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chem unit 2 review

TermDefinition
Matter Anything that has mass and occupies space
atom particle of matter that uniquely defines a chemical element
element a substance that can't be broken down by non-nuclear reactions
molecule 2 or more atoms connected by chemical bonds which form the smallest unit of a substance that retains the composition and properties of that substance
pure substance single kind of matter that can't be separated into other kinds of matter by any physical means
compound substance made up of 2 or more different chemical elements combined in a fixed ratio
ionic compound chemical compound composed of ions held together by electrostatic forces termed ionic bonding
covalent compound a compound whose atoms are bonded via a covalent bond
physical property property of matter that doesn't deal with chemical changes
chemical property any of a material's properties that become evident during a chemical reaction
corrosiveness ability for a substance to destroy and damage other substances with which it comes into contact
reactivity the rate at which a chemical substance tends to undergo a chemical reaction
flammability how easily something will burn or ignite, causing fire or combustion
physical changes changes affecting form of a chemical substance but not chemical composition
chemical changes occur when a substance combines with another to form a new substance
4 pieces of evidence of a chemical change color changes, formation of a solid in a previously clear solution, formation of gas, heat absorption or emission and light emission
heterogeneous mixture have visually distinguishable components
homogeneous mixture same proportion of it components through the given sample
law of definite proportions regardless the amount, a compound is always composed of the same elements of same proportion by mass
law of conservation of mass mass is neither created nor destroyed during chemical or physical reactions
% by mass mass of an element --------------------------- x100 total mass of the compound
Created by: auweb921
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