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# Identification of Matter

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Identification of Matter
Unit 1 Physical Science HS Credit Mrs. Rubel

The Properties of Matter
We know that matter is what makes up an object, but how do we describe this matter? If you know the properties of an object, then you may be able to identify it.

Physical Properties The Physical Property of matter can be observed or measured. For example, color, mass, volume, taste, smell, etc. You use physical properties all the time to make decisions (ex: what clothes to wear).

Density: A Physical Property
You know the formula for density, which involves the volume divided into the mass: Mass M D V Density = Volume or You can use density to identify a substance.

Using the Physical Property of Density
There are two (2) ways that density can help identify an object: The density of a particular substance is always the same at a given pressure and temperature. Ex: copper. Solid copper at 20oC and normal atmospheric pressure will always have a density of 8.96 g/cm3

Using the Physical Property of Density
2) The density of one substance is usually different than the density of another substance (when it is at the same temperature and atmospheric pressure).

The Physical Property of Density
So, why is it important to know that density can be used to identify specific objects? The example learned the hard way: Pyrite (Fool’s Gold) What do you think happened when people found pryrite? How did they prove it was pyrite?

Displacement You know that you can find the volume of a solid (length x width x height, which is 3, and liquid, which is in mL, L). How do you get the volume of an irregular shaped object? Find the volume of a certain amount of water. Add the object to the water. Subtract the measurement of the water from the object and water together.

Chemical Properties Chemical properties describe a substance based on it’s ability to change into a new substance with different properties. Examples: burning, baking, digestion, photosynthesis , etc. You change object into a different substance (different chemical make-up).

Physical vs. Chemical Properties
Physical properties can change, but the substance doesn’t change (i.e., ice tea). You can separate the properties that make up the substance. Chemical properties can completely change the original substance (i.e., salt, rust) You can’t undo chemical changes unless you have another chemical change.

Characteristics of Physical Change
CHANGES IN SIZE AND/OR SHAPE CHANGES IN STATE (SOLID, LUQUID, GAS) CHANGES IN COLOR (NO CHEMICALS INVOLVED)

Characteristics of Chemical Changes
Could be use of heat To make new substances Can only be Undone by Another Chemical Change New Substances with Different properties Involves a Chemical reaction

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