CHEMISTRY IS THE STUDY OF MATTER ANDTHE CHANGES IT UNDERGOES. THESE CHANGES OCCUR WHEN THE ATOMS OF A SUBSTANCE ARE REARRANGED TOMAKE A NEW SUBSTANCE. THIS IS CLASSIFIED AS A CHEMICAL REACTION. BUT BEFORE YOU GET INTO A CHEMICAL REACTION YOU MUST LEARN ABOUT WHAT MAKES UP A CHEMICAL SUBSTANCE. mATTER IS VERY IMPORTANT IN THE SUBJECT OF CHEMISTRY. MATTER IS ANYTHING THAT TAKES UP SPACE. MATTER CANNOT BE CREATED NOR DESTROYED PHISICALLY OR CHEMICALLY. ANOTHER CRITICAL OBJECT IN HEMISRTY ID THE ATOM. THE ATOM WAS DISCOVEREC MY A GREEK PHILOSOPHER NAMED DEMOCRATIS. DURING HIS TIME DEMOCRATIS DID NOT PUBLICALLY ANNOUNCE HIS THEORY OF THE ATOM. iN HIS THEORY KNOWN AS THE ATOMIC THEORY IT SAID THAT ATOMS ARE INDIVISIBLE AND ARE THE SMALLEST PARTICLES OF MATTER . lATER ON IN CHEMISTRY HISTORY A ENGLISH SCIENTIST BY THE NAME OF pROUST, SAID THAT THE ATOM CAN BE DIVIDED INTO EVEN SMALLER PARTS. THESE PART ARE NOW KNOWN AS THE PROTON, ELECTRON AND THE NUETRON.

There are many different chemical reactions . some include decay , fermentation, the hardening of cement and the tarnish of silver and the digestion of food. there is also decomposition chemical reactions. These reactions happen when a hemical substance breaks down into simpler parts. to see this type of chemical reaction we need to have heat energy. There are also many factors involved in a chemial reaction. they are temperature . the amount of reatant and pressure. In a chemical reaction when temperature inreases the rate of reaction time also increases. this is a diret proportion. Usually reactions come in large amounts at the highest recorded temperature. when there is a rise in temperature molecules collide more often .

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