Mixtures+and+Solutions

=   Welcome to Grade 7 Mixtures and Solutions. = = My group is working on trying to find out wich separating method is the best. = =** We are going to be putting information, labs, images, videos, links and questions are going to be on my wikispace. **= =** My group members are pwnagebear and ilovelynx **= = Filtration = How do you think you filter nails in sand? a)your hands b)a cofee filter c)a water filter If you answered a. you are correct if you answered b. or c. you need to be checked. The reason only your hands work is because the sand goes through the cracks of your hand between your fingers. Neither the cofee filter or the water filter can let sand through but neither does the nails. Filtration is a technique used either to remove impurities from an organic solution or to isolate an organic solid. The two types of filtration commonly used in organic chemistry laboratories are gravity filtration and vacuum or suction filtration. Mechanical Filtration removes of solids and physical impurities from the pond or aquarium water by means of sedimentation, settling, or the use of some method of physical straining (media) to achieve clarity to enable you to see your fish. This removal of, say, the visible water pollution will not on its own necessarily provide the best environmental condition for fish. This involves the use of reagents such as activated carbon to adsorb pollutants from the water on one hand, or to change the properties (hardnes/softness, acidity/alkalinity etc) of the water by using the relevant materials. For instance, activated carbon will remove yellow colouration from the water, and zeeolite can be used to reduce hardness. Zeolites, Activated Charcoal, pH Buffers and other commercially available chemicals all have a use in practical fishkeeping but you are advised to 'complete the basics' prior to adding these sophistications to your filter circuit.
 * Mechanical Filtration **
 * Chemical Filtration **


 * Biological Filtration **

Always clean filter media in aquarium or pond water; using tap water will kill off any beneficial bacteria.

How can you separate salt from sand and sawdust, and sand from sawdust?
 * media type="youtube" key="3JlIPnyrZMw?fs=1" height="385" width="480"video on distillation[[image:pwnagebear:image001.jpg width="443" height="337"]]**
 * Question **

Developing a Plan for a Separator 1. Plan an investigation in which you separate a mixture of salt, sand, and sawdust. 2. while planning your activity think about these questions. a) Will you use water? b) Will it take 1 or more steps? c) What substance will be the easiest to separate? What will be the hardest? d) What saftey measures should you take? 3. Make a flow chart showing the steps in separating salt, sand, and sawdust. 4. Explain in a paragraph what happened when the substances were seperated. 5. Use your flow chart to describe the differencees in properties you used.
 * Separating a Mixture of Salt, Sand, and Sawdust **