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Burning of magnesium metal

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Introduction

Elements are pure substances where all the atoms are same type. Chemical reactions join or split atoms to rearrange them. But they cannot change one element into another element, or anything simpler. Each element has a special name. For example carbon, oxygen and hydrogen, magnesium is all elements. Compounds are pure substances made by two or more elements join together by chemical bonds. This means that compounds will always exist as molecules, not separate atoms. For example when oxygen reacts with magnesium it formed a compound called magnesium oxide, MgO. Mixture is made from different substances that are not chemically joined together. For example powdered iron and powdered sulphur mixed together makes a mixture of iron and sulphur. They can be separated from each other without a chemical reaction For example air, sea water, and most rocks e.t.c. can be separated using chemical reaction. Most elements are metals reather than non-metals. ...read more.

Middle

I can't see air (oxygen) because it's gas at room temperature. Here is a diagram of magnesium and oxygen- During the reaction Magnesium burns very brightly when heated in air. Some metals are very reactive. They easily take part in chemical reactions to make new substances. Magnesium is like this. It is heated in a Bunsen burner; it ignites and burns with a brilliant white flame. By the action of fire, the magnesium reacts with the oxygen in the air and form magnesium oxide. Description after When two elements react together to form a compound, the compound is different to either of the two elements both of appearance and in physical properties. So the magnesium has gone grey powder. The oxygen reacted with magnesium and made it very light and dull. All substances have mass and therefore must be composed of atoms. These atoms and how they assemble themselves in the substance determines their chemical and physical properties. ...read more.

Conclusion

If a chemical process such as combustion or oxidation breaks the substance down to its constituent atoms then the substance is a "compound"(e.g., salt, sugar, water). Otherwise the substance is an "element" (e.g., copper penny, aluminium foil). Compounds are made up of molecules or salts. Elements are made up of single types of atoms. There are 9 types of energy. They are kinetic; heat, light, gravitational potential, chemical, sound, electrical, nuclear and elastic potential energy. Energy can't be created or destroyed. It can only transform to another form. In magnesium there was stored energy which is chemical energy. When it's got heat it produced a white flame so chemical energy turned into light energy. When it's got burn and the magnesium turned into grey powder the light energy transform into thermal (heat) energy. In a chemical reaction there is always the same number of particle before and after a reaction. Therefore, there is the same mass. This is called the conversation of mass. The particle in a chemical reaction doesn't destroy or increase; it's just rearrange to form a new substance. ...read more.

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