Students studying for exams at Phan Chau Trinh High School (Da Nang). The key knowledge in the high school graduation exam is in the 12th grade Chemistry program, the number of questions related to the 11th grade program is very small and mainly combined with the general knowledge question. Reinforce basic theory Ms. Huong said: Chemistry is an experimental science with a large amount of knowledge, ranging from theory at the level of awareness and understanding to exercises at a high level of application and application. According to Ms. Huong, from qualitative to quantitative exercises, experimental questions to questions related to economic, social, and environmental issues… most students focus on conquering Quantitative exercises with the desire to achieve high scores in the exam but forget that quantitative exercises only account for 25% of the exam structure (about 10 questions/40 questions of the Chemistry exam). Click on the image to view the content. “Students should have a more realistic view of the exam questions, thereby increasing the amount of time to review and consolidate basic theory into a fixed source of capital for themselves before each exam,” Ms. Huong said. In addition, Ms. Huong illustrates the learning method for the knowledge content on metal corrosion, metal preparation in the metal outline section. Systematic knowledge to grasp includes: Corrosion of metals and metal processing. Specifically, metal corrosion is the destruction of metal or alloy due to the action of substances in the surrounding environment (M > Mn + + ne). In particular, metal corrosion has two forms: chemical corrosion and electrochemical corrosion. Chemical Corrosion: Corrosion reaction does not generate electric current. And electrochemical corrosion: Corrosion reaction simultaneously generates electric current. Electrochemical corrosion occurs when in a material there are different electrodes, in contact with each other and placed in an electrolyte environment. Rust (corrosion of cast iron and steel objects in moist air, acid …): Fe-Anode (-): Fe > Fe2+ + 2e (Oxidation) C-Catot (+): O2 + 2H 2O + 4e > 4OH– (Reduction) Or: O2 + 4H+ + 4e > 2H2O Rust generation reaction: 2Fe + 3/2O2 + nH2O > Fe2O3.nH2O The similarity between chemical corrosion and electrochemical corrosion is the oxidation – reduction process. But chemical corrosion does not generate electric current, metal corrodes slowly; while electrochemical corrosion generates electric current, metal is corroded quickly. For metal protection against corrosion, there will be two methods of surface protection: Isolate metal from the environment by coating the metal surface with environmentally sustainable substances such as grease, paint, and plating. metal, enameled; also electrochemical protection that binds a metal to another more active metal. For example, attaching zinc to the steel hull (submersible part) will corrode the zinc and protect the hull. Preparation of metals, the principle of reducing metal ions to metal atoms (Mn + + ne > M). With methods of electro-treatment, heat-treatment and hydro-treatment. Formula for expressing Faraday’s law: (according to the number of moles of electrons exchanged). m: Mass of substance collected at the electrode (g) A: Molar mass of the substance obtained at the electrode (g/mol) n: Number of electrons exchanged I: Amperage (A) F: Faraday’s constant (F = 96500) Students need to draw connections, simple ways of remembering when doing related types of work. For example how to solve the question package about metal modulation methods like: Which of the following metals can be prepared by hydrometallurgy? A. Ca. B. Na. C. Mg. D. Cu. Which of the following metals can be prepared by solution electrolysis? A. Ag. B. Na. C. Ba. D. Al. You can use diagrams for this type of question like this: K, Ba, Na, Mg, Al – Zn, Fe, Ni, Sn, Pb, Cu, Hg, Ag, Pt, Au Molten electrolysis Solution electrolysis, heat treatment, hydrometallurgy. The way to do the test effectively is to calmly read the exam questions. Hundred or used manually Ms. Huong said: When reviewing, students need to remember the principle “Hundred or not with familiar hands”, repeating information as much as possible, the deeper the memory, the easier it is to recall. So do as many exercises as possible. When doing the test, there must be a relationship of knowledge, good points, and skills that need to be applied to each type of post; exchange materials with friends and teachers. Click on the image to view the content. “For lessons on mainstream theory, students need to master the definition and concept, understand the essence of that definition and concept, and know how to apply it to solve related questions. For the lesson on quality, candidates need to firmly grasp the name, properties, relationship between structure and properties, and practical application”, Ms. Huong said. According to Ms. Huong, in order to solve chemistry exercises, students first need to master the theory, then practice more skills in applying theory to specific exercises, problem analysis skills, and using tricks. calculate… According to Ms. Huong, the effective way to do the test is to calmly read the exam questions. With the form of theoretical questions, quickly read through the sentences to see the answers immediately, the questions are left to do later. With the question type of counting the number of true/false statements, in each statement should note the points in the topic. wrong, exception, it will be more convenient for you to check your work again. With the form of quantitative exercises, which sentences are familiar, have been met and done first. Which sentences are difficult and novel to do later and when done, you should combine looking at the answer because some sentences can be easier to navigate from the answer.

Ms. Bea Yuri, the representative of Gangwon province, introduced the culture and potential of cooperation between Vietnam and Korea in the online signing ceremony. Korea is currently a developed country with a strong capacity in capital, science and technology and rich development experience, is deeply involved in the global value chain, and is in need of a young and large market to continue. development momentum. Vietnam is a dynamic developing country that actively integrates into the world. Vietnam is a suitable destination with a golden population structure with nearly 100 million people, nearly 70% are aged 15-64; Vietnam and South Korea are two countries with unique factors that contribute to bringing the two countries’ relations closer and closer, facilitating the expansion of investment cooperation. The two sides have established dialogue mechanisms on economic cooperation, besides the culture between the two countries Vietnam and Korea have many similarities. The people of the two countries have a deep understanding of each other’s customs and practices, and the population of one country in the other is large; Before the Covid-19 pandemic, traffic between the two countries was increasingly convenient with more than 1,000 flights per month. Representative of Kotra Vietnam – Korea Company, Icon International and Asean Healthcare Company at the cooperation signing ceremony Today’s event marks an important step towards implementing Korea’s trade promotion, investment and technology transfer cooperation programs into Vietnam. Kotra Vietnam – Korea, Asean Healthcare are the exclusive distributors in Vietnam market of many lines of pharmaceutical products – cosmetics, functional foods, health promotion products, air cleaning, disinfection, insurance. protect living environment. In the context of the global crisis caused by the epidemic, the Korean partner has designed and developed many technological solutions, comprehensive solutions for health protection and disease prevention through special products. : IONIC – Air purification system, sterilization, virus removal in cars, families, schools, hospitals, offices, and crowded areas; HEYO – Water electrolyzer, disinfection, VirusKill – Antibacterial wearable in the air; Alkaline-rich Hydrogen generator…
Representative of Gangwon province Ms. Bea Yuri shared: “In recent years, provincial leaders have made great efforts to cooperate with the government and localities in Vietnam to promote exchanges between people, entrepreneurs and businesses. Currently in the context of the Covid -19 epidemic that is turning the world upside down, affecting all aspects of people’s lives, stagnating trade and investment, and declining health, we hope to approve the signing of the agreement. This cooperation will further promote the support of high technology transfer, increase import and export, and develop investment in Vietnam.” Mr. An Jun Sun General Director of Kotra Vietnam – Korea introduced the products at the launch ceremony Speaking congratulating the signing ceremony of strategic cooperation, Mr. Vu Minh Ly – Deputy Director of the Center for Communication of Resources and Environment (Ministry of Natural Resources and Environment) highly appreciated the efforts of the parties in promoting and implementing a cooperation program, this is a practical and beneficial direction for consumers to have more proactive health care and protection options that Korean friends have researched and developed technology to deal with, prevent The fight against the Covid epidemic is going on as complicated as it is today.
At the signing ceremony, the units officially launched to Vietnam market a product line for environmental protection, proactive disease prevention, VirusKill wearable card, Ionic device, Heyo… Besides, Kotra Vietnam – Korea and Asean HealthCare cooperates with businesses in Vietnam to cooperate in investment, technology transfer, production, and bring to consumers in Vietnam many high-quality products and technologies, proactive health care. such as functional foods made from Red Ginseng, Cordyceps; Herbal cosmetics, alkaline Hydrogen water purification equipment…. distributed in Southeast Asia and the world.
In the context that Vietnam and other countries around the world are learning how to live with newly arising diseases and Covid-19 is complicated, the product Heyo – Ionic – Virus Kill will be a useful tool. for the community to help protect their own health and protect the living environment.

The main difference between these three types of hydrogen lies in the number of neutrons in the nucleus. Protium is the default type of hydrogen in our natural habitat, which consists of a proton and an electron, while deuterium has an extra neutron when compared to proti and tritium with two more neutrons when compared to proti. . Most of the hydrogen in nature exists in the form of proti, with a relative abundance of 99.9844%, while deuterium abundance is relatively low, at about 0.0156%. For tritium, since abundance is less than 0.001% it is usually noted as a trace amount. During the recent nuclear wastewater incident in Fukushima, Japan, tritium content was a major issue being discussed. Tritium is radioactive and undergoes beta decay with a half-life of 12.43 years. It is often thought that it was caused by the interactions of cosmic radiation and hydrogen in the atmosphere. Since the introduction of nuclear technology, humans have produced 5 times more natural tritium (about 7.3 kg in nature). Although proti (H2O), deuterium (D2O), and tritium (T2O) differ in atomic composition, the differences in their chemical properties are very small (D2O and T2O are commonly known as heavy water and super heavy water). Also because many of the three properties are similar, tritium is also one of the most difficult to separate and remove substances in nuclear wastewater. However, non-radioactive heavy water is much more interesting than super heavy water. Since the density of heavy water is 10% greater than that of water, heavy ice can sink to the bottom in the water. In 1931, the American scientist Harold Clayton Urey discovered the isotope of hydrogen, deuterium and he also received the Nobel Prize in Chemistry in 1934. In 1933, Urey’s mentor Gilbert Newton Lewis produced 0.5 ml of heavy water by electrolysis of water, with a purity of 65.7%. Harold Clayton Urey However, deuterium in natural water does not always exist in D2O form, and it is more likely to exist as HDO (half heavy water). During the production of heavy water by electrolysis, when the HDO molecules reach a certain rate, there will be an exchange of hydrogen ions between the water molecules, and the ratio of D2O also increases accordingly. . When the method of producing heavy water by electrolysis appeared, it quickly applied in practice. The year after Lewis produced high-purity heavy water, Norway built the Venmork hydroelectric plant in 1934, which uses nature’s abundant water to electrolyze water, creating hydrogen for production. Nitrate fertilizers. Norway’s Venmork hydroelectric plant. However, the manufacture of chemical fertilizers requires hydrogen from electrolytic water, and does not use the heavy water remaining in the electrolysis cell. So after a period of operation, the plant analyzed the residue of electrolysis and found that the ratio of deuterium to hydrogen (protium) was 1:48, much higher than the natural ratio 1. : 6400, though most of them exist in semi-HDO form. So the Norwegian Hydropower Company accepted the request of the person in charge of the hydrogen plant to produce heavy water from the byproducts of electrolysis. Therefore, it can be said that Norwegian Hydropower has become the earliest heavy water supplier in the scientific community. However, the story of heavy water has only just begun. In late 1938, the Germans discovered that the bombardment of a neutron on uranium could cause nuclear fission. In late 1939, the Soviet Union concluded that heavy water and graphite were the only viable regulators for uranium reactors, and each of these reactors required about 15 tons of heavy water to function. So heavy water then became a strategic substance because it can slow down the neutrons produced by chain nuclear reactions, and all nations take it seriously. From 1940 to World War II, the Norwegian heavy water plant was under Nazi control and bought nearly all of the heavy water in bulk. Allied forces crossed the mountain plateau to destroy heavy water factories under Nazi control. In short, when heavy water first appeared was associated with nuclear reactions, many people’s first impression of it was extremely dangerous, but it was not. Right after the discovery of heavy water, scientists were curious about it, so someone drank heavy water right after the discovery of deuterium. GeorgeCharles de Hevesy and Harold Clayton Urey, who discovered the deuterium, were good friends. In 1934, Hevesy asked Urey to get several liters of heavy water with low purity, only 0.6%. Hevesy then drank this heavy water to use deuterium as a marker, studied the water metabolism of the human body, and eventually concluded that the average residence time of water molecules in the muscle. human body is 13 ± 1.5 days. But if absorbing the amount of heavy water with a higher purity, it will have a significant effect on the body of animals and plants. Plants will die in high concentrations of heavy water. Animals such as mice and dogs will become infertile if D2O reaches more than 25% in the body, and fish will die rapidly in water that is more than 90% heavier. Mammals will die about a week after being given about 50% heavy water. In fact, humans and animals can hardly be exposed to such high purity heavy water, except animals raised for research purposes.

An auto warranty is a must-have when buying a car, demonstrating the manufacturer’s responsibility to the customer, making sure the product is sold at its best and increasing the buyer’s confidence. Currently, some car manufacturers confirm the quality of the car through warranty. However, the car owner should note that for some cases such as adding some accessories and toys on the car, it is possible that the warranty will be denied. Refusal of car warranty “degree” Warranty between car manufacturers may vary, but there are some common features regarding the eligibility of the warranty as well as disclaimer. In particular, many car owners are also confused that they will be denied the warranty. Mr. Nguyen Hoang Quan shared: “I need advice on installing options such as DVD, subwoofer, reverse sensor, camera … In general, it is related to the electrical part and works at the outside garage that is not managed by the car manufacturer . But when buying a car, the sales staff told me that it will not be covered by the warranty according to the regulations. ” Issues such as glazing and floor coverings do not affect the vehicle’s warranty. Photo: THY NHUNG Accordingly, some people believe that this is just a “trick” for sales of employees, while mounting toys outside will not affect the car warranty. However, there are also some opinions that car owners should consider and ask the car manufacturer before adding the interior. “I think that before doing it, I also advise some brands, instead of installing it outside, the owner can buy accessories to bring into the installation company and still be warranted. Most of the electric damage is due to the addition of toys (electrical parts) without reference to the design diagram of the circuit according to the vehicle “- said Mr. Ngo Quynh, a car owner. According to a survey of PV, although according to regulations of some car manufacturers, the installation of toys or not depends on the toy involved, affecting which parts of the vehicle. For example, furniture such as screens, speakers or cameras … affecting the electrical system may be a possibility that the car company will refuse the warranty. However, not all car manufacturers “impose” this regulation. Each car company rules differently The installation of accessories can cost the cheapest about 200,000 VND and the highest up to tens of millions VND. Having lost a large amount of cost to “level” the car, in addition to not being warranted, the owner should also note. Mr. Chien, Manager of Muoi Hung Auto store, said that it depends on the position that the owner of the car can replace or renew. For example, cars such as Audi, Lexus, BMW, … luxury cars, technically not hard-skilled will be susceptible to errors, so the firms refusing to warranty are correct. For large interiors, more skilled engineers are likely to make no impact. “Ordinary cars are not a problem, but when buying a car, the sales staff will also advise customers” – Mr. Chien said. According to Mr. Chien, related to the screen, lights, sound, the use of electric wires is likely to affect. It’s okay to have parts like flooring, leather or glazed. Because in the process of doing, there are errors that the technicians do not notice, affecting the safety of the vehicle, this problem cannot be confirmed. Universal models with normal structure and not as detailed as luxury cars will be more difficult to handle. Regarding this issue, the director of a car dealership in Ho Chi Minh City also shared: “This is not a strict regulation of car manufacturers, but this regulation is intended to ensure safety for owners, especially when traveling on the road ”. In some cases, warranty may be denied – In cases where customers take the car for maintenance and care at other facilities, not with the company’s warranty center. If there is any damage or damage, the car company is not responsible for handling. – Products and liquids such as oils, greases, battery electrolytes, radiator coolants, air conditioner refrigerants, power steering fluids and other items not approved by the manufacturer Export specified. Any damage caused by or related to the above products is not covered under warranty. – Damage caused by participating in racing, parade or any competition, if damage occurs, the automaker is not responsible. – Installation and replacement by non-genuine parts causing damage to the vehicle. Such as coolant, raw material, lubricant is not suitable for vehicle. – Using non-genuine parts or using the wrong fuel, lubricant or liquid not recommended by the manufacturer. – When modifying or assembling or dismantling equipment on the vehicle, affecting the function and operation of the vehicle.

The RO water purifier line appeared and prevailed in 2003, when the problems of water pollution appeared more, people became more aware of the clean water used in the family. This is also the time when Kangaroo launched its first RO water purifier in Vietnam, in order to help users form the habit of drinking water directly at the tap, instead of boiling and letting it cool as before. According to Kangaroo’s representative, RO water purifiers are favored for their water quality after filtration and convenience. Accordingly, in natural water there are often many impurities, so RO filtration technology is suitable thanks to the ability to filter to a microscopic size of 0.001 micromet. In 2017, after researchers discovered the ability to split water molecules, create hydrogen and alkaline water with effects such as alkalizing the body, removing oxidants …, alkaline hydrogen ion water purifier began to be known. At that time, Kangaroo first introduced to the Vietnamese market a ceramic mineral hydrogen water purifier incorporating RO filtration technology. This product quickly accounted for 30% of the total production of Kangaroo. The entry of imported goods helps to increase consumer choice. However, the barrier for these machines to access the Vietnamese market is price and suitability. Representative Kangaroo said: “We also have imported complete products, however, only a small number of consumers will easily access it because the prices are all from over 40 million VND. In addition, the bottom line is that the filtration technology of these machines is only UF (ultrafiltration), do not use RO membrane, so water treatment for the standard machine is a problem, most of the time. the family has to equip 1 more filter device, quite complicated ”. Determined to bring alkaline hydrogen ion water to every family Mr. Lai Trung Tung – Director of the Kangaroo Institute for Research and Application said: “Realizing the value of alkaline hydrogen ion water, Kangaroo is determined to universalize this water source, reduce product costs to be able to come. with a large number of Vietnamese people ”. Accordingly, reverse osmosis RO technology is capable of purifying water, then replenishing minerals that are beneficial to the body and electrolysis to create alkaline hydrogen ion water. This technology helps users to control well the water source for daily use, water containing hydrogen to 1500ppb, alkali from 7.5 to 9. Kangaroo’s Trio of Hydrogen 2021 Water Purifiers include: KG10A6s, KG100EED and KG100ES1 (from left to right) The trend of equipping health care equipment is evident after the effects of the Covid-19 epidemic. Kangaroo recorded an increase in demand for water purifiers that not only filter but also create healthy water sources, up 20% year-on-year. “However, the market capacity is still very large, the proportion of people using water purifiers in Vietnam is generally low compared to the total population. Water purifier should be a product that is equipped in every household ”, said the Kangaroo representative. See the Clip at: https://www.youtube.com/watch?v=ffoim2e6Z9U Kangaroo offers products with superior features that solve a variety of problems from the input country, with prices ranging from 9-13 million VND. The alkaline hydrogen ion water purifier is expected by the company to become a replacement for conventional RO filters. Kangaroo’s representative shared: “With a set of 3 alkaline hydrogen ion products that have just been launched in April 2021, Kangaroo has added a full set of products: from integrated heating, electronic and mechanical control, Diverse designs (from vertical to desktop) … addressing the problems of previous models. The product is currently subject to a subsidy policy set by Covid-19. The first 10,000 products are subsidized, after which we will apply the regular pricing policy ”. Kangaroo launches a trio of new alkaline Hydrogen ion water purifiers, highlighted by a series of integrated heating and cooling functions, which are expected to replace conventional water purifiers and hot and cold water plants. All 3 products are equipped with the exclusive RO water electrolysis technology; at the same time, integrating other technologies such as: RO vortex membrane, 3-step quick connection system, monolithic core set to limit re-infection … The three new products are applied with electronic warranty by Kangaroo, giving users better control over the condition of the machine. Along with that, manufacturers also directly support customers during use. Products are warranted for 2 years. For customers who buy the device, activate the electronic warranty before July 1, 2021, the company will receive an additional 1 year warranty and have the opportunity to dial in to win the iPhone 12 Pro Max.

The highlight of KG10A6S integrates electronic control; Hot, cold and Hydrogen water can be turned on in one tap by touch operation. If the customer wants to get hot water, it should be touched and held for 3 seconds, this is to ensure your safety in case of cleaning the machine, accidentally touching, or children playing around next to the machine. At the same time, to make it easy for customers to know the operating status, the device has integrated a display light to notify when the machine is heating water, when the water is being cooled or when the water in the bottle is about to run out. KG10A6S has a long, wide and high 29 x 34 x 90cm, respectively, equivalent to the size of a hot and cold tree, so customers will not spend too much space to place the device. The Kg100ES1 Kangaroo Alkaline Ion Hydrogen Water Purifier is up to 50% more compact than traditional machines Second product in set The 3 new Kangaroo alkaline water purifiers are KG100ES1, the upgraded version of KG100ES launched in 2020. The advantage of, KG100ES1 lies in the convenient open-wing structure with 5-in-1 integrated core, the RO vortex membrane reduces waste water and synchronizes quickly to help the machine. more compact. In addition, this product is also capable of generating Hydrogen water up to 1,500 ppb and pH up to 9 according to the test at Kangaroo research institute. The length, width and height of this product are 290 x 340 x 960 cm respectively. Highest, most convenient and compact version of the 3 products Kangaroo is just debuting KG100EED. This device possesses a monolithic inner core system of the machine, ensuring the cleanliness factor as well as easier disassembly. This is an upgraded version of the KG100MED 2020 model. In particular, the KG100EED has an electronic control hose immediately, if customers want to get water, just touch lightly. In addition, the company also equips with electronic chips so that customers can control the status of the machine; For example, to be warned about a leak, when to replace the core as well as automatically rinse the RO membrane, … In which, with the function of a water leak warning, if there is a small amount of water overflowing the camera body. , the machine will immediately stop working, turn off the water and display the indicator light for customers to detect and handle. Kg100EED Kangaroo Alkaline Ion Hydrogen Water Purifier with electronic control According to Kangaroo experts; “Most of the alkaline ionizing water generators coming to Vietnam need to equip a water purifier before adding water to electrolysis, which leads to a relatively high cost price increase. At the same time, the frequent need to replace the core for the water purifier is also a big obstacle for users. Meanwhile, Kangaroo’s new alkaline Hydrogen ion water purifier has effectively integrated water purification RO filtration technology and alkaline hydrogen ion electrolysis technology in one device. Specifically, the Kangaroo alkaline Hydrogen ion water purifier is equipped with the company’s exclusive RO water electrolysis technology, incorporating more modern technologies such as the RO vortex membrane to save up to 70% of wastewater, and the system to connect quickly 3 step, monolithic cast core set to prevent re-infection. Thanks to the above advantages, this product won the “Excellent brand of water purifier” at the Tech Award in January. In addition, the three new products are also applied with electronic warranty by Kangaroo, helping users to better control the condition of the machine, manufacturers also directly support customers during use. Products are warranted for two years; Especially, for customers who buy the device, activate the electronic warranty before July 1, 2021, the company will offer an additional 1 year warranty and have the opportunity to dial in to win the iPhone 12 Pro Max. Kangaroo alkaline hydrogen water purifier launched in June 2020, certified as a scientific and technological product. Available at https://hydrogenionkiem.kangaroo.vn/