The density of paraffin, ice and vegetable oil ranges from 0.09 g / cm3 to 0.92 g / cm3?

The liquid is vegetable oil, the softer solid is paraffin, and the harder solid is ice. In addition to density, hardness, color, state at room temperature and melting point are all characteristics of objects, which can be used to judge the types of objects, but they are not the only basis. Sometimes they need to be considered comprehensively

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1. Lithium is stored in paraffin. Is paraffin liquid or solid? What is the density of paraffin
2. A hollow aluminum ball with a mass of 270g Put into the water suspension, find: 1, aluminum ball received buoyancy 2. The total volume of hollow aluminum spheres 3. The volume of the solid part of the aluminum ball What is the buoyancy of putting a solid aluminum block with a volume of 0.02m3 into mercury Ask less
3. The mass of a hollow aluminum ball is 27g. After the hollow part is filled with alcohol, the total mass is 43g? (ρ aluminum = 2.7 × 103 kg / m3, ρ alcohol = 0.8 × 103 kg / m3)
4. The volume of aluminum is 400cm3 and the mass is 810g. Is the ball hollow or solid? What is the volume of Wilbur hollow? I know. Let's talk
5. An aluminum ball has a mass of 810g and a volume of 400cm ^ 3. Is it hollow? (p aluminum = 2.7 * 10 ^ 3kg / m ^ 3) (please answer in three ways)
6. The mass of a hollow aluminum ball is 27g. After the hollow part is filled with alcohol, its total mass is 51g. The volume of the aluminum ball is calculated. (the density of the aluminum ball is 2.7 × 103kg / m3, and the density of the alcohol is 0.8 × 103kg / m3)
7. The mass of a 50cm 3 aluminum ball is 54G. Is the aluminum ball hollow or solid? If it is hollow, how large is the volume of the hollow part? The mass of a 50cm ^ 3 aluminum ball is 54G. Is the aluminum ball hollow or solid? If it is hollow, what is the volume of the hollow part? If it is filled with water, how much water can it hold? (p aluminum = 2.7 × 10 cubic kg | m3) I'm so anxious! How can the devil hurt me so much! So slow. I'm so angry-
8. A 54G aluminum ball has a volume of 30cm3. Is the aluminum ball solid? If it is hollow, what is the volume of the hollow part?
9. For a 100 cubic centimeter aluminum block (ρ = 2.7 × 10 cubic kilogram per cubic meter), half of it is immersed in water. What is the buoyancy it receives What is wrong with multiplying the density of aluminum block by G and then multiplying the volume of aluminum block
10. A piece of aluminum, the volume is 0.05 cubic meters, immersed in alcohol by buoyancy is
11. The density of salt water is 1.1g/cm3. In order to test whether the prepared salt water meets the requirements, 500ml salt water sample is taken, and its mass is 0.6kg. Please analyze whether such salt water meets the requirements. If not, how much salt or water should be added per 500ml of the original salt water?
12. Salt water seed selection is a kind of seed selection method invented by the working people in China. At present, salt water with density of 1.1 × 10 ~ 3 kg / M ~ 3 is needed. If the quality of 0.6 DM3 salt water is 540 G (1) Please calculate whether the brine meets the requirements? (2) If not, should salt or water be added? How many kg?
13. In salt water selection, salt water with density of 1.1x10 ^ 3kg / m ^ 3 is needed In the selection of salt water, salt water with a density of 1.1x10 ^ 3kg / m ^ 3 is needed. A student prepared 350ml salt water, and the quality of the salt water is 0.6kg. Ask whether the salt water meets the requirements? If not, how much water or salt should be added? Especially the process of how much to add!
14. Dilute 98% (density 1.84 g / cm3) concentrated sulfuric acid to 4 mol / L dilute sulfuric acid 250 ml, how many ml of concentrated sulfuric acid are taken
15. Dilute concentrated sulfuric acid with 18.4 mol / L concentration and 18.4 g / cm * 3 density to 1 000 ml, 2 mol / L concentration and 1.2 g / cm * 3 density Dilute 18.4 mol / L concentrated sulfuric acid with density of 18.4 g / cm * 3 to 1000 ml, 2 mol / L concentrated sulfuric acid with density of 1.2 g / cm ^ 3. Calculate: 1. Volume of concentrated sulfuric acid required; 2. Volume of water required
16. To prepare 200 grams of 20% dilute sulfuric acid with 98% concentrated sulfuric acid (density 1.84 g / cm3), how many ml of concentrated sulfuric acid and water are needed Company
17. A factory uses 98% concentrated sulfuric acid (density is 1.84 g / cm3) to prepare 30% dilute sulfuric acid for production. The volume ratio of concentrated sulfuric acid to water is the closest to () A. 1：3B. 1：4C. 1：5D. 1：6
18. At present, concentrated H2SO4 with a mass fraction of 98% and a density of 1.84 g / cm3 is diluted to 500 ml dilute sulfuric acid with a mass concentration of 9.2 mol / L (1) How many ml of 98% concentrated sulfuric acid do you need? (2) If 100ml is taken out of 500ml, what is the concentration of the substance in the solution? What is the concentration of H + substance? If 100ml dilute sulfuric acid is taken out and reacted with enough zinc particles, how much hydrogen can be produced under standard conditions?
19. How to measure the density of brine
20. When 1000ml salt water is collected, the weight is 1.05kg, and the known density of salt is 2.7g/cm ^ 3