The Story of the World

The phenomenon of mutual reaction of substances differed depending on the type of reaction and the substances involved in the reaction. 1. ** Combination reaction ** - Magnesium burns in oxygen. It burns intensely, emitting a dazzling white light, releasing a large amount of heat, and forming a white solid. - Sulfur burns in oxygen: light blue flames in air; bright blue-purple flames in pure oxygen, giving off heat and producing pungent gases. - The carbon burned in the oxygen. The air was red and hot, and the oxygen emitted white light and heat, producing a gas that could turn clear lime water turbid. - Phosphorous burns in the air: intense combustion produces a large amount of white smoke, heat, and white solid. - Iron burns in oxygen: it burns violently in oxygen, sparks fly, heat is released, and a black solid is formed. - The hydrogen burned in the oxygen, emitting a light blue flame and heat. A dry and cold beaker was placed above the flame, and small droplets were formed on the walls of the beaker. - The reaction between calcium dioxide and water would release a lot of heat. - The carbon dioxide reacted with water. The carbon dioxide passed into the purple litmus, and the purple litmus turned red. 2. ** Dissociation reaction ** - The hydrogen peroxide-catalyze decomposition of the manganese-dioxide produced a large number of bubbles, forming a gas that could reignite the spark wood. - Heat decomposition of Permanganate: There is the formation of Manganate, Manganese Dioxid, and oxygen. - High temperature decomposition of calcium dioxide: It produces calcium dioxide and carbon dioxide. - Water decomposition: bubbles are formed on the pole; the volume of gas generated by the positive pole is 1/2 of the volume of gas generated by the negative pole; the gas generated by the positive pole can reignite the wood with sparks, and the gas generated by the negative pole can burn. 3. ** Substitution Reaction ** - The reaction between the sulfuric acid and the copper: a large number of bubbles emerge and release heat (or the temperature of the test tube wall rises). - Reaction of the acid with the metal: The reaction is the same as the reaction between the acid and the metal. - Reaction between sulfuric acid and magnesium-like reaction between sulfuric acid and zinc-like reaction. - Reaction of sulfuric acid with calcium: The same reaction as that of sulfuric acid with calcium. - Iron reacted with sulfuric acid. Bubbles appeared on the surface of the iron nail, and the solution turned from colorless to light green. - Reaction between iron and sulfuric acid: The same reaction as the reaction between iron and sulfuric acid. - Reaction between aluminum and sulfuric acid: a large number of bubbles emerge and release heat (or the temperature of the test tube wall rises). - Reaction between aluminum and sulfuric acid: The same reaction as the reaction between aluminum and sulfuric acid. - The hydrogen reacted with the copper dioxide, turning the black solid into red, and water droplets formed on the wall of the instrument. - The carbon reacted with copper dioxide: the black solid turned red, producing a gas that turned clear lime water turbid. - The carbon reacted with the iron oxide-the reddish-black solid turned black, producing a gas that turned clear lime water turbid. - Copper reacted with silver nitrates: silver-white metallic solid separated from the surface of the red solid, and the solution turned from colorless to blue. - Iron reacted with copper sulfuric acid: a red solid appeared on the surface of the nail, and the solution turned from blue to light green. 4. ** Metathesis reaction ** - Reaction of the solution with sulfuric acid: No obvious change (The neutralizing reaction releases heat but the temperature does not change significantly. If a few drops of phenylethanes are added to the solution, the solution will turn red. Then, diluted sulfuric acid is added drop by drop, and the red color of the solution fades, which proves that the two have reacted. If the red color has just faded, the two have completely reacted). - Reaction of sulfuric acid with soda ash: The same reaction as that of sulfuric acid with soda ash. - The reaction between calcium carbonite and sulfuric acid: the white solid is reduced, bubbles are formed, and the gas that can make the clear lime water turbid is formed. - Reaction between the soda ash and the acid: the white powder disappears (if the solution of soda ash is mixed with diluted acid, there is no such phenomenon), and a large number of bubbles are generated, which can turn the clear lime water into turbid gas. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

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It only mentioned that Quanjiao has three places for the central and western rural order oriented free undergraduate medical student enrollment and training work supported by the central government. Their majors include clinical medicine, traditional Chinese medicine, and Mongolian medicine. However, it did not mention what free majors are available in the local universities in Quanjiao. Sorry, according to the information retrieved, I don't know how to answer. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

Here are some must-see attractions in Guangdong: - Guangzhou Tower: The tallest tower in China, located near Chigang Tower in Haizhu District of Guangzhou. It is a national 4A tourist attraction with a unique shape and is called "Small Man Waist". The tower is more than 600 meters high. After the lights are turned on at night, you can walk along the bank of the Pearl River to enjoy the beautiful night view. It is also suitable for taking photos and punching cards. Climbing to the top of the tower, you can overlook the scenery of Guangzhou in all directions. - ** Danxia Mountain in Shaoguan **: The largest scenic spot in Guangdong, a World Natural Heritage site. It is located in Renhua County, Shaoguan. It is a national 5A tourist attraction and was listed in the World Heritage List in 2010. The scenic spot is featured by Red Cliff Danxia Mountain. It has the reputation of "color like Wodan, bright like Mingxia". The scenic area is large and there are many scenic spots. You can enjoy the wonders of Danxia Mountain and feel the divine workmanship of nature. - Seven-Star Rock: It was known as the first wonder of Lingnan. In Zhaoqing City, Guangdong Province, it was named after seven limestone peaks arranged like the Big Dipper in the sky. - ** Yanzhou Island **: Located in Yanzhou Administrative Area, Huangbu Town, Huidong County, Guangdong Province. - ** Millennium Yao Village **: The oldest Yao Village in China, located in the southwest of Liannan County, Qingyuan City, Guangdong Province. It is a national 4A scenic spot, a famous historical and cultural village in China, and one of the ten most beautiful ancient villages in Guangdong Province. - Guangji Bridge: One of the four ancient bridges in China, located outside the east gate of the ancient city of Chaozhou City, Guangdong Province. It spans across the Han River and connects the east and west banks. It is a national 4A scenic spot and is praised by bridge expert Mao Yisheng as "the earliest open-closed bridge in the world". - ** Guangzhou Changlong Resort **: Located in Hanxi Avenue, Panyu District, Guangzhou, it is the largest comprehensive tourist destination in Guangzhou. The area of the park is huge and includes many theme parks. You can enjoy the five theme parks in one stop and have many entertainment programs. - ** Wutong Mountain **: Located in the eastern part of the Guangdong Province's Special economic zone, it is a rare natural scenic spot located in the urban area with coastal mountains and natural vegetation as the main landscape. - ** Window of the World **: Located at No. 9037 Shennan Avenue, Nanshan District, Nanshan - ** Happy Valley in Shen Zhen **: Located at No. 18, West Street, Qiaocheng, Nanshan District, Shen Zhen, it is a modern theme park that combines participation, viewing, entertainment, and fun. The park is divided into nine theme areas and has more than 100 amusement projects. - ** Guangzhou Shamian Building Complex **: Located on Shamian Island on the bank of White Goose Pond in the Pearl River in Liwan District, Guangzhou, it became the Anglo-French concession in the 11th year of Xianfeng of Qing Dynasty. Most of the existing buildings have obvious western architectural style and characteristics, and also have the characteristics of Chinese architecture. It is a witness to the semi-feudal and semi-colonial history. Had he not watched enough of Long Lovesickness 2? Hurry up and read the original work of " Everlasting Lovesickness 2: A Vow of Love "!

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The Ministry of Education clearly stipulated that the first and second grades of primary school could not have paper final exams, but in reality, some schools might not fully abide by this rule. As for the English exam questions, the reference materials provided examples of the second-year English final review paper and the second-year English final exam paper. They included questions such as single-choice, connecting lines, fill-in-the-blank, etc. The content covered letters, words, simple sentence comprehension and application, etc. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>

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