Assignment 3: Mixtures, Compounds, Elements, Ionic and Covalent Bonds

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Assignment 3: Mixtures, Compounds, Elements, Ionic and Covalent Bonds
By: Karen Owens
November 17, 2012
SCI 110
Professor Lawrance Mullen

1. Describe the difference between a mixture and a compound.
The difference between a mixture and a compound is that a mixture is a substance made by mixing other substances together. Most of the time two or more substances that are chemically united and they do not exist in fixed proportions of each other. Unlike a compound a mixture can be physically separated into pure compounds or elements. For example a cake is made up of different substances that are mixed together that are separated.
A compound on the other hand is just the opposite of a mixture. A compound has a constant composition with fixed ratio of elements. It can have properties different from its constituents as a new substance is formed when they are chemically combined. The difference is that a compound can only be separated by chemical methods. That is like taking platinum and gold and melting them both down together. You get platinum gold which is a mixture of two elements combined together. 2. Suppose that you have a pure substance. How can you tell whether it is a compound or an element?
You can tell the difference because a compound is a mixture of two or more elements. An element on the other hand is a single thing. It is actually divided into pure substances and mixtures. When we have two or more things that are not chemically combined that is called a mixture. They can be divided into homogeneous, like the particles that are throughout milk or heterogeneous, in which we can tell it is mixed like sand and salt.
A pure substance on the other hand is when something is chemically combined and can be divided into compounds made up of elements, like water (H2O). For elements we have basic substances that are used, for example gold which is Au…...

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