Chemistry Exam 1

Chemistry Exam 1 - Chemistry Exam 1 Atom - smallest unit of...

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Chemistry Exam 1 Atom - smallest unit of an element that can exist alone Ex. Molecule – a combination of a fixed number of atoms held together in a particular spatial arrangement Ex. H20 Ion – Electrically charged species that carries current when dissolved in an aqueous solution Ex. Na + Compound - a pure substance made up of two or more elements in a fixed characteristic chemical combination Ex. Water is a compound of oxygen and hydrogen Mixture – physical combination of two or more substances present in variable amounts Ex. The air we breathe Heterogeneous / Homogeneous – refer to the uniformity of a mixture. Homogeneous mixtures are uniform in appearance. Example: salt water. Heterogeneous mixtures consist of many different items, which are often not easily sorted or separated, though they are clearly distinct. Ex. Salad Element – Purest / simplest substance Ex. Ca – Calcium Ionic Bond – a neutral bond between a metal and a nonmetal Ex. CaCl2 – Calcium chloride Covalent Bond – a neutral bond between two nonmetals
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This essay was uploaded on 04/06/2008 for the course CH 100q taught by Professor Who during the Spring '08 term at N.C. State.

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Chemistry Exam 1 - Chemistry Exam 1 Atom - smallest unit of...

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