Thursday, May 12, 2011

Tindak Balas Logam Alkali dengan Udara dan Air

Video ini menunjukkan tindak balas logam alkali dalam Kumpulan 1 dengan udara dan air. Daripada tindak balas ini, kereaktifan logam alkali bertambah apabila menuruni kumpulan.

Video ini juga menunjukkan bahawa logam alkali boleh dipotong dan berbentuk pepejal.

The science

The alkali metals are the elements Lithium, Sodium, Potassium, Rubidium, Caesium and Francium. They are grouped together because they all behave similarly (except with different ferocity) and together form Group 1 of the Periodic Table.

They are in fact very soft metals that can be cut with a knife and have relatively low melting temperatures. They do not occur naturally because they react readily with air and moisture and so need to be stored under oil.

One of the signature reactions of alkali metals is their reaction with water to form alkaline solutions, for example sodium reacts with water to form sodium hydroxide – caustic soda.

The reaction of alkali metals with water is pretty vigorous and as we see in the video clip as we go down Group 1 of the Periodic Table, from Lithium to Caesium, things get more and more frightening.

Lithium is used to make rechargeable batteries and lightweight alloys. Some of its compounds are used as mood stabilising drugs.

Sodium (vapour) is used in bright yellow street lights. It is also used as a heat transfer agent in some types nuclear reactor. Sodium salts are essential to life – ordinary table salt is sodium chloride.

Potassium salts are used as fertilisers, such as potassium chloride which used to be called chloride of potash. Potassium nitrate is one of the components of gunpowder. Potassium salts are also essential to life.

Rubidium and Caesium have a number of specialist uses such as the use of Caesium in atomic clocks that are very accurate and Rubidium, used in specialist glasses. Francium is an extremely rare metal mainly because it readily undergoes radioactive decay with a half life of less than 22 minutes.


  1. Inspiring quest there. What occurred after?


    My web page :: more

  2. Hello! Do you know if they make any plugins to help with SEO?
    I'm trying to get my blog to rank for some targeted keywords but I'm not seeing very good gains.
    If you know of any please share. Kudos!

    Feel free to visit my blog:
    my webpage: see More

  3. obviously like your website but you need to test the spelling on quite a few of your posts.
    Several of them are rife with spelling problems and I to
    find it very troublesome to tell the reality however I'll certainly come back again.

    Look into my blog :: Homepage
    Also see my site - What does the term hot MILF stand for

  4. What a information of un-ambiguity and preserveness of precious
    knowledge on the topic of unexpected feelings.

    Also visit my web blog - a porn tube
    Also see my web page :: see more

  5. These are genuinely great ideas in on the topic of blogging.
    You have touched some fastidious points here. Any way keep up wrinting.

    Here is my web page 에베소서 강해 - 에베소서(10) 2:19-22 주 안에서 성전이 되어가고

  6. If you decide to pursue SEO as a way to generate revenue, you must beware that you will open yourself up to a host of new
    scam products. And if you find out something entertaining on internet you will feel as if you are at the top of the world.
    Of course, this is just the public face of the flap between two not disinterested parties.

    Here is my weblog ::
    Also see my website > visit the next web site

  7. I do trust all of the concepts you have presented
    for your post. They're really convincing and will certainly work. Nonetheless, the posts are very brief for beginners. May just you please prolong them a little from next time? Thank you for the post.

    my blog ... Skip Navegação

  8. Hi there this is kind of of off topic but I was wondering if blogs use WYSIWYG editors or if you have to
    manually code with HTML. I'm starting a blog soon but have no coding know-how so I wanted to get advice from someone with experience. Any help would be greatly appreciated!

    Have a look at my website :: from nubiles charlotte reed

  9. Oh my goodness! Impressive article dude! Many thanks, However I am experiencing issues with your RSS.
    I don't know why I am unable to join it. Is there anyone else having identical RSS problems? Anybody who knows the answer will you kindly respond? Thanks!!

    my web page

  10. Thank you, I've just been looking for info approximately this topic for ages and yours is the best I have discovered so far. But, what in regards to the conclusion? Are you certain in regards to the source?

    Here is my web blog; See more

  11. I'm really enjoying the design and layout of your blog. It's a very
    easy on the eyes which makes it much more pleasant for
    me to come here and visit more often. Did you hire out a designer to create your theme?
    Great work!

    Also visit my webpage; or Vintage Wife Movies

  12. Hi to all, it's actually a pleasant for me to pay a quick visit this web page, it consists of valuable Information.

    Feel free to visit my blog - Visit Website

  13. Hi there i am kavin, its my first occasion to commenting anywhere, when i read this paragraph i
    thought i could also make comment due to this sensible article.

    Also visit my weblog - mouse click the following web page

  14. Greetings from California! I'm bored to death at work so I decided to check out your site on my iphone during lunch break. I love the info you present here and can't wait to take a
    look when I get home. I'm surprised at how quick your blog loaded on my phone .. I'm not even using WIFI,
    just 3G .. Anyways, very good blog!

    My blog post - avis 24option

  15. Paragraph writing is also a fun, if you be acquainted with
    afterward you can write or else it is complex
    to write.

    Check out my homepage:

  16. Admiring the hard work you put into your site and in depth information you provide.
    It's good to come across a blog every once in a while that isn't the same unwanted rehashed material.
    Great read! I've bookmarked your site and I'm including your
    RSS feeds to my Google account.

    Feel free to surf to my webpage click this

  17. Aside from being hypoallergenic, this oil has the ability to stimulate the skin and repair damage.

    Again, be careful when using the vinegar as some people may have an unpleasant reaction to
    the acid in the vinegar. It is an organ of elimination
    which proceeds too many of the waste-products which have been produced as a result of bodily processes in sweat through the pores.

    Have a look at my web blog; beauty

  18. Terrific post however I was wanting to know if you could
    write a litte more on this topic? I'd be very grateful if you could elaborate a little bit further. Many thanks!

    Visit my blog :: breaking news

  19. Good day! This is my 1st comment here so I just wanted
    to give a quick shout out and tell you I genuinely enjoy reading your blog posts.
    Can you recommend any other blogs/websites/forums that deal with the same subjects?

    Appreciate it!

    Feel free to surf to my homepage - see more

  20. Thank you a lot for sharing this with all people you actually
    realize what you are talking approximately! Bookmarked.
    Please also visit my web site =). We may have a link change arrangement between us

    my site - A Porn Actress

  21. This is a topic that's near to my heart... Many thanks! Exactly where are your contact details though?

    Here is my web-site - Email Console

  22. Hey there just wanted to give you a quick heads up. The words in your content seem to be running off the screen in Safari.
    I'm not sure if this is a format issue or something to do with browser compatibility but I thought I'd post to let
    you know. The style and design look great though! Hope
    you get the issue resolved soon. Many thanks

    Feel free to visit my web-site

  23. Your mode of explaining all in this article is actually nice,
    all can without difficulty be aware of it, Thanks a lot.

    Also visit my web-site; old fucker does a horny brunette teen in a dressing room

  24. you're actually a good webmaster. The web site loading velocity is amazing. It sort of feels that you are doing any distinctive trick. Furthermore, The contents are masterwork. you've
    performed a magnificent activity in this matter!

    Feel free to surf to my weblog :: MartyMusg's Profile - MyDocShare - Document Sharing Script

  25. Does your blog have a contact page? I'm having trouble locating it but, I'd like to send you an
    email. I've got some suggestions for your blog you might be interested in hearing. Either way, great website and I look forward to seeing it improve over time.

    Feel free to surf to my web site - more

  26. What's up Dear, are you actually visiting this web site regularly, if so then you will absolutely take fastidious knowledge.

    My web page: top article

  27. Simply desire to say your article is as amazing.
    The clarity in your post is just cool and i could assume you are an expert on this subject.
    Well with your permission allow me to grab your feed to keep updated with forthcoming post.
    Thanks a million and please keep up the gratifying work.

    Here is my blog post ::