Photography of chemical experimental supplies

(1) Water tanks and gas cylinders are commonly used instruments in laboratories, so the answers are: ① Water tanks ② gas cylinders.

(2) Calcium chloride, water and carbon dioxide are generated by the exchange of components between calcium carbonate and hydrochloric acid, so heating is not needed. Carbon dioxide can be dissolved in water, and its density is higher than that of air, so it can only be exhausted upward. So, the answer is: Be, CaCO3+2HCl = CaCl2+H2O+CO2 =

(3) The combination of the plastic bottle with the bottom removed and the connected conduit is equivalent to a long-necked funnel in the laboratory. In this paper, the preparation method of gas is improved. The improvement of the experimental device realizes the reuse of resources and is more environmentally friendly. The advantage of the improved device is that the reaction can be controlled at any time. So the answer is: the long-necked funnel can control the reaction at any time.

(4) The combination of device A and device C can produce oxygen, and potassium chlorate can produce potassium chloride and oxygen under the condition of manganese dioxide as catalyst and heating, and can reach a balance; If it is water in F, as long as it is gas that can be collected by drainage method, it must have entered from a short pipe when it is brought out; When you turn it upside down, you must enter through a long tube. So the answer is: 2KClO3? Manganese dioxide. △2 KCl+3 O2↑； ? When device F is filled with water, it moves forward, and gas enters from end B (or device F is put back after being filled with water, and gas enters from end A).