Hukum Kekekalan Massa (Hukum Lavoisier)

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Net Price: $9,459/yr Score: 82.13 See our methodology page for more information about how we calculated this ranking.* *For this ranking, we added an extra feature to the standard methodology. Because we wanted to focus specifically on “speed” rather than general measures of quality, we custom-designed a scale to rank schools based on this highly desirable “fast factor.” Specifically, we researched each online college and asked ourselves the following questions: Does the school offer bachelor’s degrees that one could complete in less than four years? What about associate’s degrees in less than two years? Are there many short certificate options for students who want to quickly augment their skills in an established field? Are there “accelerated” degree paths and options for students who want to earn a combined bachelor’s/master’s degree? Does the school offer credit for life/work experience and past academic coursework in order to help students move ahead on their degree path? 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Hukum Kekekalan Massa (Hukum Lavoisier) Selamat datang di lahiya, situs (blog) sederhana yang berbagi ilmu dan pengetahuan dengan penuh keikhlasan. Dan, pada kesempatan kali ini, kami bakal sharing pengetahuan mengenai Hukum Kekekalan Massa (Hukum Lavoisier). Mudah-mudahan ilmunya bisa berguna untuk kita semua, ya.

Dalam kehidupan sehari-hari kita kerap melihat sebuah proses di mana sebuah benda bakal berubah bentuk dan meterinya saat terjadi reaksi tertentu kepadanya. Seperti kayu yang dibakar serta besi yang berkarat. Lantas setelah ditimbang, nyatanya ada perubahan berat antara sebuah benda sebelum reaksi dengan benda setelah terjadinya reaksi. Pada rekasi pembakaran kayu seolah-olah kayu itu jadi lebih enteng sesudah jadi abu. Begitu juga dengan besi, seolah-olah lebih berat sesudah berkarat. Dari dua contoh itu kita pastinya akan berpikir kalau massa sebuah benda bisa berubah. Tetapi, sesungguhnya tidak demikian. Seorang ilmuan asal Perancis bernama Lavoisier pernah membungkam pemikiran seperti itu dengan penemuannya yang menerangkan bahwa massa sebuah materi akan tetap sama walau apa pun proses yang memengaruhinya. Prinsip ini sekarang di kenal dengan Hukum Kekekalan Massa. Pada kesempatan ini, itulah yang bakal kita bahas tentang pengertian, sejarah penemuan dan aplikasi dari hukum itu.

Malignant peritoneal mesothelioma is a rare type of mesothelioma which attacks the lining of abdomen also known as peritoneum. Malignant peritoneal mesothelioma (MPM) is a universally fatal disease affecting 20% to 30% of the mesothelioma cases. It's was first described by Miller and Wynn in the year 1908. According to the statistics, in the past two decades, the incidence of malignant peritoneal mesothelioma cancer has increased. Peritoneal mesothelioma affects the lining of the abdomen also known as peritoneum. The location of malignant cell is human's abdominal lining and because of that, MPM can sometimes known as abdominal mesothelioma. However, most common term used to describe this type of cancer is peritoneal mesothelioma. The main cause of MPM in humans is asbestos. Asbestos typically is the one of most commonly roofing materials since it is not only cheaper but is easy to fix on a roof. Asbestos exposure contributed to almost 70 to 80 percent of mesothelioma lung cancer. Humans come into contact with asbestos when they swallow or inhale the fibers. Asbestos inhalation may increase risk to develop asbestos related diseases, most importantly mesothelioma. Asbestos was completely banned in UK since it was recognized to be a serious health hazard, and it is now responsible for about 4000 deaths each year and many cases of serious disease. The people at increase risk of developing health asbestos related disease are those whose work brings them into direct contact with asbestos such as builders, heating engineers, roofers and demolition workers. In addition to mesothelioma, asbestos exposure will increase the risk of other health problems such as lung cancer, asbestosis (chronic lung ailment) and other type of cancer such as larynx and kidney cancer. Symptoms of Malignant Peritoneal Mesothelioma It can takes such a long time for cancer to develop the symptoms and sometimes may take up to 30 years, between exposure to asbestos and the start of the disease. Most common symptoms of the disease are abdominal pain, abdominal swelling, abnormal weight loss, anemia, easy fatigue, nausea and vomiting. Abdominal pain and swelling result from fluid accumulation in the abdominal cavity. Other than that, people can easily get fever when the disease starts to shows its symptoms. Among the symptoms stated above, abdominal pain is the most common reported initial symptoms of MPM. Unexplained night sweats and blood coagulation problems are less frequent symptoms occurring when the cancer develops. If the cancer cells spread to the other part of the body, the symptoms may lead to trouble swallowing or swelling of the neck and face. Diagnosis of Abdominal Mesothelioma It is very difficult to diagnose peritoneal mesothelioma since there is no defined system so far that can differentiate the stages of the development of cancerous tumor cells. If required, TNM staging system normally used to detect the cancer in stages. Other than that, Serum mesothelin-related protein (SMRP) may be a potentially useful serum marker used to diagnose and to follow-up the cancer progression. Computer tomography (CT) findings may be a useful tool in detection and characterization of peritoneal mass. Malignant Peritoneal Mesothelioma is a deadly neoplasm. MPM's diagnosis is difficult to perform since the symptoms will take a long time to show up. Early detection is the key in peritoneal mesothelioma treatment since the cancer cell normally spread very fast. Peritoneal Mesothelioma can be regarded as a very dangerous cancer among other cancer.However we can prevent this problems from occur to you and your family. As i said before, early detection is the key of peritoneal mesothelioma treatment [http://peritonealmesotheliomatreatment.com/] success since the cancer cell spread very fast. Get your free update's information about mesothelioma especially mesothelioma treatment by click > mesothelioma [http://mesotheliomatreatmentnews.com/] Article Source: https://EzineArticles.com/expert/Lan_Sipenyair/912820 Article Source: http://EzineArticles.com/6234654

Pengertian Hukum Kekekalan Massa

Hukum kekekalan massa ditemukan oleh seorang pakar kimia Perancis bernama Antoine Laurent Lavoisier (1743-1794) pada tahun 1785. Tetapi, Lavoisier bukanlah yang pertama menyampaikan teori ini. Sebelumnya, ada seorang ilmuan Rusia yang sempat juga mempublikasikan teori ini bersama pembuktiannya pada tahun 1748. Nama ilmuan itu yaitu Mikhail Lomonosov (1711-1765). Oleh lantaran penemuan mereka berdua hukum kekekalan massa di kenal sebagai hukum Lomonosov-Lavoisier.

Hukum kekekalan massa ini menjelaskan tentang massa sebuah materi takkan pernah berkurang maupun bertambah. Massanya akan tetap sama sebelum atau sesudah dilakukan reaksi. Seperti yang dikatakan oleh Lavoisier pada tahun 1785 yakni:

“Tidak ada suatupun yang di ciptakan, baik itu dari proses seni atau dari alam semesta sendiri. Dan ini bisa dijadikan konsep umum di mana pada sebuah proses terdapat kuantitas yang sama dari materi sebelum dan setelah proses itu. Kwalitas dan kuantitas unsur tetap sama, yang terjadi cuma perubahan atau modifikasi. Hal semacam ini berlaku untuk semua rekasi kimia, semua reaksi harus mengasumsikan kesetaraan antara unsur dari sebuah zat yang direaksikan. ”

Dari apa yang dikatakan di atas, jelas bahwa sebuah materi itu cuma dapat dirubah bentuknya namun tidak dapat di ciptakan maupun dimusnahkan. Artinya, selama perubahan bentuk atau bereaksi tidak ada atom-atom pereaksi serta hasil reaksinya yang hilang. Seperti contoh pada kasus kayu yang terbakar, terjadi perubahan bentuk zat yakni dari awalnya berbentuk kayu kemudian jadi abu. Sebenarna selain berubah jadi abu, ada perubahan bentuk yang lain yang terjadi. Ada beberapa zat berpindah tempat lantaran reaksi terjadi pada wadah yang terbuka. Beberapa zat itu seperti karbon dioksida, asap serta uap air. Jika bisa dijumlahkan massanya massa abu ditambah karbon dioksida, asap serta uap air akan sama dengan massa kayu sebelum dibakar. Hukum kekekalan massa bisa dibuktikan apabila dilakukan dalam wadah tertutup yang bisa mencegah adanya sebuah rekasi yang keluar dari wadah. Hingga massanya tetap terjaga.

Sejarah Penemuan Hukum Kekekalan Massa

Pada jaman alkimia yakni sebelum kimia modern lahir, ada satu teori yang tentunya tidak masuk akal dalam dunia kimia saat ini yang menyebutkan bila air pada bejana gelas dipanaskan terus-terusan bakal terjadi residu/endapan dalam bejana itu. Hal semacam itu bisa disimpulkan kalau air sudah berubah jadi tanah lantaran proses pemanasan oleh api. Kemuidian pada masa-masa awal adanya pengetahuan kimia, berkembang juga sebuah pemahaman baru mengenai karakter suatu zat atau materi. Para Ilmuan masa itu berpaham bahwa sebuah zat dapat hilang diakibatkat oleh proses tertentu. Paham ini disimpulkan oleh pakar kimia Jerman, Becher serta Sthal yang menyebutkan kalau pada tiap benda yang bisa terbakar memiliki kandungan zat flogioston. Di mana, zat ini akan terlepas ke udara apabila terbakar hingga massa benda setelah terbakar akan jadi lebih ringan. Pembakaran logam serta peleburan bijih logam dengan batubara bisa diterangkan dengan teori ini. Tetapi, tidak semua kimiawan setuju dengan pemahaman ini meskipun teori ini adalah konsep pemersatu sebelum diakuinya hukum kekekalan massa Lavoisier.

Antoine Laurent Lavoisier, ilmuan perancis menyangkal teori flogioston lantaran ada kejanggalan dalam penerapannya dalam segi yang lebih luas. Lavoisier menyanggah adanya penemuan zat flogioston yang cuma merupakan imajinasi dari pemikir dulu. Untuk membuktikan gagasannya, Lavoisier mendemonstrasikan uji cobanya bahwa pada proses pembakaran, nyatanya ada proses pengikatan oksigen oleh zat yang dibakar. Dalam uji cobanya, beliau memanaskan raksa dalam tabung yang dikaitkan dengan tabung berisi udara. Nyatanya raksa yang dipanaskan berubah jadi zat padat (oksida raksa) yang massanya lebih besar dari massa raksa awal. namun pertambahan massa pada senyawa yang terbentuk diikuti juga dengan pengurangan massa di udara. Dalam hal ini diindikasikan kalau adanya zat dalam udara yang memengaruhi pembakaran raksa.

Percobaan lainnya yang pernah dilakukan Lavoisier yakni dengan memanaskan air dalam sebuah bejana. Air dan bejana yang bakal dipanaskan ditimbang terlebih dulu untuk mengetahui perbedaannya sesudah pemanasan. Proses pemanasan dilakukan selama 100 hari. Sesudah pemanasan ia menimbang air serta bejana yang ternyata beratnya sama dengan saat sebelum dilakukan pemanasan. Hal semacam ini jadi tolak ukur bahwa tidak ada sesuatu dari api yang memengaruhi massa materi. Meskipun massa keseluruhannya tetap sama, tetapi ada sedikit ketidaksamaan antara berat bejana sesudah pemanasan dengan sebelum pemanasan. Berat bejana sesudah pemanasan menyusut, namun berat air bersama residu bertambah. Pertambahan air bersama residu sama dengan pengurangan berat bejana.

Percobaan Lavoisier berikutnya yakni dengan pengujian memakai timah putih. Timah dimasukkan kedalam satu tabung yang sudah ditimbang terlebih dulu. Lantas tabung ditutup dengan rapat serta dipanaskan sampai timah berubah seperti kapur. Sesudah dingin, tabung serta isinya ditimbang. Dan hasilnya sama dengan dua percobaan di atas di mana berat keseluruhannya tidak berubah. Lantas tabung di buka dan terdengar suara udara yang mulai masuk ke dalamnya. Kemudian tabung ditimbang kembali dan beratnya bertambah. Pertambahannya berat tabung serta isinya dengan pertambahan berat timah bernilai sama. Kenyataan ini memperlihatkan bahwa pengapuran yaitu perpindahan udara dalam timah.

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