Wuhan physics and chemistry students' experimental examination time

The test time of experimental operation for physics and chemistry students in Wuhan is April 2023 1 1.

1. Conventional physical and chemical indexes: loss on drying, residue on ignition, ash, PH value, solubility, melting point, derivative melting point, specific rotation, absorption coefficient, refractive index, relative density, viscosity, freezing point, iodine value, alkali value and hydroxyl value.

Physical and chemical inspection includes: chemical analysis, physical test and metallographic examination.

2. Chemical analysis usually includes material composition inspection, physical test usually includes physical parameters such as hardness, strength, yield and plasticity, and metallographic examination usually includes macroscopic examination of metallographic structure. Physical and chemical inspection Physical and chemical inspection refers to the inspection with the help of physical and chemical methods and some measuring tools or instruments, such as micrometer, dial indicator, gauge and microscope.

When conducting physical and chemical experiments, we should pay attention to the following points:

1. Read the experimental instruction carefully before the experiment to understand the experimental steps, conditions, time and requirements.

2, to ensure that the experimental equipment and drugs are fully prepared, and pay attention to the preservation and custody.

3. Wear necessary safety protection articles in the laboratory, such as lab clothes, protective gloves and goggles, to ensure safety.

4, the operation should follow the experimental steps, the correct use of experimental equipment and drugs, to avoid misoperation and accidents.

5. During the experiment, we should pay attention to the recording of experimental results and the way of data processing to ensure the accuracy and comparability of experimental results.

6, after the completion of the experiment, the experimental equipment and drugs should be cleaned up, and promptly report to the laboratory management personnel any experimental safety or drug management problems.

7. Abide by the laboratory code of conduct, keep the laboratory environment clean and safe, and ensure the safety of yourself and others.