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Monday, April 12, 2010
alkalines~

hello again. :D
this is a continuation of acids, the previous post.
keep on reading and tagging! :D

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alkalines ; properties

> they are bitter
> they have a soapy feel
> they turn red litmus paper blue

'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

uses of alkalines;

> ammonia solution : fertilisers
>sodium lydroxide : soaps & alternatives
> calcium hydroxide or lime water : reduce acidity of soil in agriculture

* neutralisaton – mixing acids and alkalines

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important equation ;

Acid + Alkali = Salt + Water

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indicators :

* red & blue litmus paper
* methyl orange ; test for acids
* phenolpthalein ; test for alkalines
* universal indicator

it turns red in PH range of 0 – 3

it turns yellow in PH range of 4 – 14

it turns colourless in PH range of 1 – 9

it turns red in PH range of 10 – 14

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done by : qihui and julia :D
edited by : syak :D


~ { 2:34 AM }
DOMO-KUN is <3

Thursday, April 8, 2010
acids~

hello!
this is what we have learnt many things for science.
acids are one of them.
lai, let me tell you more about them ^^

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these are labels that you usually see in science laboratories ;





















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acids ; properties

> tastes sour example. lemon and lime.
> turns blue litmus paper red
> reacts with some metals & give off hydrogen.
> when dilute sulfuric or hydrochloric acid is added to a test tube containing
pieces of magnesium, a lot of bubbles are given off.
this is called effervescene (bubbles). the bubbles produced contain
hydrogen gas. we can also test it by using a burning splint.
if it is inserted into the gas, the splint extinguishes with a ‘pop’ sound.

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important equations ;

Acid + Metal = Salt +Hydrogen

Acid + Carbonate = Salt + Water + Carbon Dioxide

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uses of acids ;

Hydrochloric Acid : remove rust on iron & steel

Sulfuric Acid : used in car batteries

Nitric Acid : manufacture fertilisers

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done by : [collaboration of information by] qihui & julia :D
edited by : syak :D

P.S. information about alkalines are in the next post. click it! :D

~ { 2:41 AM }
DOMO-KUN is <3

Wednesday, April 7, 2010
` introduction.

hello earthlings. :D
this is thefiveminutes's science blog. more entries will be coming soon.
tag us, not spam.
leave nothing but hellos, take nothing but knowledge.
our group consists of Ghadaffi, our chairman + leader,
Kaiyuan,
Qihui, the hardworking one,
Julia,
& lastly, Syakirah. :D
we thank mr raj, our science teacher for the idea of the science blog. :D
okay, more science updates will be coming soon.

` syak. :D


~ { 3:35 AM }
DOMO-KUN is <3