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# Lesson 8 energy to mix and split

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### Lesson 8 energy to mix and split

1. 1. Energy to mix and split <br />Lesson 8 <br />
2. 2. A mixture contains substances that are mixed together but are not chemically combined. <br />Air is an example of a mixture as it contains a number of different gases including oxygen, carbon dioxide and nitrogen.<br />A solution is a mixture of a solute and a solvent e.g. salt and water. <br />A solute is the substance which is dissolved (salt) and a solvent is a liquid in which a substance dissolves (water). <br />
3. 3. Homogeneous and Heterogeneous Mixture<br />Homogeneous <br />These mixtures are made up of more than one phase or of different parts and can be separated physically. The different components are visibly distinguishable from one another.<br />Ex: A chocolate chip cookie, a piece of quartz containing a vein of gold. granite, oil and water, and a bowl of raisin bran cereal.<br />
4. 4. Heterogeneous <br />Have only one phase, or have a uniform appearance throughout, and any portion of the sample has the same properties and composition. Each region of a sample is identical to all other regions of the sample.<br />Ex: salt water and rubbing alcohol, are considered homogeneous because they are in one phase.<br />
5. 5. Sometimes it is necessary to separate solutions and to do this we have a number of separating techniques including filtration, evaporation, and distillation.<br />
6. 6. Filtration <br />Is the method used for separating an insoluble solid (a solid that will not dissolve) from a liquid. A tea bag is an everyday example of a filter. It works because it has small holes to let the liquid through but blocks the larger pieces of solid.<br />
7. 7. Evaporation <br />Is a method of separating a soluble solid from a solvent e.g. salt and water.<br />
8. 8. Distillation<br />Distillation is a process involving the vaporization of a liquid by boiling it and then condensing the vapor by cooling it. It can be used to purify a liquid (e.g. to obtain pure water from a salt-water solution).<br />