Phenomena explained in daily life with knowledge of chemistry

1.A good property of solutions is that the melting point (freezing point) will be reduced, for example, we must have experimented in junior high school where the freezing point of alcohol was reduced after mixing with water.

This is a good example of how CaCl2 is added to water, and the voids between the water molecules fill in the CaCl2 example, making it impossible for the molecules to combine at the original temperature to form a solid state. So a lower temperature is needed for him to solidify.

Moreover, calcium chloride is a water-absorbing chemical, so it can be mixed in cement to avoid hardening caused by the hydraulic hardness of cement.

2.The first two are already very good.

The section of the wooden pole buried in the soil should be blackened to take advantage of the stability of carbon at room temperature.

Wet clothes dry faster when left in the sun, and the higher the temperature, the faster the molecules move.

The heating pipe should be coated with a layer of zinc, and the zinc can be used to form a dense oxide film to protect the metal inside.

And of course there are many more.

Junior Chemistry - Endothermic and Exothermic phenomena during dissolution.

The three phenomena in life explained with chemical knowledge are as follows:

1. The reason why the non-stick pan does not stick to food is because the bottom of the pan is coated with a special substance: "Tefuron", whose chemical name is PTFE, commonly known as plastic king.

2. After strenuous exercise, I feel soreness all over my body, which is because of the increase in lactic acid in the muscles.

3. After the frost falls, green vegetables, radishes, etc. taste sweet, because the starch in green vegetables is hydrolyzed under the action of enzymes in plants to generate: glucose.

4. The reason why the authentic handwriting of ancient calligraphers in China can be preserved to this day: the use of ink or carbon ink makes the handwriting not fade for a long time, because the chemical properties of carbon are stable.

5. The lamp made of a certain gas is filled into the quartz tube, which can emit a strong light hundreds of millions of times stronger than the fluorescent lamp when it is energized, so it is called "artificial little sun". The gas filled in this lamp is: xenon.

Chemistry explained.

chemistry]

The study of the composition, structure and properties of matter and its transformation is explained in detail (1).The science that studies the composition, structure, properties, and laws of change of matter is a basic discipline in the natural sciences. (2).

Refers to celluloid . For example, this comb is chemical.

Word decomposition Interpretation à change in nature or form : change. Split apart.

Rigidity. Teaching. Melt.

Melt. Exert a subtle influence on. Turn dry into jade silk.

Buddhists and Taoists collect money: turning into a relationship. Fasting.

Used after a noun or adjective, it indicates a transformation into a certain nature or state: ugliness. Greening.

Customs, Interpretation of Style, Learning, Imitation, Delving into Knowledge, Acquiring Knowledge, Reading: Student. Apprentice.

Learn. Academic. Xueyou.

Scholar. Learn the valve. Academic.

Degree. Toddler Handan (ridicule that people only know imitation, are not good at learning and have no achievements, also known as "Handan toddler"). Where knowledge is imparted:

School (abbreviated as "Learning".)

Problem solving ideas: (1) Soapy water can be used to distinguish hard water and soft water in life, soft water with more foam and less scum is produced in soft water, and hard water with less foam and more scum is produced

2) Analyze and solve the problem according to the fact that the molecule is in constant motion

3) Determine the chemical formula of the substance according to the molecular model, then write the chemical equation, and then obtain the information according to the number and type of atoms before and after the reaction

1) The difference between hard water and soft water lies in the amount of calcium and magnesium ions it contains, soapy water can be used to distinguish hard water from soft water in life, soft water with more foam and less scum is produced in soft water, and hard water with less foam and more scum is produced; When washing clothes with well water, the soap is less likely to foam and produce scum because the well water can be hard

2) Wet clothes can be dried because the water on the clothes is made up of water molecules, and the water molecules are constantly moving into the air

3) From the microscopic diagram of the reaction, it can be seen that the chemical formula of the compound in the reactant is CH4, and the chemical equation of the reaction is: CH4+2O2

Ignition of CO2+2H2O, so the ratio of the number of particles of each substance in the product is 1:2, and from a microscopic point of view, a piece of information about the change of matter can be obtained: before and after the chemical reaction, the type and number of atoms do not change

So the answer is: (1) hard water; (2) the molecules are in constant motion; （3）1：2；Before and after the chemical reaction, the type and number of atoms do not change.

Comments: Test points for this question: hard water and soft water; Application of Particle Perspectives and Model Diagrams; Analyze and solve problems using the properties of molecules and atoms