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Chemical Analysis

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Pure substances vs mixtures.

A pure substance cannot be separated by physical means such as filtration, evaporation, distillation or chromatography.
A mixture is a combination of two or more elements or compounds that are not chemically combined.

Posted by Visual science
Posted by Visual science
Filtration separation method

This is a more common method of separating an insoluble solid from a liquid. An example
of such a mixture is sand and water. Filtration is used in water treatment plants, where
water from the river is filtered to remove solid particles.

http://www.eschooltoday.com/science/elements-mixtures-compounds/what-is-filtration-method-of-separation.html

Posted by Visual science
Posted by Visual science
Posted by Visual science
Posted by Visual science
Posted by Visual science
Steps for Balancing Chemical Equations

1. Identify each element found in the equation. The number of atoms of each type of atom must be the same on each side of the equation once it has been balanced.

2. What is the net charge on each side of the equation? The net charge must be the same on each side of the equation once it has been balanced.

3. If possible, start with an element found in one compound on each side of the equation. Change the coefficients (the numbers in front of the compound or molecule) so that the number of atoms of the element is the same on each side of the equation. Remember! To balance an equation, you change the coefficients, not the subscripts in the formulas.

4. Once you have balanced one element, do the same thing with another element. Proceed until all elements have been balanced. It's easiest to leave elements found in pure form for last.

5. Check your work to make certain the charge on both sides of the equation is also balanced.

http://chemistry.about.com/od/chemistryquickreview/a/balanceequation.htm

Posted by Visual science
Posted by Visual science