thanhatbu_13
04-04-2009, 02:20 PM
Để tạo hứng thú cho các bạn học hoá, vui cùng dân chemvn . Mình mở 1 topic thảo luận về các thí nghiệm hoá học vui có thể tiến hành cùng các bạn học sinh và thầy cô, mong sự tham gia, đóng góp ý xây dựng để chúng ta có các buổi ngoại khoá về Hoá học có ý nghĩa.
Đối tượng tiến hành: các bạn học sinh cấp 3, sinh viên.
Lưu ý các bạn nên đọc và nắm thật chắc lý thuyết trước khi tiến hành thí nghiệm.
Thí nghiệm 1: Núi tạo bọt.
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mso-list-type:hybrid; mso-list-template-ids:-1608477298 69861395 69861401 69861403 69861391 69861401 69861403 69861391 69861401 69861403;} @list l1:level1 {mso-level-number-format:roman-upper; mso-level-tab-stop:none; mso-level-number-position:right; text-indent:-18.0pt;} ol {margin-bottom:0cm;} ul {margin-bottom:0cm;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Arial","sans-serif"; mso-bidi-font-family:"Times New Roman";} </style> <![endif]--> <!--[if !supportLists]-->I.Phản ứng của H2O2 (27-33%) với dung dịch KMnO4
<!--[endif]--> Dụng cụ cần
<!--[if !supportLists]-->·<!--[endif]-->bình cầu 2 cổ kích thước lớn hoặc chai nước ngọt
ống dẫn nước , loại dùng trong xây dựng , đường kính 1-2 cm cái này bạn kiếm ở chỗ bán đồ vật liệu xây dựng.
Keo đốt nóng dán nhựa.
1 cái phểu nhỏ vừa ống trên
<!--[endif]-->dung dịch H2O2 nồng độ khoảng 20-30% mua chơ kim biên
KMnO4 rắn , mua chợ kim biên
Chất tạo bọt Sodium lauryl sulfate SLS hoặc Las , có thể dùng xà phòng cũng được
<!--[if !supportLists]-->·Tiến hành:
Nếu chúng ta dùng chai nước ngọt thì chúng ta cần biến nó thành bình 2 cổ:
Đục 1 cái lỗ nhỏ cách miệng chai 1,5 lít 10-15cm 1 cái lỗ nhỏ, sau đó cho ống dẫn vào lỗ đến tận đáy của cái chai để khi đổ dd H2O2 sẽ tới đáy bình.
Sau đo cho chất dd KMnO4 đậm đặc có thể dư rắn KMnO4 vào chai nước ngọt.
Pha chất tạo bọt LSL hoặc cho 1 ít xà phòng rửa chén vào trong chai ( chú ý quá trình khuếch tán)
2. Nếu là bình cầu 2 cỗ thì quá tốt, cho trực tiếp hoá chất vào bình cầu
SAu đó chúng ta chuẩn bị phễu để cho dung dịch H2O2 vào. và thế là có 1 thành phẩm khá hay....
2KMnO4 + H202 = 2KOH + MnO2 +O2
Đây là sản phẩm của các học trò trong lớp sau khi dùng lần đầu, những lần sau mình cải tiến thành 3-4 núi chai bắn cùng lúc.
Chi phí thực hiện khoảng 50K cho 4-5 lần thực hiện
http://www.youtube.com/watch?v=SIH8bTo_wcM
<!--[if !supportLists]-->·<!--[endif]-->http://chemistry.creighton.edu/Outreach/MMM/wholenewworldvideo.html
http://www.youtube.com/watch?v=085e-ALKmUM&feature=PlayList&p=38049EBC96D9E068&playnext=1&playnext_from=PL&index=39
:rockon ( Những điều chú ý khi làm việc với thí nghiệm
- Hơi bốc ra dễ có oxi dễ xảy ra phản ứng cháy nổ, và có thể bắn vào mắt vì vậy cần phải đeo kính bảo vệ mắt khi làm các thí nghiệm này.
- Để thoát ra màu thì dùng dư KMnO4, không dùng màu hữu cơ, phẩm màu.
Thân.
Đối tượng tiến hành: các bạn học sinh cấp 3, sinh viên.
Lưu ý các bạn nên đọc và nắm thật chắc lý thuyết trước khi tiến hành thí nghiệm.
Thí nghiệm 1: Núi tạo bọt.
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mso-list-type:hybrid; mso-list-template-ids:-1608477298 69861395 69861401 69861403 69861391 69861401 69861403 69861391 69861401 69861403;} @list l1:level1 {mso-level-number-format:roman-upper; mso-level-tab-stop:none; mso-level-number-position:right; text-indent:-18.0pt;} ol {margin-bottom:0cm;} ul {margin-bottom:0cm;} --> </style><!--[if gte mso 10]> <style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Arial","sans-serif"; mso-bidi-font-family:"Times New Roman";} </style> <![endif]--> <!--[if !supportLists]-->I.Phản ứng của H2O2 (27-33%) với dung dịch KMnO4
<!--[endif]--> Dụng cụ cần
<!--[if !supportLists]-->·<!--[endif]-->bình cầu 2 cổ kích thước lớn hoặc chai nước ngọt
ống dẫn nước , loại dùng trong xây dựng , đường kính 1-2 cm cái này bạn kiếm ở chỗ bán đồ vật liệu xây dựng.
Keo đốt nóng dán nhựa.
1 cái phểu nhỏ vừa ống trên
<!--[endif]-->dung dịch H2O2 nồng độ khoảng 20-30% mua chơ kim biên
KMnO4 rắn , mua chợ kim biên
Chất tạo bọt Sodium lauryl sulfate SLS hoặc Las , có thể dùng xà phòng cũng được
<!--[if !supportLists]-->·Tiến hành:
Nếu chúng ta dùng chai nước ngọt thì chúng ta cần biến nó thành bình 2 cổ:
Đục 1 cái lỗ nhỏ cách miệng chai 1,5 lít 10-15cm 1 cái lỗ nhỏ, sau đó cho ống dẫn vào lỗ đến tận đáy của cái chai để khi đổ dd H2O2 sẽ tới đáy bình.
Sau đo cho chất dd KMnO4 đậm đặc có thể dư rắn KMnO4 vào chai nước ngọt.
Pha chất tạo bọt LSL hoặc cho 1 ít xà phòng rửa chén vào trong chai ( chú ý quá trình khuếch tán)
2. Nếu là bình cầu 2 cỗ thì quá tốt, cho trực tiếp hoá chất vào bình cầu
SAu đó chúng ta chuẩn bị phễu để cho dung dịch H2O2 vào. và thế là có 1 thành phẩm khá hay....
2KMnO4 + H202 = 2KOH + MnO2 +O2
Đây là sản phẩm của các học trò trong lớp sau khi dùng lần đầu, những lần sau mình cải tiến thành 3-4 núi chai bắn cùng lúc.
Chi phí thực hiện khoảng 50K cho 4-5 lần thực hiện
http://www.youtube.com/watch?v=SIH8bTo_wcM
<!--[if !supportLists]-->·<!--[endif]-->http://chemistry.creighton.edu/Outreach/MMM/wholenewworldvideo.html
http://www.youtube.com/watch?v=085e-ALKmUM&feature=PlayList&p=38049EBC96D9E068&playnext=1&playnext_from=PL&index=39
:rockon ( Những điều chú ý khi làm việc với thí nghiệm
- Hơi bốc ra dễ có oxi dễ xảy ra phản ứng cháy nổ, và có thể bắn vào mắt vì vậy cần phải đeo kính bảo vệ mắt khi làm các thí nghiệm này.
- Để thoát ra màu thì dùng dư KMnO4, không dùng màu hữu cơ, phẩm màu.
Thân.