Can oil and water mix?

Mixing Oil and Water Some things just don't get along well with each other. Take oil and water as an example, you can mix them together and shake as hard as you like but they'll never become friends.....or will they? Take this fun experiment a step further and find out how bringing oil and water together can help you do your dishes.  What you'll need: Small soft drink bottle Water Food colouring 2 tablespoons of cooking oil Dish washing liquid or detergent Instructions: Add a few drops of food colouring to the water. Pour about 2 tablespoons of the coloured water along with the 2 tablespoons                               of cooking oil into the small soft drink bottle. Screw the lid on tight and shake the bottle as hard as you can. Put the bottle back down and have a look, it may have seemed as though                                the liquid were mixing together but the oil will float back to the top. What's happening? While water often mixes with other liquids to form solutions, oil and water does not. Water molecules are strongly attracted to each other, this is the same for oil, because they are more attracted to their own molecules they just don't mix together. They separate and the oil floats above the water because it has a lower density. If you really think oil and water belong together then try adding some dish washing liquid or detergent. Detergent is attracted to both water and oil helping them all join together and form something called an emulsion. This is extra handy when washing those greasy dishes, the detergent takes the oil and grime off the plates and into the water, yay!

What can we do with potassium nitrate(saltpeter) ?

Salah satu ciptaan yang boleh kita buat menggunakan potassium nitrate, KNO3 ialah bom asap.

Bahan-bahan :

- potassium nitrate, KNO3 

- gula

Cara-cara :

Campurkan 3 bahagian KNO3 dan 2 bahagian gula ke dalam satu bekas. Berat untuk bahan anda adalah ikut kesesuaian sendiri. Contohnya, 60 gram KNO3 dan 40 gram gula ataupun 30 gram KNO3 dan 20 gram gula. 

Masukkan campuran tersebut ke dalam sebuah kuali leper atau kuali biasa. Panaskan campuran tersebut menggunakan api yang perlahan.

Gaul bahan tersebut secara sekata (untuk mengelakkan bahan di permukaan kuali daripada terbakar). Gaulkan sehingga campuran tersebut cair dan bertukar warna keperang-perangan.

Teruskan menggaul. Berhenti menggaul apabila cairan tersebut menjadi likat dan kering. 

Pindahkan bahan tersebut daripada kuali ke atas aluminium foil. 

Bentukkan bahan tersebut mengikut citarasa anda.

Bakar bahan tersebut di atas sehelai surat khabar dan ambil jarak untuk keselamatan. (lakukan ini di luar rumah anda)

Selamat mencuba !

Kalau anda berminat untuk mencuba, boleh dapatkan potassium nitrate,KNO3 melalui admin (0174779217 ).. 

Ni ada video bom asap..

http://www.youtube.com/watch?v=-rV4voz3its