举例化学实验中的先后（Example the order in chemistry experiment）.docVIP

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举例化学实验中的先后（Example the order in chemistry experiment）.doc

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举例化学实验中的先后（Example the order in chemistry experiment）

举例化学实验中的先后（Example the order in chemistry experiment） Examples: the order in Chemistry Experiments In chemical experiments, the order of operation and reagent ordering is crucial to the success of the experiment. Now the common experiments are summarized as follows: 1. when the gas is extracted, the tightness of the device is checked first and then loaded into the medicine. 2. when the drainage method collects the gas, it will clean the air first and then collect the gas. When it is full, the pipe should be removed from the water and then extinguished. 3. hydrogen reduction of copper oxide and carbon monoxide to reduce iron oxide, first aeration (H2 or CO) after heating; after the experiment, first lights out, stop gas. 4. ignite flammable gases (H2, CO, CH4, C2H4, C2H2, etc.) should first test the purity, and then ignited. 5. tray balance weighing material, should be zero, after weighing; plus weight, you should add a large weight, and quality of small weight weighing; after the first record the reading, after the weight into the box, the rider moves back to zero. 6. if the thick H2SO4 accidentally touched the skin, first wipe quickly with a cloth, and then rinse with water, and then coated with 3% ~ 5% NaHCO3. 7. dilute the concentration of H2SO4, must first pour water into the container, and then concentrated H2SO4 along the wall slowly into the water, and constantly stirring. 8. using a dipstick test solution properties, first put a small piece of paper on the surface plate or glass slides with a glass rod to be stained after middle point liquid test, and then observe the change; properties of test gas, the first end with distilled water wetting stick in the glass rod after close inspection nozzle. 9. capacity bottle, should first use after leak burette etc.. 10. take medicine or a large mass of metal particles density into glass container, the container should be placed horizontally, after put the medicine into the container, the container slowly erected. 11. w