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f.3 chem
發問:
topics: physical and chemical properties, physical and chemical changes, making compounds from elements1. reaction (e.g. with glowing splint / with lime water) 係physical properties定係chemical properties?2. appearance (e.g. silvery gray solid, colourless gas, white solid powder)係physical properties定係chemical... 顯示更多 topics: physical and chemical properties, physical and chemical changes, making compounds from elements 1. reaction (e.g. with glowing splint / with lime water) 係physical properties定係chemical properties? 2. appearance (e.g. silvery gray solid, colourless gas, white solid powder)係physical properties定係chemical properties? 3. eletrical conductivity (e..g. conductor, insulator)係physical properties定係chemical properties? 4. alkali同base有咩分別？ 5. iron同iron(II)有咩分別？ 6. effect of magnet係physical properties定係chemical properties? 7. 形容float同sink係physical properties定係chemical properties? 8. 加水e個動作係physical properties定係chemical properties? 9. observable change係physical properties定係chemical properties? 10. lead同lead(II)有咩分別？ 11. test with a burning splint (e.g. burns more bright in oxygen)係physical properties定係chemical properties? 12. test with blue cobal chloride paper (e.g. turns blue from pink in water)係physical properties定係chemical properties? 13. 舉d physical change同chemical change. 識幾多就答幾多la 唔一定要答晒 thx 更新: thx very much 想問多1題： 14. carbon dioxide turns colourless lime water milky係physical property定係chemical property?
1.chemical properties 2.physical properties 3.physical properties 5.iron = charged +1, iron(ll) = charged +2 7.physical properties 9.chemical properties 10.lead = charged +1, lead(ll) = charged +2 11.chemical properties 12.chemical properties 2011-10-01 23:24:29 補充： 13. physical:metals are malleable, copper is ductile, wood is bad conductor of heat chemical: an effervescent tablet reacts with water quickly to realease bubbles of carbon dioxide.
其他解答:
14. chemical property reason: Ca(OH)2+CO2 = CaCO3+H2O it becomes calcium carbonate.|||||5. iron 同 iron (II) 既分別就係 iron(ll) 係iron 既ion which mean the total number of electrons is not equal to the number of protons. This give an overall 2+ charge electrons in its shell Same with question 10.
f.3 chem
發問:
topics: physical and chemical properties, physical and chemical changes, making compounds from elements1. reaction (e.g. with glowing splint / with lime water) 係physical properties定係chemical properties?2. appearance (e.g. silvery gray solid, colourless gas, white solid powder)係physical properties定係chemical... 顯示更多 topics: physical and chemical properties, physical and chemical changes, making compounds from elements 1. reaction (e.g. with glowing splint / with lime water) 係physical properties定係chemical properties? 2. appearance (e.g. silvery gray solid, colourless gas, white solid powder)係physical properties定係chemical properties? 3. eletrical conductivity (e..g. conductor, insulator)係physical properties定係chemical properties? 4. alkali同base有咩分別？ 5. iron同iron(II)有咩分別？ 6. effect of magnet係physical properties定係chemical properties? 7. 形容float同sink係physical properties定係chemical properties? 8. 加水e個動作係physical properties定係chemical properties? 9. observable change係physical properties定係chemical properties? 10. lead同lead(II)有咩分別？ 11. test with a burning splint (e.g. burns more bright in oxygen)係physical properties定係chemical properties? 12. test with blue cobal chloride paper (e.g. turns blue from pink in water)係physical properties定係chemical properties? 13. 舉d physical change同chemical change. 識幾多就答幾多la 唔一定要答晒 thx 更新: thx very much 想問多1題： 14. carbon dioxide turns colourless lime water milky係physical property定係chemical property?
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最佳解答:1.chemical properties 2.physical properties 3.physical properties 5.iron = charged +1, iron(ll) = charged +2 7.physical properties 9.chemical properties 10.lead = charged +1, lead(ll) = charged +2 11.chemical properties 12.chemical properties 2011-10-01 23:24:29 補充： 13. physical:metals are malleable, copper is ductile, wood is bad conductor of heat chemical: an effervescent tablet reacts with water quickly to realease bubbles of carbon dioxide.
其他解答:
14. chemical property reason: Ca(OH)2+CO2 = CaCO3+H2O it becomes calcium carbonate.|||||5. iron 同 iron (II) 既分別就係 iron(ll) 係iron 既ion which mean the total number of electrons is not equal to the number of protons. This give an overall 2+ charge electrons in its shell Same with question 10.
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