第1个回答 2012-09-28
Air compounds.
2 liquid ammonia having a definite boiling point.
The air containing different gases.
4 to heat water to produce water vapor.
5 nitrogen and oxygen having a different melting point.
6 available method of fractionating liquid air to nitrogen and oxygen in air separation.
7 at room temperature and under atmospheric pressure, the copper is solid.
8 can be removed by filtration, the insoluble material in the seawater.
9 with cold water sodium chloride to remove the impurities of the surface of the crystal.
10 flame test, the salt will make a golden yellow flame.
11 when subjected to a flame test, first with concentrated sulfuric acid, then washed with distilled water nichrome wire.
12. The sublimation of iodine is a physical change.
13 calcium carbonate with dilute hydrochloric acid, there will be hydrogen generation.
14 when calcium carbonate is added to dilute hydrochloric acid, burning wood put the recent release of gas, will produce explosive song.
15. Calcium carbonate with dilute hydrochloric acid reaction of soluble calcium chloride.
16 Calcium carbonate is dissolved in dilute hydrochloric acid.
17. Lime will react with carbon dioxide in air to generate calcium carbonate.
18 He should wear safety glasses.
19 oxygen to bring the wood with the remaining embers rekindle.
20 chlorinated water can dry cobalt (II) paper from blue to pink.
21. Tests with wood burning hydrogen will produce explosive song.
22 to prevent the condensation of water in the tube mouth reflux to the hotter part of the tubes, so that the tubes burst.
23 to prevent the liquid inside the test tube Y suck down.
24. The escape of water vapor condensation.
25 B with dilute hydrochloric acid reaction, generating carbon dioxide gas. Carbon dioxide can limewater milky.
26. Limestone will flame brick red to show that it contains calcium.
27 is used to manufacture steel from iron
28 and in the acidity of the soil
29 in the industry as a desiccant
30. Liquid becomes milky generated because there is a water-insoluble calcium carbonate.望采纳!本回答被网友采纳
第2个回答 2012-09-28
1. The air is compound.
2. Liquid ammonia has clear boiling point.
3. Air contains different gas.
(4) the water heating will produce the steam.
5. Nitrogen and oxygen have different melting point.
6. Available fractionation liquid air method in the air to nitrogen and oxygen separation.
7. In normal temperature and pressure, copper is solid.
8. Filter can remove sea water insoluble substance.
9. Use cold water cleaning sodium chloride can remove crystal surface impurities.
10. In flame test, salt can make flame present golden yellow.
11. Flame test, first with concentrated sulfuric acid, garnish with distilled water flushing nichrome wire.
12. The sublimation of iodine is a physical change.
13. Calcium carbonate with dilute hydrochloric acid reaction time, there will be hydrogen generation.
14. The calcium carbonate in dilute hydrochloric acid, the burning strip put it near the gas release, can produce detonation song.
15. Calcium carbonate with dilute hydrochloric acid reaction, generate soluble calcium chloride.
16. Calcium carbonate can soluble in dilute hydrogen in chlorate.
17. Lime water and carbon dioxide from the air reaction to produce calcium carbonate.
18. He should wear safety glasses.
19. Oxygen can refer to rest out strip reignition.
20. The water dry cobalt (II) chloride paper from blue to pink.
21. With burning strip test hydrogen, will produce the detonation song.
22. In a test tube to prevent the mouth of condensation water back into the test tube of the hotter part, make the test tube burst.
23. Prevent tube Y in liquid appears, pour suction.
24. The escaped water vapor condensation.
25. B with dilute hydrochloric acid reaction to produce carbon dioxide gas. Carbon dioxide can put whitewash become milky white.
26. Limestone can make flame a brick red, show that it contains calcium.
27. Used for manufacturing steel from iron
28. Neutral soil acid
29 in industry as a drying agent
30. Liquid into ivory because there is no water soluble calcium carbonate formation.
第3个回答 2012-10-06
1 Air compounds.
2 liquid ammonia having a definite boiling point.
The air containing different gases.
4 to heat water to produce water vapor.
5 nitrogen and oxygen having a different melting point.
6 available method of fractionating liquid air to nitrogen and oxygen in air separation.
7 at room temperature and under atmospheric pressure, the copper is solid.
8 can be removed by filtration, the insoluble material in the seawater.
9 with cold water sodium chloride to remove the impurities of the surface of the crystal.
10 flame test, the salt will make a golden yellow flame.
11 when subjected to a flame test, first with concentrated sulfuric acid, then washed with distilled water nichrome wire.
12. The sublimation of iodine is a physical change.
13 calcium carbonate with dilute hydrochloric acid, there will be hydrogen generation.
14 when calcium carbonate is added to dilute hydrochloric acid, burning wood put the recent release of gas, will produce explosive song.
15. Calcium carbonate with dilute hydrochloric acid reaction of soluble calcium chloride.
16 Calcium carbonate is dissolved in dilute hydrochloric acid.
17. Lime will react with carbon dioxide in air to generate calcium carbonate.
18 He should wear safety glasses.
19 oxygen to bring the wood with the remaining embers rekindle.
20 chlorinated water can dry cobalt (II) paper from blue to pink.
21. Tests with wood burning hydrogen will produce explosive song.
22 to prevent the condensation of water in the tube mouth reflux to the hotter part of the tubes, so that the tubes burst.
23 to prevent the liquid inside the test tube Y suck down.
24. The escape of water vapor condensation.
25 B with dilute hydrochloric acid reaction, generating carbon dioxide gas. Carbon dioxide can limewater milky.
26. Limestone will flame brick red to show that it contains calcium.
27 is used to manufacture steel from iron
28 and in the acidity of the soil
29 in the industry as a desiccant
30. Liquid becomes milky generated because there is a water-insoluble calcium carbonate.