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The main component of coal is carbon. Why is the coal ash left after burning in the air much lighter than coal?
Because carbon turns into carbon dioxide and flies away, leaving only ash,
Of course, it's light
The main component of coal is carbon. Why is the mass of coal ash left after burning in air much lighter than that of coal
Some of the carbon reacts with oxygen to form carbon dioxide, which escapes into the air and causes light weight. If carefully considered, a small amount of sulfur and other combustible materials will burn
There are 13 tons of apples, 2 tons and 3 tons of trucks, and the freight is 140 yuan and 200 yuan respectively. How to arrange the cost of vehicles at least? What are the five methods
This is the most common method. Considering the price, you will know that 3-ton trucks are 10 yuan cheaper than 2-ton trucks. It's a very simple mathematical problem. 3-ton trucks transport 9 tons and 2-ton trucks transport 2 times. 880 yuan is the cheapest. Of course, there are many methods, but the price is the cheapest
What is the maximum carrying capacity of Toyota Corolla?
400 kg
RELATED INFORMATIONS
- 1. When several 8-ton trucks are used to transport goods, each truck is only loaded with 5 tons, and the remaining 10 tons are loaded with 8 tons, the last truck is not empty. How many trucks are there If the number of unsatisfied non empty fingers does not reach the specified number, the non empty fingers are greater than zero
- 2. There are 100 trucks in a transport team, of which 25 are small trucks and the rest are large trucks. How many times are large trucks compared with small trucks?
- 3. Load 1200 kg of goods into the truck. The truck weighs 1 / 4 more than the truck. What is the truck weight
- 4. The carrying capacity of a certain ship is 260 tons, and the volume of its cargo hold is 1000 cubic meters. There are two kinds of goods (A and b) to be transported, of which the volume of a cargo is 8 cubic meters per ton, and that of B cargo is 2 cubic meters per ton. If we want to make full use of the carrying capacity and cargo hold volume of the ship, how many goods should be loaded in each of them?
- 5. One ship has a deadweight of 520 tons and a cargo hold volume of 2000 cubic meters. Now it is carrying two kinds of goods, Party A and Party B, with a cargo volume of 2 cubic meters per ton, Now we are shipping two kinds of goods, one is 2 cubic meters per ton, and the other is 8 cubic meters per ton. How many tons of the two kinds of goods can we make the best use of the ship's carrying capacity and carrying capacity
- 6. Ship a is at a. ship B is at B, 20 nautical miles south of ship A. ship B is heading due north at a speed of 10 nautical miles per hour, while ship a is heading 60 ° south by West from a at a speed of 8 nautical miles per hour. After how many hours, is the nearest distance between ship a and ship B?
- 7. The cargo carrying capacity of vessel a is 25% more than that of vessel B. the total cargo carrying capacity of vessel a and B is 1800 tons. How many tons of cargo are each carried by vessel a and B?
- 8. The cargo carrying capacity of vessel a is 25% more than that of vessel B. the total cargo carrying capacity of vessel a and B is 3600 tons?
- 9. The distance between port a and port B is 1200 km. Ship a sails from port a to port B at 60 km per hour. 30 minutes after the departure of ship a, ship B sails from port B to port a at 70 km per hour. How many hours after the departure of ship B?
- 10. The distance between port a and port B is 120 km. Ship a sails 60 km per hour from port a to port B. after 30 minutes, please thank you Ship B sails from port B to port a, traveling 70 kilometers per hour. How many hours after the departure of ship a, the two ships meet?
- 11. After coal combustion, it turns into more coal ash with small mass, which indicates that the reaction of coal combustion does not conform to the law of conservation of mass When carbon is burned in oxygen, the mass of carbon dioxide produced is larger than that of carbon participating in the reaction If you use OCO to represent carbon dioxide, please use the diagram to show the chemical reaction of carbon dioxide and carbon to produce carbon monoxide
- 12. Every 12 phr of carbon reacts completely with 32 phr of oxygen to produce 44 phr of carbon dioxide What does the complete response mean
- 13. Calculate the mass of carbon dioxide with 12g carbon Now, help me answer. There's an extra reward
- 14. According to the chemical formula of carbon dioxide: the mass ratio of carbon and oxygen in carbon dioxide, the mass fraction of each element in carbon dioxide How many grams of carbon are contained in 11 grams of CO2? How much carbon dioxide can contain 6 grams?
- 15. The mass ratio of carbon monoxide to carbon dioxide is 2:1, and the mass ratio of carbon element in them is 0______ The number ratio of molecules is______ ．
- 16. Take 2.16 g of the material and make it burn fully. It is measured that only 2.16 g of hydrated carbon dioxide and 5.28 g of carbon dioxide are produced. How much hydrogen and carbon are contained in the material ,
- 17. After a substance is fully burned in oxygen, it will produce carbon dioxide and water. The substance must contain carbon and hydrogen. It may contain oxygen. Why
- 18. Coal is an important chemical raw material. Using coal as fuel is not only a great waste, but also because coal contains sulfur, the sulfur dioxide generated after combustion will cause air pollution. 1% of sulfur-containing coal is directly burned and discharged without treatment. Four tons of sulfur dioxide gas is discharged into the atmosphere every day. How many tons of coal is burned in this plant every day
- 19. There is a kind of organic matter, 23g, which is completely burned in the air to generate 44g of carbon dioxide and 27g of water. What is the mass of carbon element in the organic matter? What is the mass of hydrogen?
- 20. In order to judge whether a compound contains carbon, hydrogen and oxygen, a certain mass of the compound should be fully burned in oxygen. The following experiments are needed: (1) using anhydrous copper sulfate to check whether there is water formation; (2) using clear lime water to check whether there is carbon dioxide formation; (3) using wood strips with Mars to check oxygen; (4) determining the mass of water and carbon dioxide A. ①②③B. ①②④C. ②③④D. ①②③④