# Density Review and Classification of Matter. Density Density = Mass Volume Unit: g/ml

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A student is taking measurements on a rock that he found. Its mass was 15g, and he volume was 3ml. What was the rock’s density?

### Text of Density Review and Classification of Matter. Density Density = Mass Volume Unit: g/ml

Slide 1Density
Unit: g/ml
A student is taking measurements on a rock that he found. Its mass was 15g, and he volume was 3ml. What was the rock’s density?
What is the volume of an object if the density is 10g/ml, and it’s mass is 30g?
What is the mass of an object if the volume is 10ml, and the density is 4g/ml?
Matter
Solid
Plasma
Gas
Liquid
Cannot be broken down into simpler
All one kind of atom.
Compounds are substances that can be broken down by chemical methods
When they are broken down, the pieces have completely different properties than the compound.
Made of molecules- two or more atoms
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Mixtures
Heterogeneous- mixture is not the same from place to place.
Homogeneous- same composition throughout.
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Solutions
Solid in liquid- Kool-aid
Liquid in liquid- antifreeze
Gas in gas- air
Solid in solid - brass
Like all mixtures, they keep the properties of the components.
Can be separated by physical means
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EXPLAIN: http://www.csudh.edu/oliver/demos/foldfilt/hhfldflt.htm
Folding a piece of filter paper for insertion into a conical filter consists of a simple set of steps, shown here in the six photographs below. From left to right and top to bottom, one first folds the round piece of filter paper in half and creases it. Then, it is folded again and creased to produce a quarter circle. One outer layer of paper is separated from the other three (not two and two!), and the opening should be made wider by squeezing slightly together at the creases. The conical shaped piece of filter paper is placed into a glass or plastic funnel and wetted slightly with distilled water from a wash bottle.
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Image source: http://www.magnetsource.com/Solutions_Pages/sepmags.html
Drop-in magnetic separator filters, designed for fluid tanks and reservoirs, pull fine particles out of fluids and hold them until the unit can be cleaned and dropped back in. Used in tanks or other containers having low to moderate flows.
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Decantation
EXPLAIN
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Image source:
http://en.wikipedia.org/wiki/Thin_layer_chromatography
EXPLAIN: Chromatography is an important analysis tool used in industry and in medicine. Chromatography is used to detect, separate, or purify different substances. Using this process food, drugs, blood, soil, water, air, fuel, and petroleum, and radioactive-fission products are analyzed. In medicine, chromatography can determine the presence of drugs in a person's blood. In water and air quality analysis, chromatography is used to isolate pollutants.
Chromatography of many kinds is widely used throughout the chemical industry. Environmental testing laboratories look for trace quantities of contaminants, such as PCBs in waste oil, and pesticides, such as DDT in groundwater. The Environmental Protection Agency uses chromatography to test drinking water and monitor air quality. Pharmaceutical companies use chromatography both to prepare large quantities of extremely pure materials and also to analyze the purified compounds for trace contaminants.
Chromatography is used for quality control in the food industry, by separating and analyzing additives, vitamins, preservatives, proteins, and amino acids. It can also separate and detect contaminants such as aflatoxin, a cancer-causing chemical produced by a mold on peanuts. Chromatography can be used for purposes as varied as finding drug compounds in urine or other body fluids, to looking for traces of flammable chemicals in burned material from possible arson sites.
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Centrifuge

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