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7th MidRvw CBB 14-15

7th Grade Midterm Review Chemical Building Blocks Terms 2014-2015

Protons positively charged parts of an atom
electrons negatively charged parts of an atom
neutrons neutrally charged parts of an atom
periodic table a chart which lists all of the known elements
Atom The smallest unit of an element, the building block for all matter
Physical Change The change in a substance that does not change its identity. ex: tearing paper
Volume the amount of space that matter occupies. V=M/D. Units - cm3 or mL
Solution A well-mixed mixture. ex: Kool Aid
Mass a measure of how much matter is in an object. M=DxV. Units - gm
Element a substance that cannot be broken down into other substances by chemical or physical means
Weight the measure of the force of gravity on an object
Compound a substance that is made of two or more elements that are chemically combined
Chemical Change a change in which one or more substances combine or break apart to form new substances
Mixture two or more substances that are mixed, but not chemically combined
Molecule a combination of two or more atoms
Density the measurement of how much mass is contained in a given volume. D=M/V. Units - gm/cm3
Reactivity DECREASES across periods from left to right. Group 1 are MOST reactive. Group 18 are NONreactive
Magnetic properties DECREASE across periods from left to right. METALS are on the LEFT side of the PT, NON METALS are on the RIGHT side of the PT
Group/Family The elements down the columns of the PT; they share similar properties.
Periods The elements across the rows of the PT; their properties change in a predictable pattern.
Created by: bphelan



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