Traditional Culture Encyclopedia - Weather inquiry - People's Daily Online, Beijing, April 2 "In March, there were three sandstorms in northern China (the most in the same period in 52 years). Since this year, it has appeared all over the country.
People's Daily Online, Beijing, April 2 "In March, there were three sandstorms in northern China (the most in the same period in 52 years). Since this year, it has appeared all over the country.
People's Daily Online, Beijing, April 2 "In March, there were three sandstorms in northern China (the most in the same period in 52 years). Since this year, it has appeared all over the country.(1) petroleum
(2)① Replacement ②? 1: 1
(3)①N:H= 14:3
②4NH 3+3O 2·6h2o+2N 2
Test analysis: (1) Oil can be refined into gasoline, kerosene and diesel, so the answer is oil.
(2)① According to the legend on the right, A is carbon (C), B is water (H 2 O), C is carbon monoxide (CO) and D is hydrogen (H 2), so the reaction can be expressed as: C+H 2 O=CO+H 2. According to the definition of various chemical reaction types, it is a displacement reaction. ② It is not difficult to see from the chemical equation that the molecular number ratio of the reaction product is 1: 1.
(3)① According to the meaning of chemical formula, the mass ratio of nitrogen to hydrogen in NH 3 is (14×1): (1× 3), that is, n: h = 14: 3? ② This is information equation writing. To write such an equation, we must first determine the reactants, reaction conditions and products, and then balance them. According to the law of conservation of mass, the products after combustion must contain nitrogen and hydrogen, and the title reminds us that "the products of combustion are not polluted", so it is easy to infer that the products of combustion should be nitrogen and water. It must be noted that, generally speaking, combustion requires oxygen to participate in the reaction. So the answer is 4NH3+3O26H2O+2N2.
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People's Daily Online, Beijing, April 2 "In March, there were three sandstorms in northern China (the most in the same period in 52 years). Since this year, it has appeared all over the country.
(1) petroleum
(2)① Replacement ②? 1: 1
(3)①N:H= 14:3
②4NH 3+3O 2·6h2o+2N 2
Test analysis: (1) Oil can be refined into gasoline, kerosene and diesel, so the answer is oil.
(2)① According to the legend on the right, A is carbon (C), B is water (H 2 O), C is carbon monoxide (CO) and D is hydrogen (H 2), so the reaction can be expressed as: C+H 2 O=CO+H 2. According to the definition of various chemical reaction types, it is a displacement reaction. ② It is not difficult to see from the chemical equation that the molecular number ratio of the reaction product is 1: 1.
(3)① According to the meaning of chemical formula, the mass ratio of nitrogen to hydrogen in NH 3 is (14×1): (1× 3), that is, n: h = 14: 3? ② This is information equation writing. To write such an equation, we must first determine the reactants, reaction conditions and products, and then balance them. According to the law of conservation of mass, the products after combustion must contain nitrogen and hydrogen, and the title reminds us that "the products of combustion are not polluted", so it is easy to infer that the products of combustion should be nitrogen and water. It must be noted that, generally speaking, combustion requires oxygen to participate in the reaction. So the answer is 4NH3+3O26H2O+2N2.
- Previous article:Qinzhou is very hot.
- Next article:Does it snow in Changsha in January? Traffic conditions in the icy section of Changsha traffic control
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