Banyak siswa yang mengeluhkan materi stokiometri saat akan menghadapi ujian, saat mereka mempelajari materi tersebut seakan-akan telah menguasainya tetapi saat dihadapkan dengan soal ujian materi tersebut kok jadi gag bisa ya? hal ini karena materi ini disampaikan pada akhir semester satu di kelas 1 SMA dan karena materinya banyak (maksudnya sebenarnya perlu banyak latihan soal2nya....) kadang2 hanya disampaikan separuh dan separuhnya lagi disampaikan saat semester dua.
sekilas materi stokiometri ini sudah dibahas dalam 2 semester sehingga menjadikan siswa lebih paham, namun karena sebenarnya penyampaian materi pada akhir semester satu saat pertemuan kelas tinggal sedikitl agi dan dikejar deadline ujian akhir semester menjadikan materi ini biasanya disampaikan secara cepat dan saat semester dua lanjutannyapun dibahas secara cepat karena ingin cepat2 ganti materi lain yang memang baru disampaikan pada semester dua tetapi tertunda dengan penyampaian materi stokiometri...........
sebenarnya inti dari materi stokiometri tidaklah terlalu banyak namun yang diperlukan disini adalah memperbanyak latihan soal sehingga menjadi lebih paham. secara singkat materi stokiometri terdiri dari :
A. KONSEP MOL
1. Mol = gram
Ar atau Mr
2. Mol = jumlah partikel
6,02 x 1023
Jumlah partikel = molekul/ion/atom
3. Mol = volume
22,4 L (dalam keadaan STP)
bila tidak dalam keadaan STP (00C,1 atm)
Mol 1 = volume 1
Mol 2 volume 2
4. Mol = M x V
M = Mol
V
M = konsentrasi (M)
V = volume (L)
Langkah-langkah perhitungan :
Untuk menghubungkan rumus yang satu dengan rumus yang lainnya selalu dirubah dalam bentuk MOL
B. RUMUS KIMIA
1. Rumus Empiris
Rumus empiris adalah rumus yang menyatakan perbandingan terkecil atom-atom yang menyusun suatu senyawa
Langkah-langkah perhitungan :
Perbandingan atom-atom penyusunnya sama dengan perbandingan massa (gr) atau persen massa yang dibagi dengan Ar nya masing-masing
2. Rumus Molekul
Rumus molekul adalah rumus yang menyatakan jumlah atom-atom sebenarnya yang menyusun suatu senyawa
(Mr rumus empiris) x = Mr rumus molekul
X = kelipatan
C. HUKUM PERBANDINGAN TETAP (PROUST)
Hukum perbandingan tetap dalam AxBy :
massa A = x.Ar A
massa B y.Ar B
massa A = x.Ar A
massa AxBy Mr AxBy
%A = x.Ar A x 100%
Mr AxBy
%A = massa A x 100%
massa AxBy
D. PERSAMAAN REAKSI
Koefisien reaksi menyatakan perbandingan mol zat-zat dalam reaksi
Jika mol-mol zat yang direaksikan tidak sebanding, mol zat yang digunakan adalah mol yang jika dibagi dengan koefisiennya hasilnya paling kecil
Reaksi pembakaran senyawa organik :
CxHy + (x + ¼ y) O2 --> x CO2 + ½ y H2O
mol O2 : mol CO2 : mol H2O = (x + ¼ y) : x : ½ y
Pemanasan seny. hidrat(mengandung air)
Senyawa.xH2O --> Senyawa + xH2O
X = mol H2O
mol Senyawa
E. HUKUM GAS
RUMUS : PV = nRT
P = tekanan (atm)
V = volume (L)
n = mol zat
R = 0,0082
T = suhu (0K), x0C = (x + 273)0K
Koefisien reaksi = perbandingan volume
0 
Star
The men's prostate is central to the a part of a male's the reproductive system. It secretes fluids that aid in the transportation and activation of sperm. The prostate gland is situated just in front of the rectum, below the bladder and around the urethra. When there is prostate problem, in most cases really miserable and inconvenient for that patient as his urinary method is directly affected.
The common prostate medical problems are prostate infection, enlarged prostate and prostate cancer.
Prostate infection, also called prostatitis, is among the most common prostate-related problem in men younger than 55 years old. Infections in the prostate gland are classified into four types - acute bacterial prostatitis, chronic bacterial prostatitis, chronic abacterial prostatitis and prosttodynia.
Acute bacterial prostatitis will be the least common of forms of prostate infection. It is caused by bacteria based in the large intestines or urinary tract. Patients may go through fever, chills, body aches, back pains and urination problems. This condition is treated by utilizing antibiotics or non-steroid anti-inflammatory drugs (NSAIDs) to help remedy the swelling.
Chronic bacterial prostatitis is often a condition connected with a particular defect in the gland along with the persistence presence of bacteria inside urinary tract. It can be a result of trauma on the urinary tract or by infections originating from other parts with the body. A patient can experience testicular pain, back pains and urination problems. Although it is uncommon, it could be treated by removal of the prostate defect followed by the employment antibiotics and NSAIDs to deal with the soreness.
Non-bacterial prostatitis is the reason approximately 90% coming from all prostatitis cases; however, researchers have not even to ascertain what causes these conditions. Some researchers believe chronic non-bacterial prostatitis occur due to unknown infectious agents while other believe that intensive exercise and high lifting can cause these infections.
Maintaining a Healthy Prostate
To prevent prostate diseases, a proper meals are important. These are some with the actions to keep your prostate healthy.
1. Drink sufficient water. Proper hydration is important for overall health and it will also keep the urinary track clean.
2. Some studies claim that a number of ejaculations weekly will prevent prostate type of cancer.
3. Eat pork without excess. It has been shown that consuming greater than four meals of beef per week will heighten the likelihood of prostate diseases and cancer.
4. Maintain a proper diet with cereals, vegetable and fruits to make sure sufficient intake of nutrients necessary for prostate health.
The most important measure to take to ensure a healthy prostate would be to choose regular prostate health screening. If you are forty years and above, you ought to choose prostate examination at least one time 12 months.