually before the experiment must be estimated amount of drugs, if the experiment process, found that the amount of hydrochloric acid is not enough, should be added halfway or re-experiment: re-experiment; the reason is that when adding the acid in the middle of the day, it will cause the gas to escape, which will affect the precise measurement of the volume of the gas.