Week 6 - Physical Properties Flashcards
Why are drag car standards constantly reinforced?
Drag racing is a highly competitive (and expensive) sport. There are a variety of classes of vehicles, ranging from
stock classes (depending on car weight, engine size, and degree of engine modification) all the way up to the Top
Fuel class with weights of over two thousand pounds and capable of top speeds of well over 300 miles per hour at
the end of the quarter-mile. The standards for each class are well defined and frequent checks are made of engine
dimensions and components to ensure that the rules are followed
s a characteristic of a substance that can be observed or measured without changing the
identity of the substance
Physical Properties
Silver is a shiny metal that conducts electricity very well. It can be molded into thin
sheets, a property called malleability. Salt is dull and brittle and conducts electricity when it has been dissolved
into water, which it does quite easily
Physical Properties
Physical properties of matter include color, hardness, malleability, solubility,
electrical conductivity, density, melting points, and boiling points.
Physical Properties
For the elements, color does not vary much from one element to the next. The vast majority of elements are colorless,
silver, or gray. Some elements do have distinctive colors: sulfur and chlorine are yellow, copper is (of course) coppercolored, and elemental bromine is red.
Read
can be a very useful parameter for identifying an element. Of the materials that exist as solids at room
temperature, iodine has a very low density compared to zinc, chromium, and tin. Gold has a very high density, as
does platinum.
Density
helps determine how an element (especially a metal) might be used. Many elements are fairly soft (silver
and gold, for example) while others (such as titanium, tungsten, and chromium) are much harder. Carbon is an
interesting example of hardness. In graphite (the “lead” found in pencils) the carbon is very soft, while the carbon
in a diamond is roughly seven times as hard.
Hardness
Melting and boiling points are somewhat unique identifiers, especially of compounds. In addition to giving some
idea as to the identity of the compound, important information can be obtained about the purity of the material.
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characteristic of a substance that can be observed or measured without changing the
identity of the substance.
Physical Science
include color, density, hardness, and melting and boiling points
Physical Properties
The temperature which causes liquid to boil.
Boiling point
The concentration of a substance. Increases as its temperature decreases
Density
Helps determine how an element (especially a metal) might be used
Hardness
The temperature which causes solids to melt.
Melting point
A characteristic of a substance that can be observed or measured without changing the
identity of the substance.
physical property
