menghitung hari peperiksaan~

salam imtihan buat sahabat2


                                          

selamat berjuang
formula cemerlang..

"al mukminun"

wallahualam~

doa peperiksaan

alhamdulillah
 sekarang dah masuk minggu ke-13 rupanye
rasa cam baru je masuk semester 3,,

sekarang ni masih lagi dalam menyiapkan assignment yg belum siap..
kepada kawan-kawan AT13,
Semoga Berjaya dalam peperiksaan semester ini

the chemistry of water

The polarity of water

Water has a simple molecular structure. It is composed of one oxygen atom and two hydrogen atoms. Each hydrogen atom is covalently bonded to the oxygen via a shared pair of electrons. Oxygen also has two unshared pairs of electrons. Thus there are 4 pairs of electrons surrounding the oxygen atom, two pairs involved in covalent bonds with hydrogen, and two unshared pairs on the opposite side of the oxygen atom. Oxygen is an "electronegative" or electron "loving" atom compared with hydrogen.Water is a "polar" molecule, meaning that there is an uneven distribution of electron density. Water has a partial negative charge () near the oxygen  atom due the unshared pairs of electrons, and partial positive charges () near the hydrogen atoms. An electrostatic attraction between the partial positive charge near the hydrogen atoms and the partial negative charge near the oxygen results in the formation of a hydrogen bond as shown in the illustration.

acid and its bases

carbon and its compound

chemical bonding

change of phases of matter