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Definition
| The total mass remains constant during a chemical change or a chemical reaction. |
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| Example of Law of Conservation |
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Definition
| When you burn a piece of paper the paper turns into ash, carbon dioxide, and water vapor. However the mass of those combined elements would equal the mass of the original paper. |
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| Chemical Reaction that shows the Law of Conservation |
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Definition
| Mercury + Oxygen = mercury(II) oxide |
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The form of matter characterized by rigidity; relatively incompressible; has a fixed shape and volume.
Ex. A Chair |
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The form of matter that is a relatively incompressible fluid; has a fixed volume but no fixed shape.
Ex. Water |
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The form of matter that is easily compressible fluid; has no fixed volume or shape.
Ex. Oxygen |
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Characteristic that can be observed for a material without changing its chemical identity.
Ex. Color, melting point, density |
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Characteristic of a material involving it's chemical change.
Ex. ability to rust, flammability, toxicity |
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Change in the form of matter but not in its chemical identity.
Ex. Dissolving salt into water, melting ice into water |
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Change in which one or more kinds off matter are transformed into new matter or several new kinds of matter.
Ex. Rusting iron, burning of magnesium |
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A material that has constant composition and has consistent properties throughout the sample. |
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| Material with more than one element in it. |
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Substance that cannot be decomposed by any chemical reaction into simpler substances.
Ex. Iron, Hydrogen, Oxygen |
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A substance composed of two or more elements chemically combined.
Ex. Carbon dioxide, copper(II) oxide, glucose |
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| Material that can be separated by physical means into two or more substances. |
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| A mixture that consists of physically distinct parts, each with different properties. |
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| A mixture that is uniform in its properties throughout given samples. |
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Properties that do not depend on the amount of material present.
Ex. Density, Boiling Point |
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Properties that do depend on the amount of matter present.
Ex. Mass, Volume, Size |
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| Similar separation techniques that depend on how fast a substance moves in a stream of gas or liquid past a stationary phase to which the substance may be slightly attached. |
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| An ink line is drawn near the bottom of a strip of paper and placed in methanol and water. The solution moves up the paper, dragging the ink with it. The ink separates into different colored bands that each represent a different dye. When the solution moves up, the strong attracted dyes do not go up as high as the less strongly attracted dyes. |
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Definition
| The substances that need to be separated are poured into the top of a column filled with powdered chalk. Then pure liquid is added to the column and the substances separate into bands. The substances separate all the way down the column and then are collected in a flask when they reach the end. |
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Definition
| Vaporized substances plus a gas pass through a column of a stationary material and are attracted differently to the stationary column. The stationary material is either a solid of a liquid attached to a solid. |
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| Application of Column Chromatography |
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Definition
| Leaf pigments can be dissolved and then poured into the column with powdered chalk. Then a pure liquid is poured into it and the pigments separate. |
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