Langsung ke konten utama

What Is Chemistry

Chemistry can be defined as the science that deals with the materials of the universe and the changes that these materials undergo.
Chemusts are involved in activities as diverse as examining the fundamental particles of matter, looking for molecules in space, making new materials of all types, using bacteria to produce such chemicals as insulin, ans finding new metods for early detection of desease.
Chemistry is often called the central science-and with good reason. Most of the phenomena that occur in the world around us involve chemical changes-changes in which one or more substances become different substance. Here are some examples of chemical changes:

  • Wood burns in air, forming water, carbon dioxide, and other substances.
  • A plant grows by assembling simple substances into more complex substances.
  • The steel in a car rusts.
  • Eggs, flour, sugar, and baking poeder are mixed and baked to yield a cake.
  • The definition of the term chemistry is learned and stored in the brain.
  • Emissions from a power plant lead to the formation of acid rain.

Komentar

Postingan populer dari blog ini

Rossa

Full name is Rossa Roslaina Sri Handayani, nick nsme is Rossa. Rossa is a singer in Indonesia. Rossa was born in 1978 Oktober 9 in Sumedang, West Java. Rossa is the first daughter of Mr Ukas Hermawan and Mrs Eni Kusmiani. Rossa be came a singer since 1988. Rossa is bright yellow skined. She is short an slender. She is 31 years old. Rossa has wavy, long black hair, a pointed nose. Her face is round. Rosssa married with yoyo at 2004 Meret 18. 2005 Oktober 3, Rossa to give birth to boy cildren name is Risky Langit Ramadhan. But they to part at 2009 July 14. She to able to appreciation many enaugh. Finally Rossa to become, the woman singer solo pop the best AMI Award 2008 past hist "Ayat-ayat Cinta". Her hobbies are singing and to dance. Rossa has a beautiful voice and Rossa has a beautiful.

How the Other Half Lives

Lord Manners was a rich and famous banker. When he died, he was given a magnificent funeral which was attended by hundreds of famous people. The funeral was going to be held in Westminster Abbey. Many ordinary people lined the streets to watch the procession. The wonderful black and gold carriage was drawn by six black horses. The mourners followed in silence. Lord Manners was given a royal farewell. Two tramps were among the crowd. They watched the procession with amazement. As solemn music could be heard in the distance, one of them turned to the other and whisper in admiration, "Now that's what I call really living!"

Don't Call Us, We'll Call You

Two years ago I moved to a new neighbourhood. There seem to be very few people in this area who are without telephones, so I expected to get a new phone quickly. I applied for one as soon as I moved into my new house. "We aren't supplying many new phones in your area," an engineer told me.     "A lot of people want new phones at the moment and the company is employing fewer engineers than last year so as to save money. A new phone won't cost you mush money, but it will take a little time. We can't do anything for you before December." You nees a lot of patience if you're waiting for a new phone and you need a few friends whose phones you can use as well. Fortunately, I had both. December came and went, but there was no sign of a phone. I went to the company's local to protest. "They told me I'd have a phone by December," I protested. "Which year?" the assistant asked.