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26 Cards in this Set
- Front
- Back
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LIST SOME CHARCTERISTICS OF METALS.
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1- MOST SOLID AT ROOM TEMP.
2- malleable 3- ductile 4- conduct heat & electricty 5- very high melting point 6- metallic luster 7- metals only react to nonmetals |
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LIST SOME CHARCTERISTICS OF nonmetals.
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1- gas or solid at room temp
2- not malabale 3-4not ductile,not conductive 5-6 density/ melting pointlow 7- reacts w/ both metals & nonmetals |
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semimetals/ metalloids
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a few elements have properties between those of the metals and nonmetals
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1-atm
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normal pressure
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35*c/77
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normal room temp
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atomic number
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indicates number of protons in each atam
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physical state of Hg
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metal
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physical state of Br
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nonmetal
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Density formula
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D = m/V.
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Density
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Density measures the compactness of matter. The more compact the bigger the density value is.
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law of composition
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A COMPOUND ALWAYS HAS THE SAME ELEMENTS IN THE SAME PROPORTIONS BY MASS...(WATER)
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MOLECULE
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single particle composed of 2 or more nonmetal atoms
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melting point of water
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0*c
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physical property
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those characteristics of a pure substance that we can observe with out changing the composition of the substance
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A chemical property of a pure substance describes its....
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chemical reactions with other substances.
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in a _________ the chemical composition of the sample does not change
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physical change
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in a chemical change, what happens to the compisition of the sample?
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the composition of the sample changes & we observe a new set of properties.
( antacid tablet in water) |
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define the law of conservation of mass...
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matter is neither created nor destroyed
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define the law of definite composition....
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compounds always contain the same elements in a constant proportion by mass....H2o, Nacl
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give examples of what a physical property refers to
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characteristics such as color,density,melting point,conductivity of heat & electricty,solubility & physical state
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melting point of water
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0*C
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single particle composed of two or more nonmetal atoms
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MOLECULE
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THE ABILITY TO DO WORK.....
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energy
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what is the difference between potential energy & kinetic energy...
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PE of a substance is related to it's chemical compisition, whereas the KE of a substance is related to the motion of its particals.
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when we heat a substance what happens to its kinetic energy?
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it increases
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list 6 forms of energy
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1- heat
2- light 3- chemical 4- electrical 5- mechanical 6- nuclear |
