Xiao Min came to the laboratory to complete the oxygen and carbon dioxide gas production experiment. Please answer the questions as required: ① There are instruments and medicines as shown in Figure A

Xiao Min came to the laboratory to complete the oxygen and carbon dioxide gas production experiment. Please answer the questions as required: ① There are instruments and medicines as shown in Figure A in front of the experimental bench. Please

(1) The iron stand is a commonly used blessing instrument, and the gas collecting bottle is an instrument for collecting gas. If hydrogen peroxide and manganese dioxide are used to produce oxygen, heating is not required. Hydrogen peroxide acts as a catalyst in manganese dioxide. To generate water and oxygen under the conditions, attention should be paid to balance; therefore the answer is: iron stand; gas cylinder; manganese dioxide; 2H 2 O 2 Mn O 2 . 2H 2 O+O 2 ↑; manganese dioxide; 2H 2 O 2 Mn O 2 . 2H 2 O+O 2 ↑;

(2) In the main step of Xiao Min’s experiment, the preparation of gas is wrong, because the lower mouth of the long-neck funnel is above the liquid level, generating The gas escaped; the correction is: the lower end of the long-neck funnel should be below the liquid level; conduct the experiment after the correction. The correct order of these steps is: check the air tightness of the device, prepare the gas, collect the gas, clean the instrument, and organize the desktop ; So the answer is: a; the lower end of the long-neck funnel should be below the liquid level; c a b d;

(3) Using this device to select another drug can also complete the preparation of carbon dioxide gas, and exchange calcium carbonate and hydrochloric acid with each other. The ingredients generate calcium chloride, water and carbon dioxide, which can be balanced; so the answer is: CaCO 3 +2HCl=CaCl 2 +H 2 O+CO 2 ↑;

(4) The advantage of device B is that it can Control the occurrence and stop of the reaction at any time. If you open the spring clip and the solid comes into contact with the liquid, the reaction can occur. When the rubber tube is clamped with the spring clip, the gas generated increases the pressure in the container (test tube) and presses the liquid back. In the long-neck funnel, the reaction will stop when it is separated from the solid reactants, so the answer is: When the rubber tube is clamped with a spring clip, the gas generated increases the pressure in the container (test tube) and presses the liquid back into the long-neck funnel In the funnel, the reaction will stop when it is separated from the solid reactants;