Mixtures and Compounds

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Mixtures and Compounds
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SCI-110
9 May 2011

Mixtures and Compounds
Describe the difference between a mixture and a compound. Chemical compounds are in every known object or substance. They are composed of two elements that combine with each other. They can also be more than two elements. Compounds are one of three forms of matter, and the other two are element mixtures. Compounds have a definite composition, as water will always consist of 88.9% oxygen and 11.1% hydrogen. In contrast, the elements that make up a mixture of iron and sulfur are black iron granules and yellow sulfur crystals which are recognizable. By use of a magnet, iron can be removed from the mixture, and sulfur can be dissolved. In addition, iron and sulfur can be mixed together by just stirring them together (Clarified, 2011).
Suppose that you have a pure substance. How can you tell whether it is a compound or an element? A pure substance is an element that cannot be broken down by chemical techniques, like heating, cooling, or reactions from chemicals. This type of pure substance has only one atom, like copper, gold or silver. A large chunk of gold will have millions of gold atoms, and no other atom exist in it. Take for example if you were to heat up copper to the point you melted it, the smallest unit of copper, called an atom is still copper, regardless if it is a solid, liquid, or gaseous state. The atom is the smallest subdivision of an element, but it will maintain the property of the pure substance (Clarified, 2011).
What is the difference between an ionic and a covalent bond? Two ions with opposing charges is an ionic bond, they attract each other and stay together, which happens when atoms gains or loses electrons. Covalent bonding on the other hand share electrons when two atoms come together, where covalent bonds have a definite…...

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