Unit 2 Honors Chem Vocab Flashcards
Octopus
study of structure and properties of matter as well as changes it undergoes
Chemistry
basic building blocks of matter
atoms
definite composition and contains ONLY one type of matter present. Has set of properties that are always same, regardless of source
pure substance
anything that has volume and mass
Matter
pure substances that contain only 1 type of atom
elements
pure substances that contain more than 1 type of element chemically bonded together
compounds
neutral groups of atoms held together by chemical bonds
molecule
different forms of an element
allotropes
shows arrangement of atoms in a molecule
structural
compounds will always have the same elements in exactly the same ratio by mass
law of definite proportions
shows # and type of bonded atoms
molecular
describe how many atoms of each type are in a compound, or how many atoms are in a molecule
subscripts
describe # of molecules that are present or tells you how many molecules are involved
coefficients
material that contains 2 or more types of atoms/mol. that are NOT chemically bonded
mixture
contains compounds that aren’t mixed evenly in microscopic level so different compounds have different properties
heterogeneous mixture
solutions evenly mixed on microscopic level so all parts of sample have same properties
homogeneous mixture
can be observed without changing the composition of matter
physical property
those can be observed without creating new substance
physical properties
2 or more pure substances physically combined
mixtures
those can only be observed by chemically changing 1 substance into another substance (with new molecular formula)
chemical properties
can be observed only when chemical change occurs
chemical properties
ability to hammer matter into thin sheet
malleability
separation based on density
centrifuge
separation based on attraction between substances
chromotography
