1. Physical properties of water: colorless and odorless liquid.
Water is used for human drinking, cleaning, agricultural irrigation, hydroelectric power generation, etc.
2. Table salt is a white cubic crystal or fine crystal powder.
Uses of table salt include: skin cleaning, medical treatment, sterilization and disinfection, tooth protection, beautification, decontamination, important chemical raw materials, edible products...
3. has a sweet taste, odorless, white particles easily soluble in water and glycerin, slightly soluble in alcohol.
Sucrose has many uses.
1. It is a natural food that plays an important role in human nutrition and health.
2. As a sweetener in food and industry, it is also used as a freezing point improver, flavoriorating the crystals and raising agent.
3. It can also color cooked and baked foods.
4. Copper wire is a metallic material with good electrical and thermal conductivity.
In daily life, copper wire is used to make wires, cables and brushes; to manufacture magnetic instruments and meters that need to be protected against magnetic interference, such as compasses, aviation instruments, etc. ; is easy to process by hot and cold pressing. It can be made into copper materials such as tubes, rods, wires, strips, strips, plates and sheets.
Detailed information
How to distinguish between salt water and sucrose water, excluding oral taste.
(1) Place a small amount of salt water and sucrose water on the piece of glass. Once some of the water has evaporatedore, touch it with your hands. Sucrose water will be sticky, but salt water will be. I don't have this phenomenon. (Different solutions have different physical properties, such as viscosity, etc.)
(2) Heat the two solutions after the water evaporates and continues to be heated, the color of the Sucrose will turn yellow or black. , but not the color of table salt.
(3) Connect a circuit and insert two electrodes into the solution. The one that conducts electricity is salt water. Sodium chloride is a strong electrolyte and sucrose is a non-electrolyte.
(4) Use a wire to dip the two solutions and burn them on a gas lamp. The one with a flaming color reaction is salt water.
(5) Heating to evaporate the two solutions into a saturated solution, then cooling to lower the temperature. The one that can precipitate more solids is sucrose water. As theas temperature increases, the solubility of sucrose also increases significantly; The solubility of sodium chloride does not change much with temperature.
(6) The white precipitate produced by falling silver nitrate is salt water.
(7) Add a few drops of sulfuric acid, then add a solution of starch potassium iodide. What turns blue is salt water, and salt contains potassium iodate.
Reference documents:
Baidu-Water EncyclopediaBaidu Encyclopedia-Salt
Baidu Encyclopedia-Sucrose
Baidu Encyclopedia-Copper Wire