Describing Matter Plasma Physical vs. Chemical Properties A
Describing Matter Plasma Physical vs. Chemical Properties A physical property can be observed or measured without changing the
identity of the matter. Examples: SIZE Color
Shape Density State of Matter (is it solid, liquid, or gas) Some of the less obvious
physical properties are: Solubility the ability to dissolve in another substance (this substance does not have to be water!) Melting point the
temperature at which a substance melts. Boiling point the temperature at which a substance boils.
Malleability- the ability to be compressed or molded into thin sheets or just into another shape. Gold leaf Play Dough
Luster- is it shiny, sparkly, or glossy? Does it reflect light? Ductility- can it be stretched without breaking? Can you draw it into thin wires?
If something is brittle, it just breaks when you stretch it. This is the opposite of
Density, solubility, boiling point, melting point, and freezing point are all CHARACTERISTIC PROPERTIES of a substance. This means no matter how much of the substance you have, the density is the same.
The solubility is the same. The melting and freezing points are the same. CHARACTERISTIC PROPERTIES: Example: The density of 1 ml of water is 1 g/cm3
The density of 100,000 kg of water is still 1 g/cm3 The melting point of water is 0 C It doesnt matter if its one drop of water or a whole bathtub CHARACTERISTIC PROPERTIES
are used to identify unknown substances. Examples: You find a bottle of clear, odorless liquid in the science classroom. You think its probably water but are not sure. So you weigh and
measure it to find that its density is 1.4 g/cm3. Can the liquid really be water? Chemical Properties Chemical properties describe a substance based on its ability to
change into a new substance with different properties. Example: Wood can be burned to create new substances (ash and smoke) with different
properties. Combustibility or Flammability: The ability to catch fire or burn.
Reactivity- does the substance tend to chemically react with other substances? Physical Changes affect the physical properties of a substance. Examples:
Tearing up your paper Crushing a can Freezing water into ice Bending a paper clip Dissolving salt in water Cutting your hair
Chemical Changes affect the chemical properties of a substance. Examples: Your car rusts Burning wood Glow sticks
Baking a cake Food spoils Sodium reacts with water BOOM! Not sure if its a chemical or physical change? Physical changes can often be reversed or undone.
Chemical changes can never be undone without another chemical change. Chemical changes produce NEW substances with NEW properties. Signs of chemical changes:
color change fizzing, foaming, or bubbling temperature change production of light, sound, or odor. A precipitate forms
Physical or Chemical Change? Iron Rusts Physical or Chemical Change?
Sodium Hydroxide dissolves in Water Physical or Chemical Change? A match ignites and burns
Physical or Chemical Change? Icicles form at the edge of a roof Physical or Chemical Change? Milk goes sour
Physical or Chemical Change? A chocolate bar melts in the sun Physical or Chemical Change?
Acid on limestone produces carbon dioxide gas Physical or Chemical Change? Baking soda and vinegar react
Physical or Chemical Change? A tea kettle begins to whistle Physical or Chemical Change? Wood and leaves rot to form humus
Lab Safety Mystery Powders Lab Ms. Rary keeps all her baking supplies in clear plastic containers. Her roommate borrowed her supplies. The roommate used up all of the supplies and replaced them, but she got the containers all mixed up and now Ms. Rary
has no idea what is in each container. There are 5 samples that you will need to examine and test in order to sort.
Evidence-Based Practices for Hereditary Breast and Ovarian Cancer Syndrome and Lynch Syndrome ... And A practice guideline from the American College of Medical Genetics and Genomics and the National Society of Genetic Counselors: referral indications for cancer predisposition assessment ...
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provides the software and a hardware specification for a Network Testbed. Emulab is a long-running project and has through its integration into GENI and its deployment in a number of sites resulted in a number of tools that we will...
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