Separation Design Of A Homogeneous Mixture

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MYP Chemistry, Period 4
Marian Walker
September 29, 2016
Separation Design Lab

Criterion A
A.i) A mixture is defined as a combination of two or more substances that are not chemically combined. A mixture that has a uniform composition and uniform properties throughout it is known as a homogeneous mixture. One example of a homogeneous mixture is air. Air is a homogeneous mixture of gases. Another example of a homogeneous mixture can be seen when you mix a spoonful of table salt or sugar into a glass of water because either the sugar or salt dissolves. If you were to mix dirt or sand and water, a heterogeneous mixture will be formed, not a homogeneous one. (Stewart 2014) A heterogeneous mixture is made up of a non-uniform composition. At least two components of a heterogeneous mixture must have clear distinctive differences. For example, if you were to examine a heterogeneous mixture sample, you would be able to see the separate components. Ice cubes in soda form a heterogeneous mixture because there is a clear distinction between the soda and the ice cubes. (Helmenstine) A compound is formed when two or more chemical elements are chemically bound together. A mixture does not involve a chemical reaction to occur but in order to form a compound, one must occur. Two types of chemical bonds are ionic bonds and covalent bonds. Water, hydrogen and oxygen, is an example of a compound. (Stewart 2014)
A.ii) Through the lab our goal was to separate an unknown mixture using
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